Louisiana Flavored Natural History from the Edge of the D’Arbonne Swamp (with Books as Lagniappe)__________________________________
Bayou-Diversity (13 September 2017) VINES As a child I was amazed by the Tarzan movies. I could never figure how the Lord of the Jungle always had a convenient vine from which to swing out of danger or into the arms of Jane. Also, in defiance of all probabilities, when Tarzan reached the apex of a swing only to alight gracefully on a massive limb, there was always another vine ready to carrying him on his arboreal way.
Vines can be broadly defined as any climbing plant. Their ability to climb is an adaptive feature that allows them to monopolize sunlight by using other plants as support structures. By climbing or creeping along the ground vines can also keep their roots in favorable soil and grow out over poor soil or rock surfaces where other plants can’t grow in order to reach more sunlight with little competition.
Vines can be found in several different plant families using different techniques to climb. Only a few, like morning glories, resemble the typical artists’ renditions of plants twining their stems around a support. Some, like poison ivy, have clinging roots to work their way up a tree. Others have tendrils, which can be specialized shoots as in muscadines and other grapes, or even modified flowers as in passion flowers. Virginia creeper has twining stems with adhesive pads that firmly attaches the vines to a support.
Vines are a natural part of many ecosystems. Many species of birds and other animals use vines as a food source – think grapes, and greenbrier and rattan berries – and places to build their nests. Some vines can live to a very old age and biologists use the presence or absence of large, old vines as an indicator of the ecological health of a tract of forest. With the exception of deep overflow swamps, most forests in north Louisiana once contained many large vines. Their scarcity now is a result of intensive logging.
Unfortunately, when non-native vines are introduced into a new area they can become an invasive species to the detriment of native flora and fauna. Japanese honeysuckle and Chinese wisteria are now with us for the long term, and it just occurred to me that the Tarzan vines might really have been kudzu. (adapted from Bayou-Diversity: Nature & People in the Louisiana Bayou Country; LSU Press)
Bayou-Diversity (3 September 2017)DENTITION – If Little Red Riding Hood had prowled about the Louisiana bayous and come across a grinning possum, she would not have been nearly as dazzled by the Big Bad Wolf’s dentition. Possums you know have 50 teeth including quite formidable canines, while the lowly wolf can only boast of 42. Teeth more than any other anatomical feature define many animals. A single tooth can reveal the age, sex, diet, health, and species of an animal that lived thousands of years ago.
Some fish, reptiles, amphibians, and primitive birds have teeth, but the highest level of dental complexity is found in mammals. Their teeth are composed of a core of dentin surrounded by a crown of enamel, the most durable body part known. The teeth of mammals are specialized into varieties. Incisors are found in the front of the jaw and are designed for cutting. In rodents such as rats and beavers and also in rabbits, they grow continuously throughout the life of the animal. Frequent gnawing keeps them worn to an effective length. Canines, located behind the incisors, are spear-like and used for piercing prey and tearing flesh. Most predators have prominent canines. Premolars and molars grow in the back of the jaw and are efficient at grinding and macerating food. Grazing animals depend on them.
Not all mammals have all four types of teeth. Herbivores, animals that eat mostly vegetation, don’t need canines, and thus they are absent in deer and cottontails. Deer, like cows, have no upper incisors. They nip off grass and leaves between the lower incisors and the hard upper boney palate. This fact frequently astounds novice deer hunters when they discover their trophy has no front teeth. Meat eaters, such as members of the cat family, have pronounced canines but reduced grinding teeth. Animals that eat meat and vegetation, bears and humans for example, have teeth intermediate in development between those with more specialized diets.
Mammals usually develop two sets of teeth – milk or deciduous teeth and permanent teeth. Methods have been developed to determine the age of many kinds of animals by the eruption patterns and the degree of wear of different teeth. In raccoons the first permanent incisor appears at 65 days, the first molar at 78 days, and the first canine at 105 days of age. Deer are aged in yearly increments by the emergence and amount of wear on premolars and molars.
Mammals are the only class of animals with a precise number of permanent teeth in each species. Fox squirrels have 20, gray squirrels have 22, swamp rabbits have 28, cougars have 30, humans have 32 as do red bats and deer, and skunks have 34. The enigmatic armadillo has 32, and all of them are peg like molars. Ms. Riding Hood would not be impressed. (adapted from Bayou-Diversity: Nature & People in the Louisiana Bayou Country, LSU Press)
Bayou-Diversity (30 July 2017) ECOTONES The term “ecotone” can be defined as a transition area between two adjacent ecological communities. It usually has some common characteristics of each bordering community and often contains species not found in either of the two. Ecotones exist at different scales. It may be the edge of your back yard where it butts up against a bayou or patch of woods. It can be a 20-mile wide strip that separates the eastern front of the Rocky Mountains from the Great Plains or the northern evergreen forests from the tundra.
In north Louisiana a distinct ecotone generally follows the path of the Ouachita River. Historically, this ecotone separated the very different bottomland hardwood forests east of the river from the mixed upland hardwood/pine forests west of the river. The actual ecotone is at the western bank of the river in some cases where the hills come down to the water’s edge. In other areas where the river has meandered away from the hills, the ecotone is farther from the river. It can be thought of as that area where the red clay hills drop off into the swampy bottomlands. Other ecotones in Louisiana included those between the freshwater marshes and prairies of southwest Louisiana, and the longleaf pine and upland hardwood forests in the Florida parishes.
One important aspect of ecotones is their value as wildlife habitat. Generally speaking, the more different types of plants found in an area, the more kinds of animals live there also. Since ecotones have plants common to both adjacent areas, many animals have an easier time making a living there. In the north Louisiana example, squirrels have the opportunity to feed on acorns from oaks that only grow in the swamps and also on those types that grow on the drier hill soils. Several species of birds thrive in ecotones along forest edges. Mockingbirds and indigo buntings live on the edge of woodlands but are rarely found deep in a forest.
Humans also took advantage of the ecotone along the Ouachita River. The abundant and diverse natural resources of the hill and swamp forests found in close proximity may be one of the reasons why the North American mound-building culture began along this dividing ecotone. As a practical concept important to their daily survival, early Native Americans could have defined the word “ecotone” better than we can today. (adapted from Bayou-Diversity: Nature & People in the Louisiana Bayou Country; LSU Press)
Bayou-Diversity (23 July 2017) HARD LESSONS At the turn of the 20th century the science of wildlife management was in its infancy. Reeling from the catastrophic human-induced losses of America’s iconic fish and wildlife resources such as the vast bison herds and billions of passenger pigeons to market hunters, and countless plumed wading birds for the sake of vanity, a growing contingent of citizens began demanding a counteractive response to the wholesale pillage of nature. Thus was born the profession of wildlife management.
A common objective of many such programs was the restoration of depleted fish and wildlife species. Not surprisingly and because the field of ecology (the interrelationships of organisms with their environment) was yet to hatch, some well-meaning programs involved efforts to establish species in areas where they had never lived in the first place. A good Louisiana example involves elk.
Historically, elk were very rare, transient visitors in the state. Only one record of substance occurs in the literature. However, this fact was of no concern to early biologists and eager citizens who knowing the popularity of elk as a western game animal sought to add this species to the list of Louisiana’s resident fauna. This sentiment resulted in the introduction in 1916 of wild elk from none other than the famous herds of the Yellowstone region. On January 24, 1916, forty elk captured on a ranch near Gardner, Montana arrived on a train car at Urania in LaSalle Parish. They were promptly released on 2,000 fenced acres of the state forest preserve. Ten of the animals died soon after release “from broken ribs puncturing the walls of the lungs” during the long, jolting cross country transit. Later, one escaped from the enclosure and was struck by a locomotive. Another was shot by a local citizen who was quickly prosecuted for the poaching. By 1920 only 24 animals remained and soon after all were gone. They could not adapt to such a drastically foreign environment.
Bayou-Diversity (9 July 2017) ALLIGATORS & US As apex predators, carnivorous species that lurk at the top of the food web, alligators toy with our psyche not unlike the mythological Sirens. Once exposed, we are vulnerable. Alligators, as we know them, have existed for 65 million years or so. As a species, we humans have shared common ecosystems with American alligators for no more than 13,000 years, and most of what we learned of them in that time has been forgotten. Yet within the brief era of recorded history, humans have accumulated a large body of information pertaining to alligators. As a method of assessing its significance and the permeation of alligators into all aspects of our modern culture, consider that a recent Google search of the word “alligator” yields 57,600,000 results in 0.18 seconds. How is this to be interpreted? Which of the results are germane? Is it the article that describes how President Hoover’s son, Allan, allowed his two pet alligators to wander around inside the White House? Does the journal report of a medical discovery that alligator blood products may successfully treat diabetics pass muster? Is it the website for the Alligator Warrior Festival in Lake City, Florida? Or the scientific paper that assesses the impacts of sea level rise on coastal alligators? Assuredly, only those search results that expose a connection between alligators and people should be considered important. That would leave all 57,600,000 as a measure of their standing. And so the fascination continues. (adapted from American Alligator – Ancient Predator in the Modern World; copyright Kelby Ouchley, 2013; photo by Burg Ransom)
Bayou-Diversity (4 June 2017) ROAD HAZARDS For several months I conducted a highly unscientific survey to determine which of our native mammals deserves the dubious title of Road Kill King of Louisiana. Though inconclusive my results indicate that the ubiquitous armadillo ranks near the top, perhaps second only to possums whose primitive neurons have yet to grasp the physics of speeding Pontiacs.
A wise wildlife professor once taught that if a particular species of animal is commonly killed on the highways, it usually indicates a high and sustainable population of that animal in spite of the roadkill mortality. Such is the case with armadillos throughout our state. However, this was not the situation until recently. Armadillos migrated from south Texas into southwest Louisiana in the early 1900’s and didn’t become common until the 1950’s. Properly known as the nine-banded armadillo for the armor-like flexible bands protecting its back and sides, this warm- blooded mammal is one of the most peculiar of our fauna.
Often maligned for burrowing in gardens and flower beds, research into their food habits has shown that armadillos consume large quantities of harmful insects. In one study in Kisatchie National Forest, beetles and their larvae comprised nearly half their diet. More recent work proves that armadillos eat vast numbers of fire ants, and their burrows provide habitat for different types of wildlife.
Breeding usually occurs in the summer and delayed implantation postpones birth until spring. Four identical quadruplets are almost always born, resulting from a single fertilized egg that divides twice. This unusual reproductive feature insures that all four young in any litter are the same sex and genetic carbon copies.
On a more ominous note, armadillos are the only animals other than man known to harbor the bacteria that cause Hansen’s disease, once known as leprosy. The likelihood of transmission of Hansen’s disease from armadillos to humans is, however, very low. Researchers determined that while the leprosy bacterium is common in some Louisiana armadillo populations, there is no cause for alarm for the average citizen. In fact, the greatest harm likely to come your way from an armadillo is the cost of a front-end alignment should you meet on the highway. (Adapted from Bayou-Diversity: Nature & People in the Louisiana Bayou Country; LSU Press)
Bayou-Diversity (20 May 2017) NEWS BEES Mark Twain was famously quoted as saying, “Clothes make the man.” Many sources stop him there and omit his following wit, which was, “Naked people have little or no influence on society.” Adornments are important to animals also. A good example is that inch-long, black and yellow bedizened, hornet-looking creature that zips in to hover just in front of your face on a summer afternoon before rocketing away on a zigzag trail not unlike the cartoon roadrunner. This gaudy insect influences society also, usually in the form of terror as it buzzes threateningly inches from one’s nose. Like clothes, the insect’s garments are superficial, and what you see is only a ruse.
God, in a seemingly playful mood, decked out this innocent insect as an example of mimicry in the natural world. It’s not a bee or a hornet, and its correct name is Yellowjacket Hover Fly. Bees have four wings; this fly has two – not that they will ever beat slowly enough for you to count them. Bees also cannot hover like this fly. As a fly, it has no stinger and is absolutely harmless. Biologists refer to the yellow and black color theme as aposematic coloration – a bright flash of danger that tends to warn off predators. In this case, the hover fly is thought to mimic a yellowjacket. Even its loud buzz and aggressive flight is a form of mimicry.
In the South, we call this insect the “news bee” or the “good news bee” for its habit of hovering in front of a person and “giving them the news.” Some say that he is actually telling you the news, while others claim that he is saying that important news will soon arrive. If one lights on your finger, which they do on occasion if offered, good luck is guaranteed. Actually, you will benefit from the presence of a yellowjacket hover fly whether it lights on your finger or not, as it goes about its important business of pollinating the flowers in your yard – a considerable influence on society. (Adapted from Bayou-Diversity: Nature & People in the Louisiana Bayou Country; photo by Charles S. Lewallen)
Bayou Diversity (1 May 2017) RAIN CROWS One definition of the word lurk is to lie in wait in a place of concealment. Among those birds that spend time along Louisiana bayous, one species in particular can be said to exhibit this behavior as a matter of habit. Rain crows, often heard but less often seen, are bona fide lurkers as they perch with hunched shoulders that belie a long, graceful neck in a pose that for all the world appears to me an expression of guilt. Of course, my scientist brethren will justifiably gnash their teeth at this anthropocentric characterization of a wild animal and label me a heretic, so I’ll take it back, mostly. The part that I am holding fast to is the moniker “rain crow.” You won’t find rain crows in your field guide or on the checklist of Louisiana birds. Instead, their photo will be near the roadrunner to whom they are kin, and it will be labeled as the yellow-billed cuckoo. So rain crows and cuckoos are one and the same. They are long, slim birds with swept back wings and a long tail. Brown above and white below, they have a yellow bill as the name implies and a dark face mask.
Rain crows are long-distance migrants arriving in Louisiana in late spring and departing in early fall. Most spend the winter in South America often as far away as Brazil and Argentina. With little time to spare along the bayous rain crows have a very short nesting cycle compared to other birds. Young birds are fully feathered and capable of leaving the nest only 17 days after the beginning of incubation. Rain crows in America (which include the black-billed cuckoo – a species that only passes through Louisiana) occasionally lay their eggs in other birds’ nests but not to the extent of their infamous cousin, the common cuckoo of Eurasia.
The diet of rain crows is unique in that it consists mostly of caterpillars. They are among only a few bird species that eat hairy caterpillars and are especially fond of web-building, tent caterpillars of which they can eat as many as 100 in one occasion. As natural biological controls for insects that are capable of defoliating entire forests, it is expressly alarming that the continental population of this species has declined 54% since 1970 for reasons that are not clearly understood. The ubiquitous, systemic use of pesticides is one suspect.
Bayou-Diversity (12 March 2017) PAWPAWS During one of the earliest European explorations of interior North America in 1541, Hernando de Soto’s scribes wrote of a peculiar tropical-like fruit that was being cultivated by Native Americans. When President Thomas Jefferson sent William Dunbar and George Hunter to explore the Ouachita River in 1804, Hunter recorded a small bayou named after this plant that entered the river on the east side about a league above the mouth of Bayou Bartholomew. Two years later as the Lewis and Clark expedition neared the end of their epic journey to the Pacific Northwest, they depended on the fruit of this plant for sustenance when their rations ran low and game was scarce. Many of us still sing a jingle about picking up the fruits and putting them in our pocket.
The plant in all these scenarios is pawpaw (Asimina triloba), a small understory tree found throughout most of Louisiana except for the coastal parishes. Rarely more than 35 feet tall it grows best in fertile, well-drained soils. Dense, clonal patches form as stems sprout from underground rhizomes. Small maroon flowers appear in spring before the new leaves and have a very faint odor of rotting meat. Not surprisingly, they are pollinated by the likes of blow flies and carrion beetles.
It is these fruits that have attracted the attention of humans for thousands of years. They are considered the largest, edible native fruit in North America. Yellowish-green in color, they are two to six inches long and filled with bright yellow pulp and large brown seeds. Their flavor has been described as custard-like, similar to a combination of banana, cantaloupe, and mango. Eaten raw or as substitutes for bananas in baked desserts, their nutritional value as measured in vitamins, minerals, amino acids and calories is greater than that of apples and peaches.
Bayou-Diversity (5 March 2017) NOSEY NEIGHBORS Though mates for life, for much of the year they sleep on opposite sides of our house in the woods. One we call the east wren. This is the male. The west wren is the female that sometimes roosts above the front door or in a wind chime that she often rings on a dead calm evening seemingly for her own amusement. They are Carolina wrens, the most common of five species of wrens in Louisiana. Except for marsh wrens that nest along the coast, the others only spend the winters here. A pair of Carolina wrens will establish a territory and live their entire lives in one small area. They are small, brown, rotund birds with a long, downcurved bill and a long tail that often bobs over their backs. A slender white stripe above each eye is characteristic. They are busybodies and in addition the male is a loudmouth. They creep and probe around under my front porch and in the garage, explore the firewood stacks, and if their business is questioned dive headlong into brush piles that I leave for cover in the yard. The east wren defends his territory all year by singing from a large repertoire of loud, whistling calls in a constant, playback loop. Some imagine that at times he is saying “teakettle, teakettle, teakettle.” Only the males sing loudly. Females are fussy with a vocabulary limited to stridulant buzzes, chirrs, and half-hearted songs.
Bayou-Diversity (12 February 2017) WILD BIRD LONGEVITY While cleaning out wood duck boxes in anticipation of the upcoming nesting season, a biologist on Upper Ouachita National Wildlife Refuge recently found a roosting screech owl in one of the boxes. The small owls are often found in the boxes and are occasionally banded during the encounter. When this owl was captured the biologist noticed that it was already banded. He duly noted the band number and released the bird. Upon checking records back at the office, he was surprised to find that the owl had been banded as an adult eight years earlier. This means the bird is now at least ten years old and brings up the question of how long do birds live in the wild.
First it should be noted that records of captive birds are not relevant because of the natural hazards faced in the wild. It is hard to determine longevity of wild birds and most reliable records are a result of recapturing banded birds as with the screech owl mentioned earlier. Within the lifespan of birds, the highest mortality occurs in young birds soon after they fledge. From that point forward survivors face a never-ending threat of dangers and very few die of old age. As an example, studies show that the average adult life span of Louisiana songbirds is about 10 months. In general, larger birds live longer than smaller birds. Great blue herons live longer than killdeer and bald eagles live longer than house wrens. The following list indicates longevity records for several species of Louisiana birds*. It’s important to remember that the average life span for each species is much lower than these maximum records.
Bayou-Diversity (29 January 2017) THOSE SENSUAL PLANTS Does your magnolia tree in the front yard have feelings? How about the Better Boy tomato plants that you pinched the suckers from yesterday? In order to evoke feelings it is necessary to capture some sort of stimuli from our surroundings, and for that to happen we need sensory receptors. In humans that means eyes, ears, a nose, taste buds, and touch sensitive cells. But what about plants? Can they hear, see, smell, taste, and recognize touch. Twenty-five years ago these ideas were considered on the fringe of credibility; today plant science is revealing the concepts to be routine mechanisms of life in the botanical world. It is important to remember that since plants receive environmental cues using different organs than we do, the definition of terms like seeing, smelling or tasting is broadened considerably.
Seeing involves the ability to perceive light. In humans that occurs in four types of photoreceptors in the back of our eyes. Plants have as many as eleven kinds of photoreceptors scattered throughout their leaves and stems. Consider the many types of sunflowers whose faces follow the sun across the sky on a summer day, or the canopy of a young oak tree that grows toward light and away from the shade of its neighbors.
The sense of touch in plants is expressed in many ways. The tendrils of vines such as English peas and poison ivy climb, cling to, and twirl around supports using touch. Carnivorous plants like Venus flytrap snap shut at the touch of insects, and they are able to differentiate between an insect and rain drop. As children we were amazed to see the tiny leaves of mimosa plants suddenly close up when stroked.
Plants can smell in that they can detect the volatile chemicals in odors. Tomatoes wounded by insects are known to emit odors that are alarms signals for their neighbors who can then produce chemicals that defend against the attackers. If you put a ripe and unripe apple in the same bag, the unripe one will ripen faster because it detects a ripening pheromone released by the other. In the wild it is often advantageous for a tree’s fruit to ripen simultaneously in order to better attract animals that will disperse its seeds. As in humans, taste in plants is closely tied to smell but less understood.
Contrary to popular accounts plants don’t likely perceive music. There is no hard evidence that my mustard greens prefer Willie Nelson over Johann Bach. However, the chewing sounds of an insect is another matter. In one experiment when researchers played recordings of munching caterpillars, nearby plants flooded their leaves with potent chemicals to deter the perceived attackers. The exact parts of plants that respond to sound have not been discovered but a special protein found in all plants cells is suspect.
Bayou-Diversity (15 January 2017)PADDLEFISH POLITICS Seemingly unrelated political decisions often impact wildlife resources and lead to a cascade of unanticipated events in the most unlikely of places. That U.S. policy in Iraq and Iran could suddenly influence my daily biological work in the spectacular Lacassine marshes of southwestern Louisiana is a good example. The nexus involves humans’ peculiar obsession with fish eggs, and the story line goes like this. Caviar, the peculiar salt-cured eggs of sturgeon, with origins in the Mideast was a hot commodity in American markets until the late 1970s when all imports from Iraq and Iran were banned for alleged bad behavior. Not to be outdone with the loss of two of the world’s largest caviar exporters, U.S. markets turned to eggs of native paddlefish as a substitute and prices for this heretofore inconsequential commodity soared. Suddenly, in 1984 the bayous and especially the Mermentau River that braided the Lacassine marshes were filled with nets of nonresident commercial fishermen seeking the abundant and totally unregulated paddlefish resource.
Paddlefish are prehistoric in appearance and physiology and have been around since 50 million years before the first dinosaurs showed up on the scene. They are unique in having a large paddle-shaped snout, called a rostrum, which comprises a third of their body length. Once thought to be used as a shovel for rooting up food items, the rostrum is now known to be filled with electrical receptors that can detect masses of tiny zooplankton, their primary food. As filter feeders they swim through the water column with their huge mouth agape like a whale shark. They are one of the largest freshwater fishes in North America, exceeding 5 feet in length and weighing more than 100 pounds. Paddlefish are slow to mature and females don’t breed every year. Native to the Mississippi River Basin, they are known to make long migrations of as much as 2,000 miles. Once common in 22 states, they have vanished from 11 and are endangered in several more. Overfishing, sedimentation in spawning areas, and development, especially dams, have caused declines.
Bayou-Diversity (11 December 2016) REDEYES Always in late February when the first white crawfish reached two inches in length a ritual began in the D’Arbonne Swamp that included my father, his cousin, and me, an adolescent youth in those years a half century ago. The object of the tradition was to procure “smallmouth bass” for the deep, black skillet. Using a long-handled, homemade drag consisting of a joint of one-inch galvanized pipe attached to a basket of hardware cloth, we scraped the ditches along White’s Ferry Road for the tender crawfish. When a sufficient number filled the steel, five-gallon bucket stuffed with Spanish moss, we were set to go the following morning. Barring a late cold front we launched the low-sided Arkansas Traveler at Holland’s Bluff landing at first light as wood ducks beat their way from buttonbush roosts to the oak flats. The bayou was different then before the Corps of Engineers’ latest edition of navigation improvements on the Ouachita River drowned the shallow, rippling gravel bars under quiescent, sediment-laden pools. Dad knew the location of these unique habitats even if they were hidden under winter backwater, and the 7 ½ horsepower outboard pushed us upstream toward Old Mill, site of a short-lived sawmill, or perhaps the Wreck where the steamboat Tributary burned and sank in 1890. Here we anchored, fitted spin-cast rigs with lead weights and 2/0 hooks baited with the crawfish, and flung the offerings into the cold, dark bayou. Almost always we caught the spunky red-eyed bass.
Many years and a challenging ichthyology class later I learned in no uncertain terms from a favorite professor that smallmouth bass are not native to Louisiana because they are adapted to live in cooler waters. The bass that we caught then on Bayou D’Arbonne are properly called spotted bass, members of the black bass group along with largemouth and true smallmouth bass. Other common names of the spotted bass are Kentucky bass and redeye bass. Resembling slender largemouth bass, spotted bass have black splotches along their sides, and indeed their mouth is smaller than that of their abundant largemouth cousins. We rarely caught a spotted bass of more than two pounds, and the Louisiana state record for the species is less than five pounds.
Bayou-Diversity (4 December 2016) GRANDDFATHER’S TURTLE That an old, time-marred box turtle in my hand today could be the same one held by my great grandfather on the edge of this swamp a hundred years ago infers a connection mystical if not spiritual. Though unlikely, it is possible.
The most common land turtle found throughout Louisiana is the three-toed box turtle, a subspecies of the eastern box turtle, so named because it usually has three toes on each hind foot. A second species, the ornate box turtle, is very rare and only occurs in the extreme southwestern part of the state. Box turtles have hinged bottom shells (the plastron) that can close tightly against the upper shell (the carapace) for protection. Their high domed shells are about five inches long when mature. Males often have a concave plastron, red eyes, and orange markings on the head and front legs. Females have yellow or dark eyes, duller markings, and a flat plastron.
Most breeding and egg-laying occurs in the summer. Females dig a hole and lay 3 to 8 elliptical, thin-shelled eggs that hatch in about 3 months. Box turtle eggs and hatchlings suffer high mortality rates. It takes 5 to 7 years for the young turtles to become sexually mature. They are omnivorous and eat a variety of plants, insects and other animals including flowers, roots, berries, mushrooms, earthworms, snails, slugs, beetles, and caterpillars. They survive cold winter temperatures by burrowing into the leaf litter and becoming dormant. Their wintering site is called a hibernaculum.
Bayou-Diversity (27 November 2016)TROUBLE MAKERS They were thought of as noisy mobs of rogues hell-bent on destruction. They swarmed the grain fields and orchards of European settlers consuming the fruits of hard labor. If they possessed redeeming qualities it was only after they were dead and skinned, either for decoration on women’s hats or fried in lard for the table. Linnaeus named them Carolina parakeets in 1758, and within that group there was a subspecies with slightly different colored plumage called the Louisiana parakeet. Carolina parakeets lived farther north than any member of the parrot family. From southern New England to as far west as eastern Colorado and south to the gulf coast this small parrot inhabited hardwood forests, especially preferring the primeval bottomlands in the Mississippi and Missouri River basins. Within the modern boundaries of Louisiana this included most of the state.
Carolina parakeets were about 13 inches long with wingspans of just less than two feet. Mostly green with a yellow and orange head and splashes of yellow on the shoulders and down the wings, they were clown-like in appearance and behavior, living in noisy flocks of up to 300 birds. At night they roosted in cavities of large, hollow trees of the swamps such as cypress and sycamore. During the breeding season they nested in similar holes. Wild fruits and nuts were their natural foods including those of beech, maple, oak, pine, cypress, and grapes. Many historical accounts mention Carolina parakeets’ affinity for cockleburs, a dreaded weed in southern fields. However, even their valuable service in controlling cockleburs did not mitigate the wrath of farmers who viewed their depredations as warranting death sentences. John James Audubon wrote, “The gun is kept at work; eight or ten, or even twenty, are killed at every discharge. . . I have seen several hundreds destroyed in this manner in the course of a few hours.” Audubon himself shot a Carolina parakeet near St. Francisville about 1821 to use as a model in his painting of that species.
Bayou-Diversity (15 November 2016) CIVIL WAR WITNESS TREES Last year marked the conclusion of the sesquicentennial of the American Civil War. One hundred fifty-one years ago a conflict ended that wrenched our country apart and killed more Americans than all combined wars since.
Of course, no one is alive today to recount the history of the Civil War era. We are dependent on millions of records, books, letters, diaries, and other documents to narrate the stories, large and small. No people yet live who beheld the drama, but there are still surviving organisms that trembled at the impact of mortars, lost limbs to cannon fire, and suffer musket balls deep within their living tissues. They are witness trees, trees that stood silent and witnessed the carnage of battles and persist in life today. Like the last Civil War veterans who faded into time in the 20th century, the remaining witness trees are succumbing to age, disease and accident. If the survivors could talk their stories would enthrall.
A giant sycamore on the bank of Antietam Creek is a living witness to America’s bloodiest day when on September 17, 1862 Confederate and Union armies fought a battle that yielded more than 23,000 casualties. On the first day of the tide-changing battle of Gettysburg, Union General Daniel Sickles established his headquarters under a surviving swamp white oak. A cannon ball crushed the general’s leg as he sat horseback in the shade surveying the action. A silver maple at Shiloh beheld similar events, and a red oak at Bull Run stood through two major battles. President Lincoln delivered the Gettysburg Address near a huge honey locust that lives yet, and a pin oak at Appomattox Courthouse witnessed the formal end of the national tragedy.
Bayou-Diversity (6 November 2016) KEEPING THE LIGHTS ON High electricity bills are aggravating, but we often forget that in the two hundred thousand years of modern human history we have only been able to complain about this particular problem for less than a hundred years. Choosing as a point in time the early colonial days of Louisiana we note that there were no electric or gas lights, no kerosene lanterns; even dependable matches had yet to be invented. Candles were the main source of lighting and they weren’t cheap. Made from the rendered fat of whales, hogs, and bears, candles for most people were expensive, luxury items. One did not need to be reminded to turn out the lights when leaving a room.
Even then more economical sources of energy were in demand, and early settlers learned of one in the form of a native plant that we now call southern bayberry or wax myrtle. This broadleaf shrub that grows to 20 feet tall is common throughout the state. Pale blue berries grow on the female plants and are coated with wax. Boiling the berries causes the wax to separate so that it can be skimmed off and molded into candles, and many settlers soon learned to cultivate the plant for that purpose. In 1727 a shipload of Jesuit priests arrived from France and settled on a tract of land just upstream of New Orleans. There they established a plantation of wax myrtle as a commercial enterprise. Soon their product was being exported to other parts of America, as well as France.
Bayou-Diversity (30 October 2016) CANEBRAKES One of the most interesting historical features of the Louisiana landscape was the canebrake. President Teddy Roosevelt described them well in an early 20th century visit to East Carroll and Madison Parishes. He wrote, “The canebrakes stretch along the slight rises of ground, often extending for miles, forming one of the most striking and interesting features of the country.
In describing the Morehouse Parish haunts of legendary woodsman Ben Lilly, Frank Dobie wrote, “Canebrakes stretched for miles and miles, the hollow stalks that waved their green blades fifteen or twenty feet up in the air rooted so densely that only bears, razorback hogs and a man with a knife could penetrate them.”
For local Native Americans, canebrakes furnished abundant raw materials for a plethora of products. It was used in the manufacture of blowguns, darts, arrow shafts, shields, knives, spears, duck calls, whistles and flutes. Cane was weaved into rafts, baskets, bedding, roofing, floor and wall coverings.
Today only scattered small remnants of the once vast canebrakes can be found in our area. Most were converted to agricultural fields. In a voyage to Louisiana in 1803, C.C. Robin wrote, “This reed only grows on land that is never (or almost never) flooded. . . . These cane brakes, on account of the large amount of humus that they deposit, make the soil very fertile, and the farmers regard their cane brakes as the best possible land; in fact, they judge the quality of the soil by the thickness of the cane.”
Bayou-Diversity (30 September 2016)BRETON ISLAND—BP OIL SPILL [from my field diary]The headquarters of Delta National Wildlife Refuge is located at the end of the road in Venice, Louisiana on Grand Pass near its confluence with the main channel of the Mississippi River.On the afternoon of May 3, 2010 we eased out of the boat slip in a 29-foot catamaran powered by twin 250 horsepower Suzuki outboards.The big motors had plenty of reserve as we cruised at 30 knots across the river, down another pass, and out into the Gulf of Mexico.In just over an hour we set anchors on the leeward side of North Breton Island and waded ashore.This remnant of a much larger island once harbored a schoolhouse for the residents before hurricanes reduced it to 40 acres of scrubby mangrove and sand spits.Later in 1904, Teddy Roosevelt in an executive order declared it the second National Wildlife Refuge in America.On this day the place is spectacular.Thousands of shorebirds, gulls, and terns whirl and swirl in clouds of wings, some in rigid formation, others beating across the grain intent on life’s chore of the moment.Two peregrine falcons slash through the flocks causing short-lived panic.This vibrant pulsing of activity mesmerizes us for a while, making it difficult to remain on-task.Our mission involves another species, one that was once extirpated in Louisiana even though it is our official state bird.Thirteen hundred pairs of brown pelicans, not long removed from the endangered species list, are nesting in the island’s mangroves.We have come to assess the condition of the nests and the colony in general.Our findings in a normal year would be considered excellent.Most nests have a full clutch of three eggs that will begin hatching in a few days.The colony is thriving.Surveys such as this are conducted annually, but this one is not routine.To the south, 200,000 gallons of crude oil are gushing wildly into the sea every day from an out-of-control well a mile below the surface.On the horizon a sheen of toxic oil rides the crests of waves driven by a relentless south wind.It is hard not to think that immorality is the cause of the requiem we are documenting.
Bayou-Diversity (23 September 2016) LOUISIANA Across the country we are known for our moss-draped cypress trees, slow meandering bayous, antebellum homes, spicy cooking . . . and litter. In spite of our wonderful assets, our litter liability is one thing most visitors remember. Everyone is impacted. All other things being equal and given a choice, would you rather live and work in an area that is trashed out, or one that isn’t? It’s one of those ephemeral quality of life issues.
There is a form of littering that many people innocently condone without thinking. I find it in the most remote areas of our state, in the middle of roadless floodplain forests and far out in the marshes, in areas where other litter is uncommon. In these settings it is especially garish and obtrusive. I am referring to balloons, the helium filled ones that are released at promotional and political events, ballgames, and parties. When released balloons are out of sight, they should not be out of mind – what goes up must come down. Millions are released each year. Latex balloons, which are made from the sap of rubber trees, are usually biodegradable and less of an impact than foil or mylar balloons that persist in the environment. Attachments such as ribbons and string are particular problems as they sometimes entangle birds and other wildlife. In coastal areas, sea turtles, dolphins, whales, and fish ingest balloons, which they may mistake for jellyfish, a favorite food.
Bayou-Diversity (16 September 2016) BULLBATS The award for the Louisiana bird with the most misleading name should be conferred on the common nighthawk, also known as the bullbat. No part of these monikers is accurate. In the first place, they are not common any more as long-term surveys show their populations in the United States have declined 61 percent between 1966 and 2014. As for “nighthawk,” they are neither solely nocturnal nor even remotely kin to hawks. Instead, they are crepuscular, which means they are active at dawn and dusk, and they are closely related to the more familiar whip-poor-wills and chuck-will’s-widows. The term bullbat may have roots in the courtship behavior of this species. Males perform impressive display flights of steep dives and abrupt maneuvers that produce a deep roaring sound as wind rushes over the wing feathers. To someone with a vivid imagination this may be analogous to a bellowing bull. As for the “bat” in bullbat, well that takes even more inventiveness.
Common nighthawks are about the size of a robin but appear larger because of their long pointed wings. They are mottled gray in color with a large, distinctive white patch on each wing and another under the chin. They are most active while feeding in the failing light on either side of sunset as they fly in ovoid loops and erratic glides. Nighthawks can sometimes be seen feeding in the glow of stadium lights and illuminated billboards that attract clouds of insects. Their in-flight call is often described as a buzzy pzeeent. During the day they are well camouflaged as they roost on tree branches, fence posts, or the ground. They do not construct nests and lay two eggs directly on the ground. Not uncommonly, they also choose flat roofs for nest sites. Common nighthawks are long distance migrants nesting throughout much of the United States and wintering in South America. In Louisiana they arrive in April and depart in September. Their life on the wintering grounds is still mostly unknown to science.
Bayou-Diversity (9 September 2016) COW KILLERS Boys are impressionable creatures. They hone in on pronouncements that combine adventure and danger. Such was my experience many years ago when I was warned by elders to avoid at all costs an insect with the moniker “cow killer.” How could such a beast in our midst not be a call to action? A colloquial synonym for this organism is red velvet ant. It was claimed that the sting was so terrible that it could dispatch a healthy cow. I set out to catch one in a Mason jar.
It was many years after that encounter when I figured out that my early mentors were not first-class entomologists. So-called red velvet ants are large, colorful insects about ¾ inch long. They are black with dense patches of reddish-orange hair on the thorax and abdomen. In Louisiana they are often seen in late summer running around in open areas, especially those that are sandy. Females lack wings and do indeed possess a potent sting though verified records of cattle mortality have not come to light. Males are similar but have two pairs of wings and cannot sting. And here’s a bit of relevant trivia: they are solitary wasps, not ants. They differ from ants in having straight antennae rather than antennae with a jointed “elbow.” Ants also have a much narrower “waist.”
The life cycle of cow-killer velvet ants is fascinating. Females seek out ground-nesting bees such as bumble bees and lay their eggs inside the nest. The eggs hatch and develop into larvae that feed on the bumble bee larvae. Other species of velvet ants parasitize certain types of flies and beetles, thus serving as natural control agents. Adult velvet ants feed on nectar.
Bayou-Diversity (28 August 2016) LOUISIANA SQUIRRELS It has been suggested that some credit for American independence is due squirrels, which served as abundant targets to develop a citizenry of marksmen, and stew ingredients for pioneers. Perhaps they should receive more acclaim for perpetuating eastern hardwood forests as a result of their habit of burying larders of acorns, pecans, and hickory nuts.
Two species of diurnal squirrels are common in Louisiana – fox squirrels and eastern gray squirrels (also known as cat squirrels). Fox squirrels are generally larger, weighing up to three pounds. They have grayish-black backs and orangish bellies. Some local populations, such as those in the Tensas Swamp, have high numbers of melanistic or solid black individuals. Gray squirrels rarely weigh over two pounds and are gray above and silver-gray below. Both species have long bushy tails, which are used at various times for balance, as a blanket, parachute, or umbrella. Fox squirrels tend to inhabit older, open forests whereas cat squirrels prefer hardwoods with a denser mid-story canopy and ground cover. Dens are in hollow trees or leaf nests.
Squirrels usually have two breeding seasons per year. Breeding peaks in January and February and again in May and June. Three or four young are born about six weeks later and are weaned in two months. Squirrels have lived up to fifteen years in captivity, but in the wild a three-year-old squirrel is old.
The diet of squirrels consists of acorns and other mast, buds, flowers, fruits, fungi, insects, and the inner bark of trees. A single squirrel can bury several thousand acorns over a period of a few months. Some of these are recovered later by smell, but many others germinate and contribute to the reproduction of hardwood forests.
Bayou-Diversity (14 August 2016) GROUNDHOG MILLS – Except for coastal marshlands and tallgrass prairies of the southwest, Louisiana was historically a world of forests. Virgin stands of longleaf pine in the central part of the state, primeval bottomland hardwoods and cypress swamps, along with upland hardwoods and pines in the hill country were viewed by settlers as both daunting obstacles and coveted natural resources in the form of potential wood products. Logging on a scale that depleted the state’s virgin forests, however, did not begin in earnest until about 1900 when reliable steam-powered and later diesel or gasoline sawmills became common. Burgeoning railroads to move logs and products contributed to the elimination of our original forests. By World War II Louisiana’s virgin forests were practically gone.
The sawmills were not all large, industrial-scale facilities. Almost every town or village had a mill of some kind, often called a “groundhog mill.” Other than the stereotypical operation that produced lumber from large logs, specialty mills abounded. Shingle mills made roofing shingles, usually from cypress heartwood. Stave mills sawed thin boards that were used in barrel-making before steel barrels became common. The best and most valuable barrel staves were made from white oak. Hoop mills cut elm logs into thin strips that were then steamed and shaped into circular rolls. The hoops were used to hold together many types of wooden barrels, kegs, butter churns, and containers for “hoop cheese.” Tie mills specialized in sawing cross ties for the railroads. They could utilize smaller trees that were not otherwise merchantable. Handle mills were found where hickory trees were abundant. The hard, durable wood was sawn into bolts to dry and later finished into a variety of tool handles. Planer mills smoothed rough-cut lumber into finished products.
Bayou-Diversity (7 August 2016) SHAKESPEARE & STARLINGS – THE NEXUS That humans are increasingly impacting the natural world is beyond question. Our influence often comes by way of odd and sinuous paths. Consider that the presence of one very common but non-native and often harmful bird species in Louisiana can be attributed to William Shakespeare.
The European starling, a native of Europe and western Asia is now found on every continent except Antarctica, a result in most cases of intentional releases by humans in the last hundred years or so. Starlings are a bit smaller than robins with black plumage that reflects metallic green in sunlight and is covered in small white dots. Close kin to mynah birds, they have a broad repertoire of calls including a clear, musical gurgling unlike any of our native species. They are generalists in terms of habitat preference, thriving equally well in urban and rural areas. Starlings are also not picky in their feeding habits and readily eat a wide variety of insects, spiders, worms, seeds and fruit, items that would otherwise be available for native birds. As cavity nesters they readily commandeer bird houses and natural holes in dead trees. In areas where cavities are in short supply this behavior may be detrimental to native birds, especially those with declining populations like the red-headed woodpecker.
Bayou-Diversity (31 July 2016) WOLVES OR NOT? John James Audubon’s son, John Woodhouse Audubon, was a pretty good artist in his own right. When the elder Audubon began showing signs of mental illness toward the end of his career, his son stepped in to complete their famous portfolio on American mammals. The topic of the day is the younger Audubon’s Plate No. 82 from the year 1845 and depicts a wolf standing on a sandbar in a Texas river, sniffing a bison horn surrounded by scattered mussel shells. He labels it the “Red Texan Wolf.” The status of this animal is headline news today.
Red wolves were the canid that once inhabited most of the southeastern United States including all of Louisiana. In general, they are larger than coyotes with broader muzzles but much smaller than gray wolves of the American West. Like wolves everywhere they were ruthlessly pursued in predator control programs until their populations were decimated. By the 1960s the only remaining red wolves lingered in a small area of prairie along the Texas and Louisiana coast. By this time they were considered a distinct species, Canis rufus, and in 1973 were listed for protection under the Federal Endangered Species Act. Seventeen of the remaining wolves were captured to begin a captive breeding program, and the species was declared extinct in the wild in 1980. Subsequently, when the captive population increased red wolves were released back into the wild on protected areas in eastern North Carolina. Since that time they have survived but not thrived. About 50 to 75 now roam freely in that region and another 200 are in captivity at several places.
Bayou-Diversity (24 July 2016) WILDERNESS ESSENTIALS Less than three months after Union Parish was carved from Ouachita as a new political entity, William McKay died there intestate leaving a grieving widow and two-year old daughter. In 1839, Union Parish was essentially wilderness and sparsely populated, the surge of immigration by settlers from eastern states just over the horizon. McKay owned a store on the Ouachita River, either at what would later be called Alabama Landing or farther south at Ouachita City, or maybe even at the mouth of Bayou de l’Outre. In these roadless times goods moved efficiently only by water. To settle his estate McKay’s widow petitioned the court, and the judge ordered an inventory of the deceased’s possessions including the contents of his store. The results are enlightening.
Many of the items would be expected in a wilderness outpost far from civilization: rifles and shotguns with powder and lead for subsistence hunting; fishing line and hooks for the backwater bounties; palmetto hats to turn the sun; molds to produce hog and bear fat candles; broad axes, grubbing hoes; bone and mussel shell buttons; sugar and molasses; castor oil and patent medicines; playing cards, fiddle strings and Muscat wine. On the other hand, McKay’s customers could purchase imported Irish linen, embroidered lace silk gloves, velvet bonnets, Morocco shoes, fancy soup terrines, decorative chamber pots, Castile soap and tortoise shell combs, bathing tubs, newspapers, reading, spelling and song books, along with spectacles if needed. No doubt these items came upstream on steamboats via the international port of New Orleans.
Bayou-Diversity (1 May 2016) GIANTS AMONG US A saddled horse standing beside a giant eastern cottonwood is the subject of a nitrate-based cellulose negative given to me by the man who took the shot in 1938 while prowling about for ivory-billed woodpeckers in Louisiana’s vast Tensas Swamp. The tree appears to be nearly as wide as James Tanner’s sorrel gelding is long. Even in what then was the closest thing remaining to a large, old-growth bottomland hardwood forest in America, the tree in its size was an anomaly. Why else would Tanner, who had encounters there with panthers, wolves as shiny black as the back of a mud snake, and the mythical woodpecker that he actually held in his hands, waste precious film on a big tree?
Cottonwoods were minor components of eastern forests. In the lower Mississippi Valley their prime haunts are still the front land ridges of the batture, terrain now between the levees and the rivers. There, on relocated silt that once nourished big bluestem in mid-continent prairies, cottonwoods sometimes grew 190 feet above the sandbars. Tanner’s tree, typical of the species, represented disturbance. As a Goliath it also reinforced misconceptions concerning “virgin” forests. Such a giant buttressed romanticists’ oneiric ideas of primeval nature for a school of believers. In fact, cottonwoods are one of the fastest growing but short-lived eastern hardwoods. Tanner’s tree germinated when one of millions of seeds from a single female tree on the high bank of the Tensas River hit pay dirt after drifting under its cotton-like parachute into a recently abandoned plantation field.
Bayou-Diversity (20 April 2016) AN UNWELCOME ANNIVERSARY Six years ago today I was swept into the wild currents of an event that has proven to be the largest environmental calamity of its type in the history of man – the Deepwater Horizon oil spill in the Gulf of Mexico. Not long retired, I was recruited to help assess the impacts of the ongoing disaster on Delta and Breton National Wildlife Refuges near the mouth of the Mississippi River. Working out of a government facility at Venice we lived in an atmosphere electric with frenzied activity, excitement, and danger. At this end of the road port, hundreds of watercraft and thousands of people were being mobilized to attack an unseen enemy that was said to be approaching on distant waves. Even the president of the United States made an appearance with his imposing armada of helicopters. In a glimpse of irony, it struck me then that these mechanical birds were all painted the color of oil.
With the passage of time facts have emerged from the initial cauldron of chaos. The oil rig explosion killed 11 people and injured 17 others. More than 200 million gallons of crude oil leaked into the Gulf of Mexico over 87 days causing serious economic and ecologic damages to Louisiana, Mississippi, Alabama, and Florida. Thousands of birds, mammals, and turtles (some already endangered) were killed within six months of the spill. Some of the cleanup operations actually made things worse. A widely used oil dispersant was toxic to shrimp, oysters, coral, and phytoplankton. It was determined to be cancer-causing and produced mutations in fish, crabs, and shrimp. Clean-up workers were also affected by it. A subsequent study has determined that the dispersant increased the toxicity of the oil by 52 times. BP is now responsible for criminal and civil settlements of more than $42 billion.
Bayou-Diversity (11 April 2016) BAYOU MEMORIES I have early memories of a bayou that became a prominent geographical feature in my life. Sometimes I even think I know quite a bit about the stream and its attendant swamp. This bayou was allegedly named for someone in a clan of Frenchmen who had ties to the region. Some historians point to Jean Baptiste Darban or d’Arbonne, the son of Jean-Baptiste d’Arbonne of Natchitoches. Others think it was the ancestor of these men, Gaspard Derbanne, a Canadian hunter who traveled with Louis Jucherneau St. Denis to the Red River country in 1714. In any event, it is now labeled on maps as Bayou D’Arbonne, not to be confused with a lesser stream in St. Landry Parish called Bayou Darbonne but lacking the apostrophe in its correct spelling. With more than 400 named bayous in Louisiana, an apostrophe is relevant.
The French and other Euro-Americans were late-comers on the landscape. If the bayou were uncoiled and stretched straight to depict a time line, the original people would be noted first in the headwaters of the upper reaches, drifting downstream for thousands of years until contact with Caucasians somewhere near White’s Ferry, just a couple of miles above the mouth of the bayou. There, waters of the two cultures would roil with twisting currents for several hundred yards in time until the New World people evaporated as a race two centuries before flowing into the present.
Another approach to consider human time-in-place comparisons uses generational counts. Native people lived along Bayou D’Arbonne for 400 generations. After contact, they were contemporary with people of European and African ancestry for four generations before disappearing. As late-comers, we have now been present about nine generations.
Bayou-Diversity (28 March 2016) FLOUNDER, FROGS, SALT & YOUR THYROID A recurring theme in this Bayou-Diversity program involves our connections and links to the natural world. For today’s show consider this hypothetical scenario. A young couple decides to celebrate their anniversary by dining out at a popular seafood restaurant on a warm spring evening. The special of the day is stuffed flounder, which they both choose to try along with a side order of fried frog legs as appetizers. When their dinner is served it is sprinkled with salt to embellish the rich natural flavors, and the meal is indeed memorable. Within the various elements of this setting there is a common biological thread that links them all. It involves your thyroid gland.
The thyroid is a butterfly-shaped gland wrapped around the windpipe just below the Adam’s apple. It secretes several important hormones that regulate metabolic processes such as heart rate, blood pressure, body temperature, bone loss, and food movement through the GI tract. The hormones are especially critical during infancy and childhood for proper growth and development including that of the brain. The thyroid gland uses the element iodine to manufacture the vital hormones. To preclude iodine deficiencies and the ensuing thyroid-related diseases, iodine is added to most table salt.
As it turns out, humans aren’t the only species with thyroid glands as it is found in all animals that have backbones (vertebrates). However, the gland has different functions in different species. More than a hundred years ago a scientist fed ground up mammal thyroids to tadpoles and observed that they immediately developed into adult frogs. Their external gills disappeared, legs and eyes grew rapidly, and the tail was resorbed. When the scientist removed the natural thyroid from the tadpoles they never developed into frogs. So, the thyroid controls metamorphosis in frogs that result in fried frog legs on the platter. The stuffed flounder is entangled also. Flounders are a type of flatfish that also experience radical developmental changes. When young they are shaped as typical fish with eyes on opposite sides of the head. As they grow, one eye migrates to the other side, which becomes the top of the fish. This metamorphosis is also driven by hormones from the thyroid gland.
Bayou-Diversity (21 March 2016) PURPLE MARTINS Several years ago during the month of July, email messages between birdwatchers from throughout the state were buzzing about a remarkable natural phenomenon occurring in downtown Shreveport. It seems that purple martins decided to establish the largest communal roost of that species on the entire continent in several trees around the Barnwell Center.
We usually think of martins as spring birds and eagerly look forward to the arrival of the first scouts in early February. They readily accept artificial nest boxes and seem to thrive in the close company of humans. Native Americans were fond of martins and erected gourds as nest boxes long before Europeans arrived. Purple martins originally nested in tree cavities that were common before modern short rotation, industrial forest management. Competition from introduced house sparrows and starlings further reduced natural habitat. Despite thousands of artificial nest boxes, martins still suffer from a housing shortage.
Purple martins are a type of swallow, the largest in North America. Adult males are uniformly blue-black, and the females have dark backs and gray bellies. Their call is a rich, gurgling warble. Nesting usually begins in April when three to five eggs are laid in a nest of leaves and mud plaster. Incubation lasts for about two weeks and the young fledge a month later.
My brother and I decided to take a road trip to Shreveport to check out the electronic gossip. We arrived at the riverside Barnwell Center complex about 7:00 P.M. with nary a martin in sight. It was, however, quite obvious that something strange was going on. The nearby live oaks, shrubbery, plastic domed greenhouse, and sidewalks were covered with a white substance which we, as astute biologists, quickly determined not to be spray paint. Soon, lone martins appeared circling lazily on the afternoon thermals. People also started gathering, walking from distant parking lots even though ample parking was available nearby. Some were carrying umbrellas on this cloudless day. It was, as the news people like to say, “a developing situation.” Martins were becoming more common in every direction now as the sun slipped below the horizon. People began to leave the center of the park garden. Some stood under covered walk ways. As the light faded, a sense of urgency enveloped the area. Martins by the hundreds, thousands, tens of thousands, began whirling in circles with ever decreasing radii around us. It seemed as if troops of winged tornados were converging on a few acres of sacred ground. One landed in the tallest cottonwood, and soon the branches would hold no more. In descending order of height the nearby trees were smothered. More feathers than leaves covered the limbs. For twenty more minutes they reeled and swirled closer and closer to the earth until all were settled in the darkness.
In a few days they were gone, most on the way to Brazil for the winter. People who do such things estimated their peak number at 1,200,000 on July 30. This unforgettable spectacle raises questions. Where did they come from? Why did they choose these particular few acres in northwest Louisiana as a staging area? Where have they been in previous years, and will they return in future years? On a more personal level, how did I, sans umbrella, escape unscathed?
Bayou-Diversity (14 March 2016) WHIRLIGIG BEETLES A boyhood on the edge of a Louisiana swamp is fraught with danger, some real but most imagined. An example of the latter occurred when as adolescents my neighborhood gang would gather at the White’s Ferry Bridge to swim on hot, summer days. The event began as we jumped from the high bridge into Bayou D’Arbonne below. The older boys always warned us of the instant death that would befall us should we be so unfortunate as to do a belly-buster from that height. Next in the line of perils was the alleged, near-death experience of jumping into a swarm of whirligig water bugs that frequented the placid water of the bayou. Doubtless, they would be forced up into one’s cutoff jeans where in such an agitated state they would bite and sting any and all available, sensitive flesh. We thought about these things a good bit.
Bayou-Diversity (18 February 2016) FEATHERS What does a chickadee at your bird feeder, a tyrannosaurus that lived in northeastern China 175 million years ago, and a tragic 16th century play have in common? That the chickadee is covered with feathers is not surprising, but finding the richly detailed plumes on the fossil of a Jurassic dinosaur seems a bit incongruent. Feathers are made of a special group of proteins called keratins. During development, the proteins bond into twisted sheets that result in microscopic structures similar to but stronger than those found in the hair, claws, and horns of mammals. The job of feathers on modern birds is to provide insulation from cold temperatures in both air and water. Proto-feathers found on dinosaurs served the same function. Feathers allow birds the remarkable concept of sustained, controlled flight, a phenomenon shared only with bats and some insects. Feathers also play important behavioral roles in the lives of birds during courtship and defense of territory.
The significance of feathers for humans is cross-cultural and spans the globe. They have adorned the bodies of British queens, Aztec kings, and New York socialites. They are used in the religious ceremonies of Native Americans and in snakebite medicine by East Asians. Feathers are fashioned into fishing lures for anglers and regimental headdresses for generals. They have been stuffed into mattresses during times of peace and fletched on arrows for war. Feather quill pens yielded the U.S. Constitution, the novels of Jane Austen, and the complete works of Shakespeare. Paleontologists consider the discovery of feathered dinosaurs further evidence of kinship between those reptiles and the ancestors of birds, thus the connection between an oriental tyrannosaur, a Carolina chickadee, and incidentally Romeo and Juliet.
Bayou-Diversity (7 February 2016) ROOSEVELT, THE BEAR & A SILVER SPOON President Theodore Roosevelt was frustrated when he arrived in East Carroll Parish, Louisiana in October 1907. An avid hunter, he had long desired to kill a black bear on a traditional southern hunt with baying hounds and moss-draped swamps as a backdrop. His first effort in Sharkey County, Mississippi five years earlier had been unsuccessful except for spawning the iconic Teddy Bear stuffed toys when he refused to shoot a young bear that had been tied to a tree by his hunting guide. Now after a week of unrewarded effort in East Carroll Parish, Roosevelt began to grumble that maybe they were in the wrong location. His infamous guide, Ben Lilly, agreed and the hunters moved about 15 miles south to Bear Lake in Madison Parish. There on the 13th day of the hunt the dogs bayed in a dense canebrake and the president got his trophy.
After a day of rest the hunters broke camp and Roosevelt rode back to his waiting train. On the way he spent the night at a nearby plantation managed by Mr. and Mrs. Leo Shields. During supper that night Mr. Shields mentioned the need for a local post office as they were then dependent on mail via Mississippi River steamboats. The next morning Roosevelt departed on the train, and for a short way the Shields’ two-year old daughter rode on the president’s knee. Soon after the visit a post office was authorized for the area and promptly named Roosevelt by the local people. A historical marker on a barren stretch of U.S. Hwy. 65 is a lone reminder of the event.
In 1987 my wife, Amy, interviewed the Shields’ daughter who was then 82 years old and known fondly as Poche or Mrs. W.Z. Adams. She was of course too young to remember the story when it happened, but her family related it to her many times when she got older – and she had hard evidence. Several months after the president’s visit, Poche received in the mail a silver spoon embellished with a Teddy Bear (similar to the one in the photo). Amy held the spoon and noted that it was inscribed “To little Mip Agnes Tabitha Shields with all good wishes for her future from Theodore Roosevelt, October 21, 1907.” According to Poche, “Mip” was a term of affection used for small girls.
In hindsight, had the bear been a bit faster, Roosevelt may not have been as amenable in doling out his post office and silverware in northeast Louisiana.
Bayou-Diversity (2 February 2016) WAR, WORMS & WHITE MULBERRIES The Civil War may be indirectly implicated in the continuing devastation of American forests by an army of insects proven to be less stoppable than those of the Union or Confederacy. When cotton from Louisiana and other southern states became unavailable in the north Leopold Trouvelot, a Boston naturalist, accelerated his research into producing a viable silkworm for the northern textile industry. It led to his infamous, late 1860’s importation of gypsy moth eggs from France in an effort to cross breed them with silkworm moths. Because the two insects were only distantly related, they could not interbreed and the experiment failed. Either accidentally or intentionally, gypsy moth caterpillars were soon released into a hospitable environment and became the gypsy moth plague that causes damages valued in the hundreds of millions of dollars to North American forests each year.
The intended host plants for the silkworm caterpillars were native red mulberry and white mulberry, an introduced Asian species that serves as the foundation of silk production in other parts of the world. Promoted by the U.S. Government, white mulberry was widely planted before the Civil War in an unsuccessful effort to develop a domestic silk industry. Like the gypsy moth, white mulberry has become an invasive species with negative ecological impacts on natural areas. It hybridizes with and transmits disease harmful to red mulberry and displaces other native vegetation. So, instead of a viable silk industry in the United States we ended up with economic, aesthetic, and ecological havoc in the forests of eastern North America as lingering impacts of a civil war that just marked its sesquicentennial. For the environment too, war is hell.
Bayou-Diversity (10 January 2016)BAD IDEAS When it comes to the natural world, we don’t know what we don’t know. Trouble jumps up about the time we think we’ve got it all figured out. There are plenty of examples of well-intentioned human actions that have caused environmental chaos. One pertains to recent attitudes concerning wild fires. For a century fires on natural landscapes were thought to be unmitigated disasters. Tremendous efforts went into fire prevention and suppression across the country. Smoky Bear taught generations of children that fire is bad. This ill-informed position, by failing to recognize that fire is a natural part of many ecosystems, has led to very unnatural conditions in many regions. The consequences are that some plants, with animals that depend on them, have almost disappeared because they can’t live without occasional fire in their habitat. Some seeds don’t germinate unless released by heat. Prairies turn to shrubby thickets if not kept in check by fire. When fires do occur in areas after long periods of fire suppression they often are so hot as to cause serious environmental damage.
Another example involves predator control. For many years governments had formal programs to eradicate predators that were thought to compete with human interests. By shooting and with the aid of poisons large predators were totally eliminated from much of the country. Only recently and with continuing controversy has the healthy roll of predators in an ecosystem been recognized even by professionals in the field. These predators can range from gray wolves in the American West to alligator gar in Louisiana bayous.
The list of other bad ideas is long and includes the intentional introduction of invasive species such as kudzu and Chinese tallow without thinking of the consequences. Likewise, levees along the Mississippi River in south Louisiana were built for flood protection without ever considering that they would contribute to the loss of our state’s critical wetlands. Until we recognize as a society that we don’t know what we don’t know, and that good science is the path to new knowledge, we will continue to be surprised by our blunders.
Bayou-Diversity (15 December 2015) LOUISIANA BISON The image of thundering herds of buffalo racing across endless prairies is not one that is often associated with Louisiana, the Bayou State. Historically, though, the scene is not far-fetched.
The animals we call buffalo are more correctly termed bison to separate them from true buffalo of Africa and Asia. Early French explorers in Louisiana called them boeuf sauvage – wild ox. Formidable in appearance, the bulls stand six feet high at the pronounced shoulder hump and weigh as much as a ton. Both sexes have a massive head, neck and shoulders, and are robed in a thick, wooly pelage. They were the largest land animal to inhabit Louisiana in historic times.
That they did indeed live in Louisiana is well documented. Our maps denote three Bayou Boeufs, Boeuf River, and Boeuf Lake. As part of the continental “southern herd” they ranged across most of the state at least part of the year but not likely in tremendous numbers associated with those of western and northern prairies. Bienville reported killing a bison near what is now Winnsboro in 1700. Penicaut wrote of shooting 23 bison at Bayou Manchac in 1712. Other 18th century accounts mentioned bison near present-day Baton Rouge and New Orleans. By 1800 bison seem to have been almost eliminated from the state’s list of magnificent fauna. One early historian wrote that “The last buffalo seen in the neighborhood of Fort Miro [now Monroe] was killed in 1803.” This pattern continued for the next hundred years until the entire continental population, estimated at 60 million, was market-hunted to near extinction. Bison are found today in Louisiana in a few small captive herds scattered around the state.
Bayou-Diversity (1 December 2015) PALMETTO During the Civil War southern white women were often deprived of store-bought goods. Hard times required that they adopt the creative strategies of hapless slaves for basic necessities. Manufactured hats in particular were scarce as all production was geared to outfit southern soldiers constantly exposed to the elements. As a result domestic millineries cropped up in countless households. The most common raw product used to produce thousands of hats was a type of palm that we call palmetto.
Along the eastern seaboard cabbage palm is the dominant palmetto. Its fan-shaped leaves grow on tall straight trunks to eighty feet tall. Inland from the gulf coast including all of Louisiana, dwarf palmetto is most common. In this species only the characteristic leaves are above ground, the stem being buried. It is usually less than six feet in height. The attractive pale flowers yield hard black fruits eaten by birds and raccoons.
Landscapes with dense stands of palmetto are memorable. A refugee traveling through the Boeuf River Swamp of northeastern Louisiana in 1863 wrote in her diary: “For a mile the road was a beautiful avenue through this forest, then immediately the character of the scene changed, the large beautiful trees were still there, but around their roots the palmetto grew thick, one who has never seen it can have no conception of the effect, the scene was tropical indeed, from the forest we emerged into an open space covered thick with glossy dark green fans of palmetto.”
Another woman in Morehouse Parish described the local situation: “The seclusion and inaccessibility of the place made it difficult to obtain very elaborate wearing apparel. Palmetto grew abundantly and luxuriantly around our home, and we became experts in weaving it into hats which were very pretty and unique. The palmetto was gathered and then boiled. The boiling process bleached it perfectly white, and made it soft and pliable, thus adapted to the use we made of it.”
Soldiers, too, used the palmetto plant for a variety of purposes from building material to screens for camp latrines. None were more inventive than hat-making by the women back home.
Bayou-Diversity (15 November 2015) PECANS To me, the word “PEE-can” is synonymous with the chamber pots of days past. However, a national survey conducted in 2003 finds that “PEE-can” over “pa-KAWN” is the overwhelming choice among Americans. I’ll not conform to the majority.
The name “pecan” is actually of Native American origin and was used to describe nuts that required a stone to crack. Pecans are in the hickory family and grow naturally along the river bottoms of eastern North America and south into Mexico. Old, wild trees can exceed 100 feet in height and three feet in diameter. The well-known fruit of pecan trees was an important food for humans and wildlife for thousands of years before the first Europeans clanked ashore.
Native pecans exhibit great variety in nut size, shape, thickness of shell, and ripening date. Within this diversity an occasional highly desirable, wild tree was discovered with unusually large, thin-shelled, sweet nuts. In 1846, a Louisiana slave named Antoine successfully grafted one of these superior wild pecans onto a typical stock. His clones went on to be honored at the Philadelphia Centennial Exposition of 1876, and became the first official plantings of improved pecans. The successful use of grafting techniques led to grafted orchards and the widespread commercialization of pecan production. Today, there are over 1,000 varieties of pecans with more than 300 million pounds produced annually in the United States.
1704 was a rough year for Bienville’s young Louisiana colony in New Orleans. Overdue supply ships from France resulted in a food shortage, and to stretch the remaining provisions Bienville released many of his men to go into the woods and live among the Indians until relief arrived. Andre Penicaut, a master carpenter, was one who left and traveled upriver to stay with the Natchez tribe. There, to his delight, he was introduced to a nut, which he described as “scarcely bigger than one’s thumb.” According to his spelling the Indians pronounced it “pacane.” (Adapted from Bayou-Diversity: Nature & People in the Louisiana Bayou Country, LSU Press)
Bayou-Diversity (15 October 2015) EYESHINE In my family there are stories about lean times during the Depression when rabbits were a welcomed source of protein in the household larder. Most were shot at night with the aid of a carbide lantern. Rabbits were detected by their eyeshine in the dim glow of the light. Boys, new to the venture, were reminded that because rabbits’ eyes are on the side of their head, only one eye could be seen at a time. And if, when walking through the lonely swamp at night, a person were to detect a creature with two eyes shining, he should remember that such physiology is a trait of many predators that can see much better at night than a mere boy.
The cause of much hope and apprehension during these undertakings was a cluster of highly refractive crystals behind the retinas of the shining eyes. Known as tapetum (ta-PEA-tum) lucidum, these organs make the pupils of some animals appear to glow when struck by an outside light source. Animals with the brightest eyeshine usually have more rods and fewer cones in their retinas resulting in excellent night vision but also color-blindness. Not all animals have a tapetum or eyeshine. Humans don’t. Those animals that do have eyeshine tend to be mostly nocturnal and include many mammals but also spiders, some fish, frogs, and alligators. The color of eyeshine also varies by species. Horses have blue eyeshine, fish have white eyeshine, and that of the possum and many rodents is red. The eyeshine of cats and canids, which include cougars and wolves is yellow, a fact not lost on my hungry kinfolks when they spotted two glowing orbs in the heart of D’Arbonne Swamp.
Bayou-Diversity (30 September 2015) DROUGHT From our place on the edge of a Louisiana swamp I can smell the drought. The usual organic brew of odors is absent; now it smells like northern New Mexico in early autumn – like a toddy of weathered adobe and rabbit bush resin. It is almost October and we have had ½ inch of rain since the 4th of July. NOAA’s Drought Severity Index considers the north half of the Bayou State in severe drought – only one step down from the tinder box that is California.
The impacts are compounding daily. There is mortality in my yard – a bed of Christmas ferns, a feeble red oak, and a sourwood I planted twenty years ago. Those dogwoods that have survived the anthracnose are on life support. The bayou down the hill from my house languishes currentless at pool stage or below. On my walk there this morning the heavy clay soil was cracked into puzzle pieces. At least a dozen cat squirrels raced across my path after drinking at the water’s edge. Needles on the cypress trees are oranging prematurely. I watched a dishpan-sized snapping turtle root in the mud of a small, clear pond like a Guinea hog as his world evaporated by the moment.
This drought is not without precedent. One of the worst recorded in Louisiana occurred in 1896 when part of the state was rainless for almost seven months. Wells went dry. Truck crops failed and it took ten acres to grow a bale of cotton. Farmers in the hill country drove their cattle to Lake Bistineau and then it dried up. The New York Times and the Chicago Tribune recorded the disaster.
As I write, cumulus clouds in promising shades of charcoal drift in from the east. But they are wayworn, lacking intent, and serve only to confine the humidity at ground level. They are Nature’s mockery of human vanity, like the high water marks 15 feet up the trunks of willow oaks on my morning walk.
Bayou-Diversity (15 September 2015) WASH POTS In retirement they seem innocent enough, often sitting quietly in the side-yard holding bouquets of pansies. Back in their day though they were instruments of hard manual labor, especially for Louisiana women who dreaded their weekly encounters. For them, cast iron wash pots were undesirable necessities.
A review of estate inventories during legal successions reveals that wash pots may have been one of the most commonly found items in 19th century Bayou State households. The typical pot was about 18 inches in diameter with a rounded bottom. It held about 20 gallons of water. Three short, stubby legs when placed on rocks balanced the kettle, and a pair of opposing iron loops on the rim could support the pot if hung by a chain. The exterior was always charred sooty black from the fires that heated the contents.
It was called a wash pot for obvious reasons. More than anything else it was used to wash clothes. Wash day was a laborious ritual that involved building and maintaining a hot fire under the pot so that clothes could be boiled before undergoing a series of rinses in nearby tin tubs. Accessible water was a necessity as each washing required several pots of heated water. Near my house local women once gathered at a clear, flowing spring to wash.
Wash pots had other uses as well. At hog-killing time water was boiled in the pot and poured into a drum in which a freshly slaughtered hog was immersed. The hot water sterilized the pig and loosened the hair for removal. When the hog was butchered the scraps were thrown into the wash pot to boil, rendering the fat and yielding cracklins that floated to the surface. Sometimes a small can of lye was added to the fat and the result was lye soap, another household necessity.
By the 1930s mechanical washing machines became common and the prevalence of cast iron wash pots began to diminish. History has not recorded one incident of a Louisiana woman lamenting this occasion.
Bayou-Diversity (1 September 2015)TREE RINGS One day a forester walked into an unfamiliar patch of woods. She chose a medium-sized white oak tree as a subject, collected a sample, and returned to the lab. In a couple of days she drafted the following history of the tree.
“The white oak sprouted from an acorn in the year 1885. For the first twelve years of its life the tree grew slowly as a result of being shaded from sunlight by large trees nearby. In 1897 the closest large tree, perhaps a parent of the sapling, blew over in a spring storm and allowed sunlight to reach the young tree. It grew rapidly for the next seventeen years. Then, beginning in 1914, a severe drought slowed growth for three years until favorable precipitation returned to the area. For the following forty-two years growth was normal. In the fall of 1959 a fire raged through the forest severely injuring the white oak. It survived because of its thick bark but barely grew at all for eight years as a pathogenic fungus attacked through the fire scar. In 1963, a neighboring tree to the east fell hard against the white oak causing a permanent lean to the west at a thirty-degree angle. At the time of this sampling in 2015 the tree is 130 years old.”
Although this story is hypothetical, it is typical of many life histories of trees that are determined through the science of dendrochronology. In temperate climates trees form growth rings in response to changing seasonal conditions. Each ring has two parts: a wide, light part called the early wood, and a narrow, dark part known as late wood. The early wood is formed during the wet, spring growing season. The late wood forms during the drier transition period from summer to fall and winter when growth slows. By studying the rings, information about the climate over a period of time and evidence of environmental disturbances such as fires and floods can be learned. The shape and width of the annual rings differ from year to year because of varying growth conditions. A ring formed in a wet favorable growing season may be very wide, while rings formed when the tree is stressed will be much narrower. Fire scars and insect damage are often visible in the rings.
To study a tree’s growth rings without harming the tree, scientists use a technique called coring. A hollow tubular instrument known as an increment borer is used to drill into the center of a tree trunk and extract a narrow cylinder of wood. Growth rings on this core sample appear as lines that can be counted, measured, and studied for abnormalities. Similar observations can also be made by examining the stump of a freshly cut tree or the end of a sawn log.
By studying tree rings in very long-lived species such as baldcypress and overlapping data from living trees with that obtained from old fallen logs, climate, fire, and flood histories can be developed for an area that go back more than 2,000 years. This information helps us understand how forests change over time, and in some cases can be used to predict the frequency of future fires and floods.
So as you enjoy the shade tree in your back yard, remember that history and lessons for the future are being recorded season by season just under the bark. (adapted from Bayou-Diversity: Nature & People in the Louisiana Bayou Country, LSU Press)
Bayou-Diversity (27 August 2015) BAYOU STEAMBOATS Had you been sitting on the bank of Bayou Bartholomew several miles below Bastrop on the afternoon of December 13, 1857, you would have heard her piercing scream long before she came into view. Heavily laden with cotton bales, the steamboat W.W. Farmer eased cautiously along with the current. Water levels were rising but still low. The first boat of the season had been able to enter the mouth of the bayou from the Ouachita River only nine days before. The Silver Moon, Lucy Robinson, and YoungAmerica were also trading up and down the sinuous stream so narrow that two boats could barely pass. Navigation was treacherous. In two months the Red Chief would lose a smokestack here on an overhanging limb. In two years the Princess would lose a boiler and liberate the souls of nearly two hundred passengers. Lookouts on the Farmer watched for sparks from the stacks and quickly doused any that settled on the incendiary cotton bales.
Coming upstream a couple of days earlier, Farmer’s steam whistle had announced stops at the numerous plantations and other landings. Mail, freight and Christmas orders, mostly via New Orleans, were off-loaded. Wealthier customers received crates of iced oysters fresher than those in today’s local markets, and fine cloths from Europe. Apples and oranges were also treasures in this emerging pioneer world. Yeoman farmers picked up staples such as flour and coffee, and necessities like plow harnesses and tobacco.
This scene was being repeated in smaller streams across northeast Louisiana. Steamboats worked Boeuf River to Point Jefferson, the Tensas River as far as Waverly, and Bayou D’Arbonne above Farmerville. Flood control and navigation projects on these waters were decades in the future. Commerce and life in general revolved around the cyclic, nourishing floodwaters.
The concept of manifest destiny as it applies to nearsighted efforts to control natural processes eventually overwhelmed most of the smaller waterways. Dredging and straightening converted much of the Boeuf and Tensas Rivers into manmade plumbing systems. Bayou D’Arbonne was dammed. Some good came of these projects but rarely at the levels predicted. Prophesied benefits to commerce seldom materialized, and one hundred year floods ignore the calendar with increasing frequency. Aquatic wildlife populations took a beating. Several taxa of fish disappeared when critical streamflows, water quality, and bottom substrates were altered.
There are still semblances of wild bayous in the area. The captains of the W.W.Farmer and other such vessels would recognize Bayou D’Arbonne below the dam, Tensas River within the national wildlife refuge, and the first few miles of Bayou Bartholomew. There is no good reason not to keep them so. (Adapted from Bayou-Diversity – Nature & People in the Louisiana Bayou Country, LSU Press)
Bayou-Diversity (30 July 2015) SLEEPLESS NIGHTS Eighty years ago wherever there was freshwater habitat in the state of Louisiana, it would have been difficult to sleep during the warm nights of May. The booming territorial choruses of our largest frog, said to resemble the roaring bellows of bulls, were common. Now greatly diminished in numbers throughout their range, bullfrogs are native to the eastern half of the United States.
Very large bullfrogs can weigh almost two pounds and have head/body lengths of eight inches. Females are larger than males. Their breeding season lasts about two months and peaks in May in Louisiana. During this period bullfrogs congregate as females are attracted to the calling males. When a female selects a mate she lays up to 20,000 eggs in nearby aquatic vegetation. They are fertilized externally by the male and soon hatch into tadpoles. In northern latitudes the frogs may remain in the tadpole stage for two to three years, but in Louisiana most develop into frogs within a few months. Young frogs grow rapidly and adults are voracious predators eating any live animal they can capture and subdue. Insects and crawfish are major food items but they also eat fish, snakes, birds, mice, bats, and other frogs. Bullfrogs are themselves the natural prey of snakes, fish, raccoons, egrets, and herons.
During the first half of the twentieth century bullfrogs were a valuable commodity in Louisiana. Most towns in the state had agents who purchased frogs for larger companies. Thousands of people hunted frogs at night and were paid up to $3 per dozen for live frogs. By the late 1920s better restaurants in Chicago, Philadelphia, and Boston were serving Louisiana frogs in a dish labeled frog legs ‘a la Newberg.’ The market may have peaked in 1935 when 2.5 million pounds of frog legs were collected statewide. Such a harvest was not sustainable and frog populations began a decline from which they have never recovered. Since then bullfrogs have been introduced into many countries around the world and are even considered invasive pests in some areas. Frog legs now served in American restaurants are most likely imported. In Louisiana, overharvest and the loss of critical wetland habitat have insured less raucous spring nights in our swamplands, a deficit not inconsiderable for some of us.
Bayou-Diversity (12 July 2015) TIGER OWLS At the very mouth of the Mississippi River there is a small island that once served as the headquarters of Delta National Wildlife Refuge. A surplus fire tower was erected on the site in order that the wardens might watch for poachers in the vast flounder-flat marshes of the delta. A friend who worked there once told me that for several years the tower was deemed unsafe and off-limits for a couple of months each winter. It wasn’t because of high winds or lightning storms that the 100′ tower was condemned but rather the presence of birds that some people called Tiger Owls. This backwoods moniker was attached to great horned owls by people knowledgeable of their innate fierceness. Great horned owls are found across most of North and Central America and a large part of South America. Indeed in many areas they are the apex predators of the skies.
Great horned owls are found throughout Louisiana but are not as common as the smaller barred owls and diminutive screech owls. They can stand almost two feet tall with a wingspan greater than four feet. Mottled and striped in brown streaks with large yellow eyes, they are named for two prominent ear tufts. Their calls are low, haunting hoots that mean business when they are defending territory.
Great horned owls use keen senses of sight and hearing to hunt their prey – almost always at night. Formidable talons coupled with modified flight feathers for silent approach make them stealth predators of darkness. Their list of prey includes rabbits, squirrels, skunks, armadillos, reptiles, other birds, and even young foxes and coyotes. In many places they were once considered outlaw birds because of their habit of occasionally killing poultry. The fact that they also consumed untold numbers of destructive rodents was not considered. Old Louisiana hunting regulations stated that they “may be killed at any time.” Now they are rigidly protected by Federal and State laws.
Adults generally have no natural predators, and most mortality is now human-related. Owls are killed by collisions with cars, buildings, and power lines. Less frequently they are still poisoned, trapped and shot.
In Louisiana, nesting begins in December or January, among the earliest of all birds. They do not build nests per se but rather use abandoned hawk, crow, or squirrel nests to lay their two or three eggs. When suitable nests of other species are not available to confiscate they will use large tree cavities or, as in this case, a fire tower in the marsh. At this critical time in their life cycle they are most fierce and will defend their nest “like tigers” even from well-intentioned game wardens.
Bayou-Diversity (26 June 2015) INVISIBLE STREAMS All around us, especially in the hottest dog days of summer, a silent sucking sound permeates the oppressive humidity. It is the water in plants being pulled from the roots to evaporate through microscopic openings called stomata on the bottom of leaves. The process is transpiration, and it is most dramatic when considered on the scale of trees. A large oak in your yard can release hundreds of gallons of water on a hot, dry day, up to 40,000 gallons in a year. Plants release about 10 percent of all the moisture in our atmosphere; the rest comes from ocean evaporation. The amount of water lost by a plant depends on its size, temperature, humidity, wind speed, and soil moisture content. Transpiration serves three critical roles in plants: the water movement provides an avenue of transport for minerals and food throughout the plant; it cools the plant (and incidentally humans, as 80 percent of the cooling effect of a shade tree is from the evaporative cooling of transpiration); and it maintains turgor pressure in cells, which allows plant parts to remain firm and upright. When the amount of moisture in the soil fails to keep up with the rate of transpiration, loss of turgor pressure occurs and the stomata close. Transpiration plummets and the plant wilts. Simply put, when your dogwood looks hang-dogged it’s because the soil under it is too dry to support normal transpiration, and the tree struggles to adapt by entering a survival mode. On a Louisiana summer day it takes only a bit of imagination to hear the tons of water slowly moving up through roots and tall trunks and out the tiny leaf openings to collectively coalesce into a small cumulus cloud, upon which we base our hopes of a cooling shower. (Adapted from Bayou-Diversity: Nature & People in the Louisiana Bayou Country, LSU Press)
Bayou-Diversity (14 May 2015)EAST CARROLL ODES People who don’t live in East Carroll Parish, Louisiana go there for various reasons. Most are likely passing through on Highway 65 heading north or south for destinations far from the rural, agrarian landscape. It’s been that way for a while. Certainly during the Civil War General Grant had no intention of lingering when he set up shop there and impressed the local slaves to dig a canal through Sharkey Clay soils in order to bypass Vicksburg and the entrenched Confederate army who were aggravating the dickens out of Yankees trying to float past their fortress above the Mississippi River. But I digress. Of the modern visitors few show up on motorcycles, especially one made in Germany. However, I expect that once in a while it happens. Surely, though, no one has ever gone to East Carroll Parish on a German motorcycle for the reason I did recently. I was conducting a census for the University of Texas. It had nothing to do with the demographics of the poverty-stricken parish or the forecast of cotton and corn yields after the wet spring. I was merely documenting the presence or absence of the likes of widow skimmers, swamp darners, citrine forktails, and wandering gliders. Of course these names belong to dragonflies and damselflies. It seems that of the 64 Louisiana parishes none have fewer documented species of these insects than East Carroll – eleven to be exact. This compares to 64 species found in East Feliciana Parish. Why so few species in East Carroll? Probably because not many people have searched for them. The lack of habitat diversity in the chemical-laden sea of agriculture may also be a factor. I am sorry to say that my survey did not increase the known species list, but I am encouraged and will try again. Lest you think this is some esoteric scientific study funded by taxpayers, be assured that nothing is farther from the truth. It depends on volunteer citizen scientists. Oh, as for the German motorcycle – it was my conveyance of the day only because it gets 65 miles per gallon.
Bayou-Diversity (18 April 2015) NOT REALLY POVERTY POINT – This hallowed place is not Poverty Point. It has a name that we cannot know, cannot imagine, perhaps that our modern tongues cannot pronounce. It is a name that will never be spoken again.
The people of this place shaped their world with switch cane baskets, stardust, and a cosmic blueprint beyond our comprehension. Six mounds, six ridges – enigmatic architecture that makes profane strip malls and fast food joints.
Their larders were forests of persimmon, pawpaw, and pecan; rivers of catfish, buffalo, and drum. They cooked with fired earth and left the swirls of their fingerprints for our imaginations to misinterpret.
In their mind’s eye from atop the big mound even the old people with cataracts could see 500 miles to quarries of galena, flint, quartz and soapstone. Beckoned by shamans, treasure from these places drifted downstream to the ridges.
Ancient human bones are nowhere to be found on the site. Did the small clay heads speak of burial taboos? Should we know that the tiny red owls called for inherent sacredness in such a setting?
Before the birth of this place, before the flowering of earthworks, 260 generations flowed across this landscape absorbing the wisdom of time in place. Along the same bayous we are as newborns in all that matters.
Bayou-Diversity (8 April 2015) A STEEL-WIRED NEST? Spring is a busy time for birds in Louisiana. Whether they are year round residents or just returning from wintering areas in Central and South America, most are involved in nest building of some sort. Nests are as varied as the many species that frequent our locale. They can be found from ground level to the tops of the highest trees. They can be as simple as a depression in the leaves or as complex as a finely woven bowl of spider silk and lichens.
Most people think of the typical nest as the familiar cup-shaped structure built by many songbirds. Red-tailed hawks and great blue herons, however, build platform nests of sticks and twigs; white-eyed vireos build hanging cup nests from a tree fork; barn swallows and phoebes plaster their cup nests to a vertical wall (usually under bridges in our area); and Baltimore orioles weave bag like nests suspended from branch tips.
Nest locations also vary. Killdeer lay their eggs on the bare ground of gravel parking lots or the flat roofs of buildings. Vultures build nests in hollow logs or abandoned structures. Kingfishers and bank swallows burrow into the sandy banks above our waterways to nest. Several species of woodpeckers excavate holes in dead trees. Other birds like the tufted titmouse, bluebird, prothonotary warbler, and wood duck also nest in cavities created by woodpeckers or other animals.
In constructing a nest most songbirds use a foundation of twigs interwoven with grass, strips of bark, dead leaves, pine needles, mosses, animal hairs, or feathers. Robins and wood thrushes use mud to glue their nests together. Cliff swallows build their nests entirely of mud. Chimney swifts and hummingbirds secrete sticky saliva to cement nest materials. For unknown reasons the crested flycatcher and tufted titmouse routinely use cast-off snake skins to line their nests. Other odd materials occasionally show up in bird nests. A five-dollar bill was found braided into a brown thrasher’s nest and a raven in Texas built a nest entirely of barbed wire.
Bird nests in Louisiana vary from the one inch diameter hummingbird nest in a white oak to a thousand-pound bald eagle nest in the fork of an ancient cypress. My favorite is that of the common and perpetually busy Carolina wren. They are infamous for stuffing every available orifice with nest material. Not long ago researchers at Barksdale Air Force Base found a wren nest in a deactivated ICBM missile. Now is that optimism or what? (adapted from Bayou-Diversity: Nature & People in the Louisiana Bayou Country, LSU Press)
Bayou-Diversity (29 March 2015) BACKWATER Few people in Maine, Wyoming or California can relate to the term “backwater” like those who live in bayou country. It refers to the natural, cyclic overflow of rivers and bayous that inundates areas characterized by bottomland hardwood vegetation. Backwater generally occurs in winter or spring in response to heavy, seasonal precipitation on local watersheds or as far away as the upper tributaries of the Mississippi River. The key word in this definition is “natural” because backwater has created much of the land that we know here and continues to shape the flora and fauna.
Backwater dictates the type of plants that grow in overflow areas by replenishing shallow water tables to insure that only species adapted to live in wetlands can survive. Pine seedlings frequently invade swamps during dry cycles only to be killed when the floods return. The rising and falling waters disperse floating fruits and seeds of mayhaw, overcup oak, water hickory, and cypress to provide diversity throughout the ecosystem.
From longnose gar to largemouth bass, backwater is the key to many fisheries by providing critical spawning habitat. Backwater allows the temporary passage of fish from one oxbow lake to another, again ensuring diversity down to the genetic level. Native terrestrial wildlife have adapted to the floods, routinely following the water in and out of the swamps. Slowly rising waters cause few problems for most species if suitable habitat is available in nearby uplands. Deer along the Mississippi River give birth to fawns up to two months later than those in nearby hills, perhaps to avoid backwater at a critical time.
The most important function of backwater is likely the infusion of nutrients to fuel the system from the bottom up. Several hundred thousand acres of former backwater areas in Louisiana never or rarely flood because of levees, ditches, pumps and dams. Most have been converted to agriculture. Even in remaining forested areas the cycle is broken, and the land is never as productive. Nutrient deficient plants eventually produce less fruit, acorns, and browse, lowering the carrying capacity of the deer herd. Lack of flooding results in fewer fish and crawfish to support great blue herons, raccoons and otters. The absence of backwater means less seed and animal dispersal and thus less diversity. When diversity decreases to a finite point, ecosystems often implode and cease to exist as a sustainable unit.
For thousands of years humans adapted to backwater and even exploited its benefits without altering the natural phenomenon. Only in the last hundred years has man developed the tools to change the environment of Louisiana at a landscape level. At some levels in some areas we may be progress poor. (Adapted from Bayou-Diversity: Nature & People in the Louisiana Bayou Country, LSU Press)
Bayou-Diversity (17 March 2015) LOUISIANA MAHOGANY? The wood of mahogany trees makes some of the most valuable lumber in the world. Cherished for its beautiful luster and resistance to rot, mahogany is native to Asia but it grows unappreciated in our area. It is found in the yards of old house places, especially those of tenant farmers in the delta lands. The Chinaberry tree is a type of mahogany with wood just as attractive as that found in fine furniture. Introduced to North America in the late 18th century and having no natural enemies, it has colonized the southern half of the United States and up the eastern seaboard. Leaf litter from Chinaberry causes the soil to become more alkaline and discourages other plants from growing nearby. The tree was often planted around houses because it grows fast and provided shade in a sea of cotton fields. Rural people used the yellow marble-size fruit of Chinaberry to make whiskey and soap. The bark of the root was used to treat intestinal parasites and the leaves were said to discourage bott fly larvae in horses. The actual benefits of these Chinaberry products and home-grown remedies may have been more harmful than helpful because the berries and other parts of the plant are moderately toxic to humans and livestock. Even today Chinaberry poisoning occurs, with pigs and dogs most often reported. Birds, however, seem immune to the poison and only exhibit varying degrees of intoxication after over-indulging in the fruit. Modern medical research indicates that a product in Chinaberry leaf tissue may be effective in treating the human herpes virus, something the delta sharecroppers could not have imagined when they planted the trees as a respite from the southern summer heat a hundred years ago. (Adapted from Bayou-Diversity: Nature & People in the Louisiana Bayou Country, LSU Press; tree photo by Ron F. Billings)
Bayou-Diversity (8 March 2015) MAY-APPLE & CANCER When my dad was a boy tromping about the red clay hills of Union Parish an odd looking herbaceous plant always foretold the coming of spring. May-apple, sometimes called mandrake, poked its umbrella-shaped leaves up early to capture vital sunlight under the naked hardwoods before being sentenced to shade for life. Once common in moist, fertile soils throughout the eastern United States, may-apple has declined in the South under the advance of diversity-squelching pine plantations. The remaining plants are found in clumps and grow to about 18 inches tall. A single white flower blooms locally in April and later forms a crab apple size fruit. By late summer all above-ground evidence of this delicate perennial has vanished in the sub-tropical heat.
Native Americans were the first to recognize the uses of may-apple. The fully ripe fruit is edible and was once made into jams, jellies and pies. All other parts of the plant are poisonous to some degree. Indians used the root to treat internal parasites and as a strong laxative. The cathartic properties were valued later when it became a component in Carter’s Little Liver Pills. Today may-apple and a closely related Asian species are best known in the medical field for a chemical found in the roots called podophyllotoxin. This very strong plant alkaloid is thought to protect may-apple from insects and other herbivores. Acutely toxic it is now an active ingredient in a drug used to treat lung cancer. During chemotherapy it inhibits the activity of an enzyme necessary for cancer cells to replicate.
May-apple still grows in my heavily forested yard in Union Parish, but I see it in a different light. On the morning that I wrote this piece it flowed into my father’s ailing body through an IV port. It was his chance to enjoy the coming spring once again. (Adapted from Bayou-Diversity: Nature & People in the Louisiana Bayou Country, LSU Press)
Bayou-Diversity (19 February 2015) CYPRESS MULCH The legacy of Louisiana’s official state tree should not end in your flower bed. Mulching to control weeds and conserve water is a great idea; using mulch made from cypress trees is not. Most mature cypress forests in this state were cut for lumber decades ago. Almost all of the remaining stands are relatively young—too young to be used for timber and too young to reproduce naturally. When clearcutting of these young stands occurs to produce cypress mulch, any chance of future reproduction is eliminated, and unlike pines, cypress is rarely replanted behind a harvesting operation. The bottom line is that the current rate of cypress harvest to fuel the demand for mulch is not sustainable.
Florida was first to recognize this issue and many counties there restrict the use of cypress mulch. In a Louisiana study, cypress and water tupelo were determined to be the primary species in coastal swamp forests, a critical component of our imperiled wetlands. Significantly, the study found a current lack of regeneration in our remaining cypress forests.
Recent research has shown that the popular demand for cypress mulch is at least partly driven by myths. Consumers often buy cypress under the assumption that it is more durable and long-lasting. This is not the case since today’s mulch is made from young trees yet to develop rot-resistant heartwood. Work by the Florida Coop Extension Service found other problems: “When dry, cypress mulch repels water, making it difficult to wet, particularly if it is on a mound or slope.” Moreover, once it is wet “cypress mulch appears to have a high water-holding capacity that may reduce the amount of water reaching the plant root zone.” Even its attractive color soon fades away.
Cheaper and effective alternative mulches are available. A University of Florida study found that wood chips, pine bark and pine straw rated just as high as cypress. If you are concerned about the loss of Louisiana’s coastal wetlands, do your part and keep our state tree in the swamps, not in your flower bed. (Adapted from Bayou-Diversity: Nature & People in the Louisiana Bayou Country, LSU Press)
Bayou-Diversity (9 February 2015) DARTERS The most popular kinds of fish in this area are bass, crappie, bream, and catfish. They are well known because they are fun to catch and good to eat. However, in terms of biological diversity this group falls at the bottom rung of the aquatic ladder. In Louisiana there are only two species of black bass, two species of crappie, six species of catfish, and nine species of bream-like sunfish. Another group, almost completely unknown even to avid fishermen, swims our rivers and creeks with dramatic diversity of form, color and species. Collectively they are called darters.
Darters are the second largest family of North American fishes; only minnows have more species. They are found only in North America and only in fresh water. Some are widespread and others are restricted to single streams, leaving them vulnerable to extinction. Twenty species of darters have been found in Louisiana. Rarely longer than three inches, most inhabit clean streams with sand or gravel bottoms. Bedecked in vivid greens, blues, reds, and oranges, their spectacular colors never fail to amaze first time viewers. That such gaudy creatures could exist in our midst almost unknown is always surprising. Even their names reflect the diversity: rainbow darter, harlequin darter, cypress darter, bluntnose darter, goldstripe darter, speckled darter, redfin darter, and banded darter.
Animals such as darters often elicit the disturbing question: “So what good are these critters anyway?” You are not likely to hear about the first invitational Caney Lake darter tournament anytime soon, and don’t bother looking in the yellow pages for restaurants like Darter King or Darter Cabin if you’re wanting a mess of fried fish. Consider the thoughts of Aldo Leopold who articulated for the first time the idea that all parts of an ecosystem play important roles, even if we don’t recognize those rolls yet, and that no organism should be removed from an ecosystem. “The first rule of tinkering,” he wrote, “is to keep all the parts.” In Louisiana darters are a diverse group of parts. (Adapted from Bayou-Diversity: Nature & People in the Louisiana Bayou Country, LSU Press) (Photo of Rainbow Darter from NANFA)
Bayou-Diversity (30 January 2015) SPANISH MOSS Spanish moss is not. What I mean is that Spanish moss is not Spanish and is not a moss. It does not grow in Spain but rather in the southeastern United States down into South America. It is not a true moss like sphagnum but rather a flowering plant in the bromeliad family very closely kin to pineapples. Often associated with our images of southern swamps, Spanish moss grows on trees in long, draping, thread-like, gray veils where it absorbs moisture and nutrients from the air. The plants are not parasitic and don’t harm their host trees.
Many types of wildlife use Spanish moss in their life cycles. Squirrels and birds use it for nest materials. Parula warblers build their nests almost exclusively in draping clumps of the plant in some areas. Some species of bats roost in Spanish moss, and it is the sole habitat for one kind of jumping spider.
Humans have used Spanish moss for centuries. Early European colonists recorded Native Americans wearing clothing made from the plant. Louisiana Cajuns made a concoction of mud and Spanish moss known as bousillage for mortar and house insulation. Later an entire commercial industry developed around the harvest and processing of the plant into manufactured products. It was used for packing materials, mulch, and in saddle blankets. Thousands of tons were ginned and used to stuff mattresses until as late as 1975 when synthetic fibers replaced the natural filaments. Recently, researchers have studied components of Spanish moss as a possible drug to control blood pressure.
Because Spanish moss receives all of its nutrients from the air, it is very sensitive to wind-born pollutants such as pesticides and heavy metals from exhaust fumes. Early explorers in Louisiana often remarked about the dismal, dreary atmosphere associated with moss-laden swamps. We now know that the presence of healthy Spanish moss is an indicator of good air quality, and is thus a welcomed part of our bayou scenery. (Adapted from Bayou-Diversity: Nature and People in the Louisiana Bayou Country)
Bayou-Diversity (21 January 2015) One wild animal in the bayou state is singularly unique among our native fauna. It is kin to Tasmanian devils, koala bears and kangaroos. A persistent myth involving their reproductive habits is that they mate through the nose. This animal has opposable toes just like your thumbs and almost certainly has prowled about in your backyard. It has more teeth than any Louisiana land mammal and is even known to fake its own death when threatened. Correctly labeled the Virginia opossum, we all know them simply as possums.
Possums are marsupials, a group of animals in which the females have a pouch where the young are suckled and raised. They are found across the eastern half of the United States and have been introduced on the west coast. In the South they are ubiquitous in all terrestrial habitats. About the size of a short-legged house cat, possums have long gray hair that is used in the fur industry. A long, bare prehensile tail, a sharp-pointed nose, and naked ears combine to make this critter unmistakable. Captain John Smith of the Virginia colony wrote in 1608: “An Opassom hath a head like a Swine, and a taile like a Rat, and is the bignesse of a Cat. Under her belly shee hath a bagge, wherein she lodgeth, carrieth, and suckleth her young.”
The reproductive habits of possums are unique but not as creative as the old wives’ tale. Pregnancy lasts only 13 days, and when born the embryonic young weighing 1/200th of an ounce migrate to the pouch where they remain for about two months. After about a hundred days they leave their mother to seek their own fortunes.
Possums are omnivores and scavengers. They’ll eat about anything – dead or alive. Insects, fruits, berries, birds and their eggs, carrion, even their road-killed cousins are fair game. Except for the occasional raid on a chicken coop, possums rarely impact human activities. Indeed, they serve a critical function. Along with vultures they belong to nature’s local union of sanitary engineers, i.e. disposers f natural garbage. As such, they are important citizens wherever they live. (adapted from “Bayou-Diversity, LSU Press)
Bayou-Diversity (15 January 2015)1835 BALLOON ACCIDENT As with other cultures around the world, the first human inhabitants of what is now Louisiana undoubtedly marveled at the mysterious ability of birds to fly and perhaps even yearned to soar over the bayous and swamps free from the bonds of gravity. They could not imagine a night sky in which the blinking of aircraft lights or satellites was always present somewhere in the heavens as is the case today. Humans of course have mastered flight through a series of technological advances but not without peril even when Louisiana was a fledgling state. The following newspaper account reveals an 1835 Icarus-like episode involving a hot air balloon.
“Mr. Elliott, the aeronaut, has attempted to make an ascension in New Orleans, but the wind proved to be too strong. After seating himself in his balloon, and cutting loose, he was swept violently across the arena, knocking down several persons in his passage. The balloon next encountered a chimney top, which was overthrown by the concussion, and Mr. Elliott’s thigh was broken. Part of the bricks of the chimney falling into the car, prevented the balloon from rising higher, and it was afterwards dragged over housetops and walls, and dashed against windows, till the aeronaut’s hands, face and head were shockingly cut and mangled. At length, the cords of the balloon became entangled on the masts of two vessels in the river, and fortunately for Mr. Elliott, his farther flight was checked. In his passage over the buildings in the city, some of the cords by which the car was attached to the balloons, were sundered, and the aeronaut afterwards smiled with his head nearly downwards. If he recovers from his wounds and bruises, he will owe his life mainly to the great presence of mind that he maintained amid all the perils through which he passed.”
I expect that when the dust of this affair settled Mr. Elliott had an even greater appreciation of birds.
Bayou-Diversity (9 January 2015) SASSAFRAS In the midst of the Civil War Kate Stone, a fierce advocate of the southern cause, wrote from a plantation near Tallulah, “The plums and sassafras are in full bloom and the whole yard is fragrant. We all drank sassafras tea for awhile but soon got tired of it, pretty and pink as it is.” At the same time the infamous Yankee General Benjamin Butler was enjoying the delights of genuine New Orleans gumbos during his occupation of that city. His meals were surely spiced with dried, powdered sassafras leaves known as filé.
Sassafras is usually a shrub or small tree but can grow to eighty feet tall and three feet in diameter in optimum conditions. It often forms dense, shrubby thickets. The deciduous leaves are unusual in that three different shapes may grow on the same plant. Sassafras is widely distributed throughout the eastern and southern United States.
As a medicinal plant, sassafras is reported to be one of the first exported to Europe from the American colonies. Tea brewed from the roots was used to treat fever, pneumonia, bronchitis, catarrhs, measles and mumps. In recent years safrole, an oil found in the plant, has been reported to be carcinogenic in lab animals.
The wood of sassafras is very durable yet somewhat brittle. It was used for ox yokes, cooperage, light boats, poles, posts, and crossties. Bedsteads and roost poles in chicken houses were once made of sassafras to deter insect pests. A yellow to orange dye was made from the roots. Although an additive is manmade today, the odor of root beer drinks once derived from sassafras roots.
Like a host of other plants wild and cultivated, sassafras was used to brew an alcoholic drink during the Civil War. If you are interested, here’s a period recipe: “Take eight bottles of [sassafras] water, one quart of molasses, one pint of yeast, one tablespoonful of ginger, one and a half tablespoonful of cream of tartar, these ingredients being well stirred and mixed in an open vessel; after standing twenty-four hours the beer may be bottled, and used immediately.”
Adapted from Flora and Fauna of the Civil War, LSU Press
Bayou-Diversity (14 December 2014)SEWING MACHINES & SWEETGUM One of the most under-appreciated native trees in Louisiana grows in every parish, is important to wildlife, and has a fascinating local history. Distinctive star-shaped leaves identify sweetgum, which grows to 150 feet tall on rich alluvial soils. During the autumn it is one of our most colorful trees as leaves on the same tree may be purple, burgundy, orange and yellow. Sweetgum is important to several species of migrating spring warblers, each of which uses different parts of the tree to forage for insects. Liquidambar, the genus of the sweetgum tree, translates as “liquid amber” and refers to the waxy sap that was often chewed like chewing gum. During the Civil War, the Confederate surgeon general directed all of his medical officers to make available indigenous astringents including sweetgum for the treatment of bowel complaints among sick soldiers. Soldiers of both sides sought the plant for curative purposes. Sweetgum bark mixed with that of maple and copperas produced a purple dye, and the fruits were once used in a unique type of lighting in the South. Sweetgum balls were placed in shallow dishes filled with melted lard, and when lit the fruits produced a soft glowing light. The lustrous heartwood of large, virgin trees was known as red gum in the lumber industry. The vast Tensas Swamp in Madison and Tensas Parishes was once exploited for its giant red gums by two major corporations. One area was known as the Singer Tract where most of the wood in all Singer sewing machine cabinets originated. The other was called the Fisher Tract and yielded lumber for Chevrolet car bodies. The last stands of the virgin trees were cut by the 1940s, but there are plenty of their offspring left to appreciate. (adapted from my Flora & Fauna of the Civil War, LSU Press)
Bayou-Diversity (8 December 2014) MISTLETOE Well, the druids thought it peculiar also. As you are traveling around the next few days, scan the tops of the leafless hardwood trees and look for the dark green clumps of mistletoe. Now contemplate just how they came about growing in the loftiest boughs of our tallest oaks.
There are more than 20 species of mistletoe in North America and even others in Europe. The most common type in Louisiana has fragile green stems and small opposite leaves. Clumps of white berries form in late autumn. Eastern mistletoes grow on hardwood trees while most of those found in the western mountains and the Pacific region grow on evergreen conifers such as pine and spruce. Mistletoe is parasitic on its host tree, deriving most of its water and nutrients from the branches to which it is attached. Although a heavy growth of mistletoe may contribute to the decline of a tree with other ailments, it doesn’t usually kill its host.
To the druids, mistletoe appeared to spring from thin air. Equally strange, it seemed to defy nature by living its entire life high in the branches of trees, never descending to earth, a plant’s natural habitat. For these reasons they declared mistletoe and the oak trees on which it grew sacred. Six days after the new moon, white-robed priests gathered mistletoe with a golden sickle and following prayers and the sacrifice of two white bulls brewed a potion with special health-giving properties. Or so they say.
How does mistletoe become established in treetops? Birds of course are the culprits and after eating and digesting the berries scatter the seeds on the next convenient perch. In our area the berries are especially relished, and thus dispersed, by bluebirds, robins and cedar waxwings.
Mistletoe does not, as some believed, descend in a flash of lightning from the sky to alight on the sacred oak. My advice concerning the legends of mistletoe is to heed only that one which encourages holiday kisses.
Bayou-Diversity (17 November 2014) RIVER OTTERS What does a small meandering bayou in north Louisiana and a main branch of the Mississippi River that empties into the Gulf of Mexico have in common? It seems that both were named by French explorers for a semi-aquatic mammal that was abundant in each of the areas. Bayou de l’Outre in Union Parish and Pass a Loutre in Plaquemines Parish were named for river otters.
River otters, members of the weasel family along with mink and skunks, were once found throughout North America wherever wetlands existed. Built for a life in the water, they have streamlined cylindrical bodies covered with waterproof fur, short legs, and long tapering tails. Their ears and nostrils can close when submerged. Large males can be three and a half feet long and weigh 30 pounds. Up to five otter pups per litter are born in shoreline dens that are often usurped beaver cavities. An otter’s diet consists mainly of fish, which they are remarkably adept at catching. Depending on availability they also consume crawfish, crabs, mussels, snails, rats, and snakes. In Louisiana otters have no natural predators when they are in the water except humans and alligators. When on land they can become prey for bobcats, coyotes, and dogs.
In their aquatic environments otters are very susceptible to pollution. As top predators, the impacts of contaminants in fish are concentrated and multiplied in otters that eat them. Pollutants such as oil remove the protective water-proofing of otter fur. The direct loss of essential wetland habitat has contributed to otter declines nationwide, and in some areas trapping for their valuable pelts has been a contributing factor.
During the 20th century otter populations in Louisiana plummeted except for those in the coastal region and the Atchafalaya Basin. Otters were extirpated from many inland areas including Bayou de l’Outre, which suffered salt water contamination associated with the natural gas industry. In other parts of the country, especially the Midwest, some states lost all of their otters. Ironically, otters are now thriving in many of these same areas as a result of restocking programs that obtained otters from coastal Louisiana. With improved water quality and restrictive trapping regulations, Louisiana otters are once again common throughout the Bayou State, and some have even settled in as Yankees farther north. (Image is of Corney Creek otter with 2 pups.)
Bayou-Diversity (9 November 2014) ARBOREAL HAIL The white oaks of Union Parish released their offspring on November 9th of this year. Actually they began several days earlier and will continue for a week or so. On this day from my front porch my watch could not mark 10 consecutive seconds free of acorn-fall within earshot. It was the largest acorn crop in 10 years for this naturally cyclic species. As they fell at speeds up to 100 miles per hour they riddle the leaves below them like arboreal hail and buried their butts in mother earth. Some blasted the metal roof of my house, accelerated on the 7/12 pitch, and launched off the edge of the front porch at a very unbotanical angle. Once on the ground their troubles just began. Acorn borers, fungi and other pathogens, birds, and mammals attacked this nutritional cornucopia with relish. Few survived.
Unlike their spring germinating red oak cousins, white oaks germinate in the autumn. A myth involving squirrels is entwined with this adaptation. Squirrels are commonly believed to assist in the planting of acorns as they bury them for winter food caches. However, gray squirrels are known to cut out the embryo of white oak acorns before they bury them. This keeps the acorn from germinating, which would result in a loss of food energy for the squirrel. Remarkably, squirrels do not excise the embryos of spring germinating red oak acorns.
I counted 25 acorns in a measured square foot in my front yard. Eight of them were infested with acorn borers or were otherwise bad – better than normal. I also counted 44 white oak trees within 200 feet of my front porch. Each had an average crown of 1,300 square feet. I computed 1,430,000 acorns on the ground under the 44 trees. The 25 acorns that I collected weighed three ounces. All of the acorns in my yard thus weighed 10,725 pounds and probably a third of the crop was still on the trees.
In spite of this tremendous reproductive effort by nature, the probability of even one of these acorns growing into a mature tree is almost zero. The old trees in my yard produce deep shade, and oak seedlings are shade intolerant. This means that unless I cut down enough trees to allow sunlight to reach the forest floor, the seedlings will never get taller than a few inches. In natural conditions that rarely exist today, oak forests reproduce sporadically in tree-fall gaps. When an old, large tree falls its offspring grows up in the sunlit gap. The aesthetics of a giant fallen tree in the front yard is of no mind to Mother Nature. (adapted from Bayou-Diversity, LSU Press)
Bayou-Diversity (29 October 2014)“Doodlebug, doodlebug, your house is on fire! Come out! Come out! Wherever you are!” As a child this rhyme was my introduction to entomology, the study of insects. My mother, a south Mississippi country girl who migrated to Louisiana, instructed me to recite the passage while poking a straw into a doodlebug hole. Of course to enhance the chances of catching this animal, you should always spit on the end of the straw first. For a five year old, the educational and entertainment value of this exercise is unsurpassed.
Doodlebugs are also known as ant lions. They are members of a primitive order of insects unrelated to ants. More than 2,000 species are found worldwide. Some types of ant lions have a larvae stage that digs small conical pits about the size of a quarter in sandy areas. Here the fingernail-sized, predaceous larvae armed with barbed jaws lie buried in wait for ants to pass by and slide down the slippery slopes of the pit. From an ant’s perspective this critter is indeed a lion. After a period of time the larvae ant lions begin the mystery of metamorphosis and change into a completely different form that resembles a dragonfly. These long-winged, feeble-flying adults are mostly nocturnal and thus rarely observed. Pit-digging ant lions are called “doodlebugs” because of their meandering trails in the sand that resemble the “doodles” of a daydreaming artist.
Ant lion folklore is present in cultures around the world. Rhymes and charms associated with the insect can be found in Africa, Australia, China and the Caribbean. Mark Twain wrote in The Adventures of Tom Sawyer: “Doodle-bug, doodle-bug, tell me what I want to know!” One of the Apollo 16 astronauts, while walking the surface of the moon, compared lunar features to ant lion craters and was recorded chanting, “Doodle-bug, doodle-bug, are you at home?” My guess is that he learned the verse early in life from his mother—who may have been from south Mississippi.
Bayou-Diversity (22 October 2014) TWIG GIRDLER – A single beetle less than three-fourths of an inch long recently caused my computer to crash. My first thought was that all my valuable data were now in some black hole in another galaxy with family photos, essays, and email archives spinning around with a bunch of imprisoned light particles. Simultaneous with the computer failure, all of the smoke detectors in the house began their piercing out-of-sync chirp-whines, not unlike an imagined cat squirrel on meth. And oh yeah, the electrical transformer on the pole just outside the door exploded like a cannon shot then too. One oblivious beetle hell-bent on procreation started a chain of events that altered my day and that of several others.
The bug was a twig girdler. Her business in life is to produce more twig girdlers. She does this by chewing a v-shaped groove around the stem of a small twig, usually pecan, hickory or oak in our area. She then lays an egg under the bark of the twig beyond the cut. The girdled twig, deprived of nutrients, quickly dies and soon falls to the ground. Clumps of brown leaves with stems that resemble a partially sharpened pencil can often be seen under yard trees after a spate of autumn breezes. The egg hatches into a larval beetle that bores deeper into the twig to feed and settles in for the winter. Pupation occurs in the cavity and a new adult beetle emerges in late summer to early fall to mate and renew the cycle. Life for the twig girdler goes on.
But insect life is hazardous and the cycle was interrupted for at least one beetle in my yard when her egg-laden twig fell across the electrical lines causing a dead short that blew the transformer fuse. I was more fortunate than the beetle as summoned utility workers resolved the problem in a couple of hours. My computer data resurfaced with the fresh flow of electrons, like a revitalizing current returning to the stagnant bayou down the hill.
Bayou-Diversity (15 October 2014) OSAGE ORANGE On May 7, 1857 a slave named Hastings was put to work trimming a dense, thorny hedge around a field on a plantation just southwest of Bastrop. Six years later on June 7, 1863, Major General J.G. Walker of the Confederate Army attacked a Union force at Milliken’s Bend in Madison Parish in hopes of relieving pressure on the besieged fortress of Vicksburg. His attack was thwarted, in part, because of a dense hedge around part of the village. Yankees massed behind the hedge and fired through the openings. General Walker wrote “Upon reaching the hedges it was utterly impracticable to pass them except through the few openings left for convenience by the planter.”
The plant that contributed to the slave’s misery and the Rebels’ frustration was osage orange, also known as bois d’arc or horse apple. Originally, it likely grew only along the Red River Valley in Texas and Oklahoma. The name of the tree comes from the Osage tribe, which lived in that area and valued the strong, elastic wood to make bows. The spread of the species into other areas began as the Osage traded it among Plains and southeastern Indian groups. White settlers quickly learned to use the tree to create impenetrable living fences before the invention of barbed wire. Saplings were pruned to promote a bushy growth. “Horse high, bull strong and hog tight” were the criteria for a good osage orange hedge. This meant that it was tall enough that a horse could not jump it, strong enough that a bull could not push through it, and woven so tightly that not even a hog could root through.
Osage orange is in the mulberry family. It grows to 40 feet tall and is known for it unusual fruits, which are hard, warty, yellow-green, and about the size of a soft ball. Squirrels relish them, but oddly few other animals eat the fleshy fruits. Some scientists speculate that now-extinct large mammals such as ground sloths, mammoths, and mastodons once ate the fruits and dispersed the seeds. The wood is still used for fence posts, and at one time the bark was used for tanning leather and making a yellow dye.
The famous Dunbar and Hunter expedition up the Ouachita River in 1804 made the first known scientific documentation of osage orange in North America. Two hundred years ago they recorded it as growing upstream of what is now Monroe, and in their report to Thomas Jefferson said that these plants had been transplanted from somewhere else. Today it is still possible to find descendents of the early hedges scattered as individuals along the high banks of the river and bayous such as Desiard and Bartholomew. They harbor a bit of local history under that gray, ridged bark. (adapted from Bayou-Diversity: Nature & People in the Louisiana Bayou Country, LSU Press)
Bayou-Diversity (6 October 2014)POISON IVY! At the same time Thomas Jefferson sent Lewis and Clark to explore the Missouri River he commissioned William Dunbar to conduct a similar expedition on the Ouachita River. Dunbar’s mandate was similar to Meriwether Lewis’ in that he was required to record and describe native plants and wildlife observed during the journey. One passage in his journal reads, “We have a Vine called the poison vine, from a property it possesses of affecting some persons passing near it, by causing an inflammation of the face resembling an Erysipelas. Other persons may handle this vine with impunity. It is believed perhaps without reason, that some are affected by only looking at it.”
Fortunately you can’t get poison ivy just by looking at it although for some folks it doesn’t seem to take much more than that. It is a vine in the cashew family that grows to fifty feet or more and has characteristic three-lobed leaves. The plants contain poisonous oil called urushiol. When it comes in contact with skin the chemicals cause an immune reaction producing redness, itching and blistering. It is important to remember that you don’t have to touch the plant to have a reaction. The oil can be carried on the fur of pets, on garden tools, or on any object that has come in contact with the plant. It can even be transmitted in the smoke of burning poison ivy vines. It cannot, however, be spread by scratching the blisters in spite of what your mother said.
Fruits of these poisonous plants are consumed by many kinds of wildlife without any apparent ill effects. Deer relish poison ivy leaves and concentrate the toxin in their chambered stomachs creating an occupational hazard for careless biologists who sometimes must examine them during herd health checks. This I can vouch for personally. (adapted from Bayou-Diversity, LSU Press)
Bayou-Diversity (29 September 2014) RED WOLVES – Gone & Mostly Forgotten – Not uncommonly, the yips and yaps of coyotes can be heard across much of Louisiana. They evoke images of lingering wildness in our heavily altered landscape. Ironically, when our area was truly wild, coyotes were nowhere to be found in this region. Their voices were instead replaced by the haunting howls of red wolves. As the dominant canid of virgin forests of the Southeast, red wolves restricted the range of coyotes to western prairies for the most part.
Weighing 45 to 80 pounds, red wolves are larger than coyotes but smaller than gray wolves. Their name derives from the reddish color of their fur behind the ears and on the neck and legs. In the early 1930s researchers from the Chicago Academy of Sciences discovered that many in northeast Louisiana were melanistic, being totally black. Socially, red wolves live in packs of five to eight family members. Breeding pairs bond for life and have one litter per year. Their diet consists of small mammals such as rabbits, raccoons, and rodents, and occasionally deer.
The fate of red wolves was sadly similar to that of many native predators that tend to compete with human interests. Aggressive government predator control programs coupled with widespread habitat destruction decimated red wolf packs throughout their range. Then as their social structure deteriorated, hybridization with coyotes almost drove the species to extinction. By the mid-1960s pureblood red wolves were restricted to the gulf coast region of extreme southwest Louisiana and southeast Texas. They were designated an endangered species in 1967 and efforts began to restore the species. Fourteen of the remaining wolves were captured to begin a captive breeding program. The species was declared extinct in the wild in 1980. Offspring from the captive animals were released on a North Carolina refuge in 1987 and later in the Great Smoky Mountain National Park. The release failed in the Smokies but about 100 red wolves roam their historical range in eastern North Carolina today. Two hundred others remain in captive breeding facilities. Human attitudes will determine if the mournful howls of red wolves are ever heard again in Louisiana. If the controversy involving the gray wolves of the West is an indicator, coyotes will remain king of the canids in Louisiana for a long time to come.
Bayou-Diversity (9 September 2014) EYESHINE – In my family there are stories about lean times during the Depression when rabbits were a welcomed source of protein in the household larder. Most were shot at night with the aid of a carbide lantern. Rabbits were detected by their eyeshine in the dim glow of the light. Boys, new to the venture, were reminded that because rabbits’ eyes are on the side of their head, only one eye could be seen at a time. And if, when walking through the lonely swamp at night, a person were to detect a creature with two eyes shining, he should remember that such physiology is a trait of many predators that can see much better at night than a mere boy.
The cause of much hope and apprehension during these undertakings was a cluster of highly refractive crystals behind the retinas of the shining eyes. Known as tapetum (ta-PEA-tum) lucidum, these organs make the pupils of some animals appear to glow when struck by an outside light source. Animals with the brightest eyeshine usually have more rods and fewer cones in their retinas resulting in excellent night vision but also color-blindness. Not all animals have a tapetum or eyeshine. Humans don’t. Those animals that do have eyeshine tend to be mostly nocturnal and include many mammals but also spiders, some fish, frogs, and alligators. The color of eyeshine also varies by species. Horses have blue eyeshine, fish have white eyeshine, and that of the possum and many rodents is red. The eyeshine of cats and canids, which include cougars and wolves is yellow, a fact not lost on my hungry kinfolks when they spotted two glowing orbs in the heart of D’Arbonne Swamp.
Bayou-Diversity (9 August 2014) – ANTLERS – Even the dog days of summer can’t dissuade many Louisiana hunters from dreaming of frosty autumn mornings and the chance to bag a trophy buck. Much of the appeal involves the boney appendages that grow from the skull of male white-tailed deer. Bigger is better. If you want to make a biologist cringe, refer to these prized objects of desire as “horns.” They are not, but rather are correctly termed antlers. True horns consist of a core of dermal bone covered by a horny epidermal sheath. The sheath is the actual horn, and they are not usually shed. Cows have horns. Antlers are branched structures of bone characteristic of the deer family and are shed annually.
Antler growth of deer in Louisiana usually begins in April or May. The antlers are covered by skin and hair, sometimes called velvet, until they mature in the early fall. Mature antlers are about 60 percent mineral and 40 percent organic matter. Velvet is shed and antlers are polished in most bucks by mid-October. Antlers are shed or cast as early as January, but most are retained through mid-March.
The entire antler growth-development-casting cycle is directly tied to seasonal fluctuations in day-length, or photoperiodicity. Growth begins as day-lengths increase, and physiological changes that lead to antler shedding occur as day-lengths decrease. When deer are subjected to artificial light sources, their cycles can be shifted out of phase. As would be expected, deer in the tropics where day-length is constant exhibit antler development cycles at various times of the year. These cycles do not occur in unison.
It has long been recognized that antler development in white-tailed deer is a function of at least two independent factors: age and level of nutrition. Genetics is also important. Overall, older bucks have larger antlers up to a point. Research shows that dietary energy, protein, and minerals are critical. In most situations these variables are tied directly to the soil type in a given area. Fertile soils produce deer foods high in energy and protein. Infertile soils don’t. This means that the greatest potential for large-antlered deer in the bayou state lies in the rich alluvial soils of the Mississippi and Red River floodplains. However, trophies can and do occur in other areas in response to special conditions. An entire industry has developed around the nutritional aspect of antler development. Dietary supplements in the form of mineral blocks, high protein feed, and purported miracle clovers sell like hot cakes to hunters in search of the perfect wall-hanger. Many are of dubious value.
The science of deer antler growth and development is quite advanced. The knowledge vacuum lies in the arena of their lure and intrigue to humans.
Bayou-Diversity (31 July 2014)Fences et al.
About a hundred yards north of my house in the dense woods, the remnants of an old fence can be seen running north-south over a sandy-clay hill on the edge of the D’Arbonne Swamp. The forest looks the same on both sides of the rusty wire now, but it once enclosed a ten-acre field where my father chopped cotton as a teenager. When boll weevils, armyworms, and worn out soil forced the Union Parish hill-country cotton farmers to seek work in paper mills, chemical plants, and on pipelines, the field reverted to forest through natural plant succession. The timber on it has been cut at least twice since the Great Depression, the last time about 1988. I moved next door to the property a couple of years later and remember finding grog-tempered potshards in the loader sets. It occurred to me at the time that this evidence, along with a few chert artifacts, was the only indication that hundreds of generations of humans had lived here long before white settlers of European descent began off-loading up the river at Alabama Landing. For better and worse, the lingering and continuing changes to the local natural world can be attributed to the offspring of these new people. We regal in the better but are blissfully ignorant of the worse. The biological sterility of commercial pine monoculture has swept clean the rich biodiversity of historical upland hardwood forests. Even the once abundant free flowing springs that nurtured Native Americans and settlers alike have disappeared into plunging aquifers, collateral damage of unquenchable local industries.
The cotton field is gone now, and I often wonder what this area will look like in a hundred (or even a half dozen) generations. Nature is remarkably resilient. A forest can restore itself with biodiversity if demand for single-species pulpwood is assuaged, and aquifers can be replenished, but only when the fence that restrains thoughtful consumerism rusts into the shadow of time.
Bayou-Diversity (18 July 2014) Dog Day – In the dog days of summer after the fresh-split firewood reeking with the sweet acerbity of tannin is stacked in a neat pile close by the house, we become crepuscular. Like certain amphibians striving to maintain a proper balance of body fluid and temperature, we venture forth into the out-of-doors only in the twilight hours of dawn and dusk, leaving behind our artificial cocoons of refrigerated and dehumidified air. Even the cicadas are now out of sorts, droning about their business at mid-day when a pregnant cloud passes in front of the sun. In the first slow light of morning we sip strong coffee on the back porch facing east and the hardwood forest where the birdsong rises. The cardinal calls first; then the liquid flute of the wood thrush sounds from the understory. Thoreau wrote of the wood thrush song, “Whenever a man hears it he is young, and Nature is in her spring; wherever he hears it, it is a new world and a free country, and the gates of Heaven are not shut against him.” This cousin of the bluebird is now tracking the declining hours of daylight with a mysterious sundial embedded deep within his brain. On a night in mid-August he will flush at a silent alarm and begin a nocturnal journey that will end for the season in the coastal lowlands of Central America. As for the cardinal, he suffers not from innate wanderlust and with his kind will still be around to serve as Christmas ornaments in the vanishing dogwood trees of Union Parish. With coffee cups almost empty, we are surprised this morning by the running-late possum that peeks over the edge of the porch on his routine check of the bird feeders. We all conclude that in spite of the bidding thrush and Thoreau’s doggerel to the contrary, it is time to seek shelter again until the evening respite.
Bayou-Diversity (12 July 2014) Tomatoes & Lawyers For many southern palates ambrosia can be defined as a home-grown, vine-ripened, freshly sliced tomato. In their long journey to domestication tomatoes have made a number of interesting stops around the world, none less so than the U.S. Supreme Court. This particular side trip began in 1883 when congress imposed a 10 percent tax on all imported vegetables. One disgruntled and botanically astute importer challenged the law on the grounds that tomatoes were technically fruits and not vegetables. He was correct according to accepted biological definitions. The justices though unanimously leaned in the direction of the common man’s vernacular, rejected the botanical truth, and the misconception was perpetuated along with the taxes.
The wild kinfolks of tomatoes grow in Central America and along the western coast of South America. From Peru an ancestor of the tomato may have migrated to Mexico where it was first domesticated. Aztec recipes using peppers, salt, and tomatoes may have been the original salsa. These first tomatoes were small, cherry-like, and grew on a creeping vine.
Very soon after Cortez’s infamous triumphs in Mexico in 1521 tomatoes turned up in Europe. Cultivation quickly became widespread after overcoming a few superstitious speed bumps. Often associated with other poisonous and hallucinogenic members in its nightshade family, tomatoes got a bad rap early on. In German folklore they were tied to werewolves, and the Latin scientific name for tomatoes translates to “edible wolf peach.” Tomatoes sailed back to North America with the colonists, but maintaining a shady reputation they were largely considered as ornamentals. Suspicions of the tomatoes’ safety were not put to rest until the 19th century. It is a good thing. Who would we be without shrimp creole and BLTs?
Bayou-Diversity (2 July 2014)“Their toes are five in number on the anterior feet, and four on the posterior; their sharp and conical teeth are arranged in a single series in each jaw; their tongue is flat, fleshy, and closely attached almost to its very edge; and their bodies are clothed with large, thick, square scales, the upper of which are surmounted by a strong keel, those of the tail forming superiorly a dentated crest, double at its origin.”
So goes the description of an alligator kept in the Tower of London menagerie in 1829. Pass these facts on to your friends and family as you eagerly await the next episode of Swamp People.
Alligators are reptiles in the taxonomic class called Reptilia. Members of this group have common characteristics. All are ectothermic or cold-blooded and have backbones. Most have four limbs (except snakes, which have four-limbed ancestors), reproduce by laying eggs with shells (except, again, for some snakes), and have bodies covered in scales or scutes. Within Class Reptilia, alligators are placed in the subdivision known as Order Crocodilia and are referred to as crocodilians. Members of this group have similar anatomical traits and include 2 species of alligators, 13 kinds of crocodiles, 6 species of caimans, and the gharial. Alligators differ from crocodiles by having a broader snout and an upper jaw that overlaps teeth in the lower jaw. The gharial has a long, slender snout. Alligators most closely resemble caimans that live in Central and South America. The American alligators that Troy Landry dramatically pursues grow larger than their closest relative, the Chinese alligator, which rarely exceeds 7 feet in length. Still, there might be potential in an oriental version of Swamp People for any of you entrepreneurs out there with Beijing connections. (Adapted from American Alligator: Ancient Predator in the Modern World; photo by Burg Ransom)
Bayou-Diversity (24 June 2014) Please don’t “rescue” her! Every year in late spring and early summer Louisiana wildlife officials begin receiving reports of abandoned deer fawns from concerned citizens. Often young fawns are observed alone with their mothers nowhere in sight, which leads to the almost always erroneous conclusion that the fawn has been abandoned. Exceptions occur such as when the doe is known to have been struck by a vehicle, but they are uncommon. Problems occur when well-intentioned people attempt to rescue the apparent orphans. Several studies, some using radio telemetry to track deer movements, have shown that it is very common and natural for does to leave their fawns for extended periods during the day to feed. In these situations the does always return and have no problem locating their young. Even if the fawns move while they are gone, their mothers have no trouble tracking them down using their keen sense of smell. Capturing fawns is almost always counterproductive from a natural standpoint. They are rarely orphaned, and it is very difficult to successfully reintroduce pen-raised fawns to the wild. It is also against the law.
An interesting note on a related subject involves the differences in the breeding cycle of deer in our area. Although fawns can be born anytime from late spring until early fall, those in the delta lands east of the Ouachita River and particularly those in parishes along the Mississippi River tend to be born about a month later than those in the hills west of the Ouachita. The gestation period is the same, about 205 days, and the reason for this variation is not clearly understood. Perhaps deer in the low-lying areas evolved a breeding regime better adapted to the historic annual backwater flooding there. If this is the case, man-made levees and drainage districts have mostly eliminated the cause of divergence in the breeding cycles and future adaptation may bring the hill deer and swamp deer back into sync. (Adapted from Bayou-Diversity, LSU Press)
Bayou-Diversity (14 May 2014) BAYOU EARTHQUAKE?! Dr. R.F. McGuire was a prominent Ouachita Parish physician and planter in the first half of the 19th century. He was also a diarist and kept a journal from 1818 until 1852. An educated man, he dutifully recorded the weather and other natural phenomena in north Louisiana along with business and politics of the era. His entry of April 7, 1842, hints intriguingly at links to a human tragedy that occurred 1,500 miles away on that same day.
At about 5pm local time, several thousand feet below the island of Hispaniola in the Caribbean, where two giant plates of the earth’s crust meet under grinding pressures, one of the plates suddenly lurched twelve feet. The result was a devastating earthquake with an estimated magnitude of 8.1 and a dreadful tsunami. The earthquake was felt over a wide area, including Jamaica, Cuba, and Puerto Rico, but the northern coast of Haiti and what is now the Dominican Republic received the brunt of the natural disaster. Following the earthquake at Port-de-Paix, Haiti, the sea withdrew 200 feet from shore and returned to drown the city in 15 feet of water. Five thousand people perished there as the estimated human mortality throughout the region approached 10,000. History remembers the event as he 1842 Cap-Haitien earthquake.
Communications of the day precluded any chance of Dr. McGuire learning about the disaster for weeks. However, in referring to that date he writes, “it is reported the waters in the [Bayous] Darbonne & [Choudrant?] were instantly [raised] about a foot with a gurgling noise & receded again without any storm.” He goes on to speculate that the bizarre event may be tied to the presence of a comet. We now know this to be a false nexus, but other than the distant earthquake what could explain the strange happenings on Bayous D’Arbonne and Choudrant?
Bayou-Diversity (1 May 2014) NATIONAL CHAMPION BALDCYPRESS* – Nothing characterizes a southern swamp more than a giant moss-draped cypress tree standing knee-deep in a backwater slough. Technically known as baldcypress, these survivors of ancient life forms once found across North America and Europe are now greatly restricted in range. In the United States they are native to river bottoms and swamps in the Deep South and along the eastern seaboard north to Delaware. In Louisiana, although the last large virgin stands are gone, cypresses can still be found in every parish.
Cypress trees once grew to 17 feet in diameter and 140 feet in height. They were the largest trees in the South and lived to be 400 to 600 years old. A few were estimated to be more than 1,000 years old. Even though cypresses commonly grow in wetlands, their seeds cannot germinate under water and young seedlings die very quickly if they are overtopped by floodwaters. This means that the trees growing in Monroe’s Bayou DeSiard, Old River in Natchitoches, and Lake Pontchartrain near New Orleans began life on dry or muddy ground that was not flooded during the growing season for at least a couple of years. Older trees can adapt to intermittent flooding regimes and usually develop fluted trunks, but permanent, deep flooding will eventually kill most mature trees. A steady decline of cypresses in the areas mentioned above is quite evident.
Most cypress stands today are second growth, but there still remain a few giants among us. They exist because they are hollow and thus not merchantable or because they grow in an area so remote as to make harvest unfeasible. They tower one hundred feet above the earth and laid down their first annular rings during the classical period of the Mayan culture. They germinated and grew into seedlings as Charlemagne was crowned Holy Roman emperor. They were sound and mature when the sun gleamed from the swords of Hernando DeSoto’s men as they marched across northeastern Louisiana in a fruitless search for gold. It is possible that their limbs were once laden with the weight of a thousand passenger pigeons and that their bark was probed by ivory-billed woodpeckers. Cougars and bears may have sought refuge in their hollows. It is likely too that a few of these will still be greeting each spring with a fresh feathering of needle-like leaves in centuries to come. (adapted from Bayou-Diversity book, LSU Press) (*note person standing in hollow of tree)
Bayou-Diversity (21 April 2014) Many people along the rivers and bayous of Louisiana got hell scared out of them on the early morning of November 13, 1833. Clergymen reported widespread, sudden confessions followed by conversion of sinners as definitive signs of the Apocalypse engulfed their world. Indeed, every living human east of the Rocky Mountains in North America was exposed to phenomena with heavenly origins never since repeated in history. It is noted in the chronicles of scientists of the day, Native Americans, and Deep South slaves. It was “the night the stars fell.”
On this date a record breaking meteor storm of such intensity as to be nearly unimaginable occurred. We now know that the event was part of the annual Leonid meteor shower that occurs each autumn when Earth passes through the debris field of particles left by comet Tempel-Tuttle. The meteor shower got its name because the bright streaks of light seem to originate in the constellation Leo. At the peak of the 1833 incident, reliable sources reported over 200,000 meteors per hour. Night was turned to day.
A Louisiana man wrote, “There came on a complete shower of stars. They fell for two hours from the clouds, as thick and fast as a July shower of rain, and continued until the sun destroyed their light . . . the earth was so illuminated at intervals that a pin could be seen at any moderate distance.” Lakota Indians recorded the event on their buffalo skin calendars. Afterwards, slaves in different areas of the South reckoned their age from “the year the stars fell.” One slave woman remembered, “Somebody in the quarters started yellin’ in the middle of the night to come out and to look up at the sky. We went outside and there they was a fallin’ everywhere! Big stars coming down real close to the groun’ and just before they hit the ground they would burn up! We was all scared. Some o’ the folks was screamin’ and some was prayin’. We all made so much noise, the white folks came out to see what was happenin’. They looked up and then they got scared, too. But then the white folks started callin’ all the slaves together, and for no reason, they started tellin’ some of the slaves who their mothers and fathers was, and who they’d been sold to and where. The old folks was so glad to hear where their people went. They made sure we all knew what happened . . . you see, they thought it was the Judgment Day.” There are no records to determine if the religious convictions were lasting, but history suggests that most were as ephemeral as the meteors.
Bayou-Diversity (31 March 2014) A Storied Rocker – Not long ago a cousin passed along to me a chair that once belonged to my great-great grandmother. She is said to have brought the chair with her when she came to Union Parish from the Atchafalaya Swamp or south Mississippi. No one is sure which. She died in 1925 at the age of 77. The chair is laden with hints and mysteries of lives past. Just a bit larger than a child’s chair now, it was originally a rocking chair but was converted to a simple ladder-back when the rockers wore out or broke. Someone with hardscrabble talent built the hand-made chair out of native white oak. Flaking brown paint reveals bare wood with long horizontal rays, a characteristic that distinguishes white oak from red. Though simple in style the chair is not without a touch of refined craftsmanship in the three thin, curved slats that undoubtedly supported the weary backs of subsistence farmers. The seat was originally made from the stretched hide of either a deer or cow. About the time of the Great Depression the seat wore out, timing that may not be coincidental. By then the chair had been passed down to my cousin’s mother, and her husband promptly replaced the seat with a hand-sawn cypress board. Saw marks on the board indicate that the lumber was cut with a circular saw blade about three feet in diameter. It was not run through a planer, thus forgoing an unnecessary expense in a time when cash was scarce. Someone, probably a mischievous boy cousin with a jackknife, whittled small notches in the top slat when no one was looking. The most intriguing parts of the chair are the front stretchers. These rungs have been worn to nearly half their original diameter by propped feet, and likely by the same person because most wear is on the same part of the same stretcher – a person who favored his or her left foot. Knowing how hard it was to survive on a small farm in the red clay hills, I suspect the mark to be an artifact of worry. On the other hand, great-great grandmother was known to revel in the music of her small, round accordion. I prefer to think she rocked the rockers off her chair and then wore the rung through while marking time to a Cajun reel. (Adapted from Bayou-Diversity–Nature & People in the Louisiana BayouCountry, LSU Press)
Bayou-Diversity (24 March 2014) The most famous mascot of the Civil War was a bald eagle known as Old Abe of the 8th Wisconsin Regiment. The eagle was carried on a mast instead of a regimental flag and allegedly witnessed numerous battles and skirmishes. A soldier at Vicksburg in 1863 described a staged confrontation between Old Abe and a canebrake rattlesnake: “the carrier gave Old Abe a little toss and he flew up on the limb where he sat turning his head first to one side and then the other, looking down at the angry rattler below. Then his keeper said, ‘Take him Abe.’ And before I could see how it was done he gave a scream, dropped from the limb, and with one claw seized the rattler by the head, and with the other on his body literally tore his head off, then hopped on the limb again. I would have lost my money sure. The rattler had no chance to bite.” Old Abe survived the war to appear at fund-raising events for veterans and orphans. (Adapted from Flora & Fauna of the Civil War by K. Ouchley, LSU Press)
Bayou-Diversity (17 March 2014) “Louisiana Orchids” – Is there a southern twayblade or fragrant ladies’ tresses in your life? Perhaps not, but they and their kin are about in numbers and diversity that might surprise you. Orchids are often thought of as exotic, gaudy, almost unnatural flowers found only in jungles and corsages. Actually they make up the largest family of flowering plants in the world with more than 30,000 species. Several are very common in Louisiana.
Orchids are unique in many ways. Most species found in the tropics are epiphytic, which means they grow above ground attached to tree branches and bark. However, with one exception those that live in Louisiana are terrestrial, growing in the ground. Orchids are considered the most specialized of flowering plants and will only grow in habitats with very specific conditions. They produce the smallest seeds of any flowering plant, and one plant may release more than a million of the dust-like particles. Once the seeds germinate, growth will not occur without the presence of mycorrhizae, a special type of soil fungus. The fungi actually penetrate the cell of the seeds and provide nutrients for the growing plant. Development of the mycorrhizae relationship is slow, and some species need ten years before the orchid appears above ground to flower.
Native orchids in Louisiana include the crane-fly orchid, common in the hill parishes. For most of the year it lives as a single purple-bottomed leaf on dry upland pine/hardwood sites. The water-spider orchid that grows more than two feet tall lives at the other end of the hydrologic spectrum. It is found in masses of floating aquatic vegetation in swamps and bayous throughout the state. Because each native species of orchid has very different and exacting needs, they should not be removed from the wild. Precise amounts of sunlight, nutrients, moisture, and the presence of critical mycorrhizae are extremely difficult to mimic in a cultivated setting. Native orchids grow where they grow for a reason, and unlike many cultivated plants, the reasons have nothing to do with the desires of humans.
Adapted from Bayou-Diversity: Nature and People in the Louisiana Bayou Country (LSU Press).
Bayou-Diversity (6 March 2014) [Photo of Abita from Iron Branch] One hundred fifty years ago the American Civil war was raging across the South with halcyon days somewhere in a hazy future. It affected every one of us today, and the following is just a part of my story.
In late November 1864 just before the battle at Franklin, Tennessee a hungry lieutenant of the 1st Florida Volunteers crawled around on his hands and knees in a dark, recently captured blockhouse searching for something to eat. He felt a promising object and took it out into the light for a better look. In recalling the event he said, “It was a big flat ear but I had no appetite.” Henry W. Reddick could not have imagined that his Civil War memoir recounting this incident and many other trials would shape a great great grandson’s life 150 years later.
As a precocious reader I have long been enthralled with the written word. When I was about nine years old I began to hear family rumors that one of my distant grandfathers had actually written a book, an amazing thing to contemplate. This instigated my persistent inquiries until an aunt presented me with a mimeographed copy of Seventy-Seven Years in Dixie. She duplicated it from the family’s only remaining original edition, a tattered softback with a red paper cover. I still have it. An enchanted document, it induces new questions every time I read it. Without a doubt, the book with its provenance fertilized my nascent interest in history.
So, after retiring from a career as a biologist during which most of my writing was “governmentese,” I came back to Grandpa Reddick’s work along with thousands of other Civil War diaries, journals and letters. I gleaned them for natural history anecdotes and compiled a manuscript that became Flora and Fauna of the Civil War. Broader research even resulted in a novel: Iron Branch – A Civil War Tale of a Woman In-Between.
I have a young grandson. Should one of his future grandchildren discover my books someday, I hope that he or she is moved, even if in a small way, to burrow deeper into the joys of the written word and to consider the possible inspiration of their own creations.
Bayou-Diversity (25 February 2014)OUACHITA/AMAZONOn a recent trip to the upper Amazon Basin I was able to see the Ouachita River as it appeared 200 years ago. The time reference could also be labeled as 100 BC – BC being before Corps of Engineers and their snagging, dredging and lock-building efforts to domesticate a feral river in the good name of economic development. Riding down the Madre de Dios River in a thirty-foot canoe, like a giant, hollow pencil sharpened at both ends, one only has to squint a bit to blur the unfamiliar riparian vegetation of a rain forest into a generic green mass that resembles the bottomland hardwoods along the Ouachita.
The Amazon tributary, unencumbered by levees and dams, is homeless and wanders the jungle floodplain in the manner of what geologist’s call a braided stream. Today’s main channel may be an oxbow lake next week as the river seeks a path of least resistance to carry its combined burden of glacial till, suspended clays, and organic nutrients ever seaward. Point bars, cut banks, and meander loops come and go with seasonal frequency. On the Ouachita such instability is viewed as counter-productive, dangerous, and a challenge to modern riverine engineering.
Human activities along the Madre de Dios today and the Ouachita two centuries ago are similar. In the jungle, scattered small villages of indigenous peoples cling to the high outside banks, their palm-thatched huts not unlike those palmetto-roofed houses of Choctaw along the Ouachita. Small gardens and bounty of the forest sustained them both. Evidence of small-scale illegal logging by poor natives in the form of riverside piles of rough-sawn timbers mar the image of a pristine rain forest. Such activities can be compared to similar practices by Native Americans farther north on lands dubiously claimed by the likes of the Baron de Bastrop and Marquis de Maison Rouge.
Biodiversity along the Ouachita never approached that of the Madre de Dios even in the best of times, a function of the Amazon’s isolation from the glacial driven extinctions of North America. The faunal assemblage there is intact, and while wildlife is still abundant in our region, several important historical players are gone forever. Carolina parakeets don’t visit clay licks along the Ouachita like their counterpart parrots and macaws in the Amazon. Great flocks of passenger pigeons no longer break the limbs of oaks in their acorn feeding frenzies, and Ouachita River fords felt the last sharp hooves of bison more than two centuries ago.
Along many rivers in the Amazon Basin, all of the parts are still present, connected, and humming along according to natural rhythms and processes. If one believes in the repetition of history, this short essay, in a flip-flopped sort of way, may yet be relevant there in 200 years. (Adapted from Bayou-Diversity: Nature & People in the Louisiana Bayou Country, LSU Press)
Bayou-Diversity (18 February 2014) DÉJÀ VU – In the spring of 1996 a feathered bolt of lightning launched from the top of a skyscraper in downtown Minneapolis. During her maiden flight the young peregrine falcon tested long, pointed wings that make her species the fastest fliers on the planet. She soon learned to knock the city pigeons from the sky by sheer force of impact and returned to roost at her nesting site on top of the office building.
Peregrines are found around the world and have been worshiped by kings and sheiks for centuries as the most sought after weapon in the ancient sport of falconry. Admiring owners harness the prowess of semi-tame falcons to hunt game birds. They have also served humanity in ways other than recreation. At the beginning of World War II, the Royal Air Force trained peregrines to intercept Nazi carrier pigeons in the time-honored tradition of Caesar, King Richard I, and Bismarck.
By the 1960’s, peregrine populations in North America had plummeted as the pesticide DDT worked its way up through the food web into the falcons. The U.S. Fish and Wildlife Service formally listed the bird as an endangered species. DDT was eventually banned, peregrine restoration programs began, and the species slowly recovered.
The Minnesota falcon ranged farther as the summer progressed and continued to hone her hunting techniques on wild birds up to and including her size. Larger than her brother, she eventually left him and the nest site for good. Later in the autumn she began to respond to an urge with origins in her Miocene ancestors – the mysterious phenomenon we call migration. She followed the crests of north-south ridges, riding thermals to ease her journey. Traveling flocks of shorebirds and waterfowl provided ample food.
By January 18, 1997, she had flown nearly 800 miles and crossed the invisible boundary between the Natural State and the Sportsman’s Paradise following the sinuous Ouachita River with its attendant bayous. Barely five miles into Louisiana, her pilgrimage ended when a person who likely claimed to be a hunter shot her.
We know these details of her life because biologists banded her in the nest on the skyscraper, and someone brought her mortally wounded to my office. We don’t know the details of the perpetrator’s life. In other times when human survival depended literally on intelligence, this person may not have lived beyond adolescence. He does not think. (Adapted from Bayou-Diversity: Nature & People in the Louisiana Bayou Country – LSU Press)
Bayou-Diversity (7 February 2014) Beginning in the early 1970’s strange activities started to occur during early spring in graveyards throughout Louisiana. Reports indicated bizarre behavior by small groups of people in cemeteries both rural and urban. To observers these people were obviously not there to pay respect to deceased loved ones or friends, as is usually the case with visitors. They were dressed in rugged field clothes; some were shabby in appearance. Most of them were young, but there was always an older balding man in their presence, obviously the leader of their rituals. The scenario was the same at each event. The group would arrive at the graveyard in a hodgepodge of vehicles and immediately gather around the leader for a blessing of sorts. With plastic bags in tow they would then disperse across the cemetery to begin the really weird goings-on. As soon as each individual reached a mysteriously chosen spot he or she immediately fell to his or her knees and began crawling slowly about on all fours with butts often higher than noses. It seemed to be a quest for some tiny, ghoulish treasure, and when the object was found the discoverer emitted a screech of pleasure, which straight away caused a mini-stampede as everyone rushed over to worship the object. This went on for a while with varying degrees of enthusiasm or despondency depending on how many totems were found until the entire group loaded up and drove away as inexplicably as they had arrived. The activity continued for several successive springs – or so it all seemed.
The truth of this matter when anyone bothered to ask was about as strange as the speculation. The leader of the group was a prominent professor of botany at Northeast Louisiana University and the others were his students of plant taxonomy. They were searching for botanical treasures in the form of any of five species of a tiny plant called adder’s tongue fern in the genus Ophioglossum. Very un-fern-like, the plants consist of a single, simple, ground-hugging leaf less than an inch long. One has to be purposefully and intently looking to find it. It is most common and most easily found in areas that have been mowed closely for many years, thus the cemetery searches. In their diligent hunts the professor and his students contributed to science by expanding the known range of these little-known plants – facts usually lost on curious passers-by. (Adapted from Bayou-Diversity-Nature & People in the Louisiana Bayou Country by Kelby Ouchley, LSU Press)
Bayou-Diversity (28 January 2014) SWAMP SNOW – Swamp snows don’t come often to Louisiana. Only during a rare conjugal visit of otherwise estranged weather gods, warm wet air from the gulf overrides a lingering cold front to produce moisture that morphs into hexagonal crystals. If the snow seeds are sufficiently fertile and the humidity high flakes the size of dimes, nickels, or even the wings of bride moths float into the winter world of baldcypress trees, Spanish moss, and squealer ducks. Almost always the temperature is marginal, the apparition fleeting as a persistent sun sweeps clean the spell in a cruel shower of snowmelt. It is best to visit a snowed swamp soon while the sky is still leaden, to eschew the garish glare in favor of shadowless hues, subtle and natural.
Tree bark and slough water provide contrast for the whiteness. Willow oaks have coarse, dark-roast coffee bark; the skin of cypress is furrowed russet. All things botanical, apart from the vertical, wear ermine mantles, especially the logs on their journeys back to earth. Members of the wetland arboretum appear to doze and transpire slowly under their insulating blankets. The water is translucent black, and cold as liquid water can be. It is swamp blood sustained now with snowflakes as well as raindrops. As molecules flowing across the gills of widow skimmer dragonfly larvae they are not discernible. Pumped through xylem eighty feet up to the highest twigs of an overcup oak in order to nurture an acorn, it matters not what form they entered the swamp. Here contrast is absorbed.
Louisiana swamp snows bear other gifts in the shape of anomalies. Orb spiders in their webs snare snowflakes instead of mosquitoes. In the frigid water wood ducks preen, cavort, and squeal in anthropomorphic displays of delight. Emerald mosses go about their subtropical business of procreation, and fish crows fly over without ever uttering a word. They know that all traces of the day’s conjuration will vanish on the morrow. (Adapted from Bayou-Diversity, LSU Press)
Bayou-Diversity (9 January 2014)Alligators did not welcome the recent spate of cold weather. The least known aspect of alligator life history involves their behavior during the winter, especially in inland swamp habitat. In general, they retreat to dens during cold weather, but they do not hibernate. Instead, they brumate, a condition when the core temperature and other physiological processes decrease, but not to the extent that occurs in true hibernation. Other kinds of reptiles, including some snakes and turtles, also brumate. Alligators must surface to breathe when brumating and apparently move in and out of this state as the weather changes. They bask on warm winter days, but an alligator out of water on a very cold day is usually the sign of a sick alligator. Their ability to slow down bodily functions allows them to survive cold weather only up to a point. Infrequently, extended periods of unusually cold weather, when water remains frozen for several consecutive days, occur in northern Louisiana and southern Arkansas. In the last 30 years I have observed alligator mortality within two weeks of almost all of these events. Usually the dead alligators were larger adults that floated to the surface. Larger individuals may have been more sensitive to cold or just more likely to be seen when they died. During a severe cold spell in the winter of 1983-84, thousands of alligators died in Louisiana, Texas, and Mississippi. The temperature dropped to 13 degrees in coastal marshes with an ice cover four inches thick for several days. Surveys showed that alligators of all sizes succumbed, and deaths continued for several weeks after the weather event. The extent of alligators’ ability to regulate their body temperature limits where they can survive. As the climate warms in some areas, we might expect their range to expand, but there will always be setbacks as likely occurred here recently. (Adapted from American Alligator – Ancient Predator in the Modern World by Kelby Ouchley, Univ. Press of Florida; photo by Burg Ransom)
Bayou-Diversity(1 January 2014)In Tolkienesque fashion, crows and owls live an
epic drama of perpetual conflict. Their behavior conjures up anthropomorphic notions of hatred and revenge as crows mob owls in daylight and owls decapitate crows on stealth wings in the dark of night. Such conduct, though, is merely part of the business of survival for these species. For hobbits and humans – not so much. . . .
Bayou-Diversity (21 December 2013) Don’t expect blue jays to come to your bird feeder on Fridays. They spend that day with the devil telling him of the bad things we did all week – or so I’ve been told by a “reputable” source. A recent government survey indicated that over 60 million Americans feed wild birds, and that they spend a lot of money doing so. For economic and biological reasons it’s best to be knowledgeable about the critters you’re dealing with and what they eat. For example, if your goal is to have robins, bluebirds or purple martins at your feeder, you are going to be disappointed. These birds eat insects and barring hummingbirds, woodpeckers and the occasional oriole, birds that routinely come to feeders are seedeaters. And not just any seeds will do. The big box stores are full of so-called birdseeds that are for the most part worthless. Certain species of birds prefer certain kinds of seeds and its best to match them up. In our area birds that frequently come to seed feeders include cardinals, goldfinches, house finches, chickadees, titmice, white-throated sparrows, juncos, doves, and blue jays. Studies find that black oil sunflower seed is the most popular seed with most seed-eating species. However, if you want to attract titmice, white-throated sparrows, or blue jays you’ll probably have better luck with peanut kernels. Mourning doves prefer white proso millet as unfortunately do English sparrows and cowbirds. Goldfinches like sunflower seeds and niger thistle. In this area, canary seed, German millet, red millet, wheat, safflower, rape, hulled oats, milo, and cracked corn are almost worthless and a waste of money. Feeding wild birds is educational, a great hobby and helps birds on a local basis, but don’t look for the blue jays on Friday. (Adapted from Bayou-Diversity, LSU Press)
Bayou-Diversity (12 December 2013)One of the most profound mysteries of nature involves salmon and their epic journeys from the ocean back to the freshwater rivers and streams of their birth in order to reproduce. In Louisiana there exists a species of fish that performs a feat no less amazing. In fact this species does the salmon act backwards. I am referring to the American eel.
Eels are widespread in North America and common in the rivers and larger streams of our area. Though their bodies are elongated and snake-like, they are actually scaleless fish with fins and gills. They should not be confused with what many local people call “lamper eels”, which are not eels at all but rather a species of harmless salamander that frequents swampy areas and ditches. The true eels are sometimes called “fish eels” in this region. They occasionally reach 5 feet in length and are mostly nocturnal, feeding on a variety of fish, insects, snails and crawfish.
There is much yet to be learned about the life cycle of this species, but what is known is remarkable. Behaving exactly opposite of salmon, eels live out their adult lives in freshwater and return to the ocean to spawn. In fact, all eels return to a specific area known as the Sargasso Sea just north of the Bahamas. Here their life begins and ends. Eggs hatch into 2 inch larvae and drift in Gulf Stream currents for up to a year, most eventually arriving on the eastern coastline of North America. Some are drawn into the Gulf of Mexico. As they drift they change into a more eel-life form and usually in the autumn when they are still less than 4 inches long they begin to enter freshwater rivers and streams. The young eels are determined at this stage and have been known to climb the wet walls of dams and wiggle up moist grass banks to get around obstacles. Many travel upstream several hundred miles where they may live as adults from 5 to 20 years. At some point the adults begin drastic physical changes that prepare them for migration back to the sea. They stop feeding, eyes and fins enlarge, and their body color pattern transforms. The migration occurs during autumn nights as they retrace their natal routes down rivers and streams through locks and over dams and back into the ocean for a January spawning in the warm Caribbean waters. Here the females lay 10 to 20 million eggs each and life for the species is renewed even as the adults soon die on the spawning grounds. This profound mystery occurs right here in our midst and always below us as we cross the Louisiana bridges with our minds on the mundane issues of our own lives.
Bayou-Diversity (1 December 2013) GOOSE MYSTERY: The source of mysteries is not limited to the likes of Tony Hillerman or P.D. James. Nature also serves up some perplexing whodunits from time to time. On the evening of January 25th, 1983 several people called the Lacassine National Wildlife Refuge in southwest Louisiana where I worked to report unusual snow goose mortality near Jennings. As the regional wildlife disease biologist I was responsible for looking into the matter. The affected site was a rural farming area about two miles wide and five miles long. Local residents reported first seeing dead geese on the morning of the 25th. Birds were found in yards, roads, and ditches as well as in open fields. I saw about 50 dead geese scattered at random lying belly up. They made indentations in the wet fields where they struck the ground, indicating that they became incapacitated while flying and fell from the sky. I estimated the total mortality to be 200 to 300.
I collected and necropsied several of the geese. No lesions characteristic of infectious diseases were found although all exhibited free blood in the heart and lung cavities. A definitive cause of death could not be established, but the pattern of mortality seemed to rule out diseases, parasites, or poisoning. No known waterfowl disease or parasite causes such a rapid death, and mortality from something like pesticide poisoning might be expected to emanate from a central focus where contact with the agent occurred. Such was not the case.
The National Weather Service station at Lake Charles and local residents reported heavy thunderstorms in the area the night before the first dead geese were seen. Although the carcasses showed no signs of lightning or hail strikes, I concluded that the mortality was weather related. Severe thunderstorms are known to spawn powerful updrafts capable of lifting aircraft thousands of feet. Coastal thunderheads often tower to seven miles above the earth. The barometric pressure and oxygen content of air at these heights are greatly reduced. It is feasible that a flock of geese caught in an updraft and carried rapidly to such heights will experience respiratory and circulatory problems similar to those found in the necropsied birds. This theory would also explain the distribution of carcasses as geese succumbed and fell out of the storm at slightly different times and places.
Geese have been observed flying at extreme altitudes in places such as the Himalayas. These heights were probably achieved over a period of hours thus allowing time for physiological adjustment. The Louisiana geese were likely carried aloft in a matter of only a few minutes, which precluded their acclimation and resulted in mortality. So, nature mystery solved. Well….at least in theory.
(Adapted from Bayou-Diversity: Nature & People in the Louisiana Bayou Country – LSU Press)
Bayou-Diversity (19 November 2013) Among the greatest ecological calamities of our times in north Louisiana has been the conversion of diverse upland forests in the hill country to pine plantation monoculture. One hardwood species that was historically common though never abundant is black walnut. Other than a few surviving trees planted in old farmsteads, walnuts have almost vanished from this region. They once grew to over one hundred feet tall and were cherished for their important wood and edible nuts. Still common in parts of the Midwest, walnut trees are so valuable, with individual trees worth thousands of dollars, that timber poaching is often a problem.
Walnut lumber is used to make high quality furniture, flooring, and coffins. It was once the most sought-after wood for beautiful gunstocks, but has been increasingly replaced by plastic for this use. Ironically, the petroleum that is processed into plastic is often produced using drilling fluids that have ground walnut hulls as a major component. The ground shells are also used in water filters, cosmetics, and abrasives.
Walnut fruits are nuts encased in a hard shell that is embedded in a softer green husk. The nutmeats are difficult to extract but have a unique, natural flavor much richer than that of English walnuts commonly found in grocery stores. Black walnuts are used in gourmet baked goods, ice cream, salads, and pasta dishes. The husks contain chemicals that were once used to make a dark brown dye. When I was a boy, local trappers would boil their steel traps in a tub filled with walnut husks to camouflage the traps and remove human scent.
The ecological role that black walnut played in Louisiana forests in unclear. Certainly, wildlife ate the nuts. Walnut leaves contain chemicals called “polyphenols” that repel insects. Roots produce another chemical that inhibits nearby competing plant growth. The vegetation under a black walnut tree looks different from that found under nearby trees. Whatever the function once provided by the scattered black walnuts in our natural forests, it has been supplanted by genetically modified pine trees that grow in nice straight rows.
Bayou-Diversity (6 November 2013) What does a chickadee at your bird feeder, a tyrannosaur that lived in northeastern China 175 million years ago, and a tragic 16th century play have in common? That the chickadee is covered with feathers is not surprising, but finding the richly detailed plumes on the fossil of a Jurassic dinosaur seems a bit incongruent. Feathers are made of a special group of proteins called keratins. During development, the proteins bond into twisted sheets that result in microscopic structures similar to but stronger than those found in the hair, claws, and horns of mammals. The job of feathers on modern birds is to provide insulation from cold temperatures in both air and water. Proto-feathers found on dinosaurs served the same function. Feathers allow birds the remarkable concept of sustained, controlled flight, a phenomenon shared only with bats and some insects. Feathers also play important behavioral roles in the lives of birds during courtship and defense of territory.
The significance of feathers for humans is cross-cultural and spans the globe. They have adorned the bodies of British queens, Aztec kings, and New York socialites. They are used in the religious ceremonies of Native Americans and in snakebite medicine by East Asians. Feathers are fashioned into fishing lures for anglers and regimental headdresses for generals. They have been stuffed into mattresses during times of peace and fletched on arrows for war. Feather quill pens yielded the U.S. Constitution, the novels of Jane Austen, and the complete works of Shakespeare. Paleontologists consider the discovery of feathered dinosaurs further evidence of kinship between those reptiles and the ancestors of birds, thus the connection between an oriental tyrannosaur, a Carolina chickadee, and incidentally Romeo and Juliet.
Bayou-Diversity (30 October 2013) In humans and other animals a covering of skin serves various functions including protecting the body within. In trees and other woody plants bark can be considered analogous to skin. Like skin, bark is comprised of several layers, some living and some non-living. The outermost layer is called cork and does not consist of living cells. It is usually impermeable to water and gases. Moving inward, specialized layers of living cells perform critical functions including the transport of nutrients. The nutrients are manufactured via photosynthesis in the leaves or needles and flow through sieve-like tubes throughout the rest of the plant.
Humans have been using bark products for thousands of years. The inner bark of some plants is edible. The spice we call cinnamon is finely ground bark of the cinnamon plant. Latex and resins are bark products used in chemicals. Tannin from oak bark was used to tan animal skins for centuries. Lifesaving medicines such as quinine and aspirin were made from bark. As a construction material bark is used as shingles and flooring. Native Americans made birch bark canoes, and today we grind it up to use as landscape mulch.
This discussion of bark would be incomplete without mentioning how we thoughtlessly abuse it even while cherishing the plant it protects. The invention of the gasoline-powered string trimmer has resulted in the unintentional and untimely deaths of countless landscape trees and shrubs. If a string trimmer has been used in your yard, I challenge you to look closely at the base of your woody plants. There is a very good chance they have been partially or completely girdled. Once the bark of a plant has been seriously damaged, the plant will never thrive to reach its potential and will often die. Besides destroying the nutrient transporting cells, bark wounds are prime entryways for pathogenic bacteria, viruses, and insects.
To view another bark-related travesty in our region, visit a public campground and consider the nearby trees that we love for their shade and aesthetic values. Most will likely be hacked, scored, burned, or carved with initials. Beech trees in particular are condemned if they are so unfortunate as to germinate in a public area. Considering the many benefits that we have reaped from bark over the centuries, what does this unnecessary destruction say about us?
Bayou-Diversity (24 October 2013) I claim to be the only person in Rocky Branch, Louisiana with a whale in an aquarium. He shares my living room tank with two moody zebra cichlids. Other than being unfailing stimulators of conversation among visiting friends, they have little in common.
The cichlids of course are fish and originated in Lake Atitlan in Guatemala, and I found the whale, a mammal, in the Bayou Dan Hills in Caldwell Parish. The main difference is that the fish are alive, and the whale breached and took his last breath about 40 million years ago. Less important details include the fish being four inches long and the whale nearly 70 feet in length. The fish are also intact in my aquarium, but unfortunately the whale consists of only a single tail vertebra that resembles a large, brown, petrified mushroom.
The bones of “Basilosaurus cetoides,” as paleontologists dub him, have been found in a band across Louisiana, Mississippi, and Alabama where Eocene marine deposits are exposed. This layer surfaces near the community of Copenhagen in Caldwell Parish. Heavy rains occasionally erode whale bones, great white shark teeth, and coral from steep hillsides that were once the bottom of a warm shallow sea. Whale vertebrae were so common in some areas that settlers used them as fireplace andirons and blocks to support cabins. In 1843, Dr. Richard Harlan first described this species from bones collected in Caldwell Parish at bluffs along the Ouachita River. Thinking that he had the remains of a giant ocean-going reptile, Harlan named the animal Basilosaurus, which means “king of the lizards.” Later, another scientist found a complete skeleton in Alabama and recognized the creature as a primitive whale. An impressive specimen hangs from the rafters of the Smithsonian Institute today.
In his prime my whale had a stream-lined body that resembled a sea-serpent more than a modern whale. His head was five feet long with teeth-laden jaws that allowed him to capture and gulp down fish by the tub full. The cichlids don’t seem to worry much about this though, and his surviving tail bone is a constant reminder that indeed, “the times, they are a changing.”
*Adapted from Bayou-Diversity: Nature & People in the Louisiana Bayou Country (LSU Press)
Bayou-Diversity (9 October 2013) At the turn of the 20th century, Louisiana’s vast natural resources in the form of virgin forests and teeming wildlife were besieged by commercial interests and others lacking environmental mores. In this state of diminishing wilderness Ben Lilly emerged from the swamps of northeastern Louisiana to become a folk hero. His reputation as the best hunter of his day evolved as a result of his obsessive compulsion to kill bears and cougars. President Theodore Roosevelt hired him as his chief guide during his noted Louisiana bear hunt. Ironically, Lilly’s successful efforts in Louisiana and later out West contributed to the loss of a life style that he cherished.
Benjamin Vernon Lilly was born in Wilcox County, Alabama, in 1856. As a young man he settled on his uncle’s Morehouse Parish farm near Mer Rouge. He hated farming, and dabbled in the cattle and timber businesses. None of these occupations were satisfying. He discovered his passion in the local swamps of Bonne Idee and Boeuf after killing a bear with a knife. From that point forward his life centered on the pursuit of large predators. Accordingly, in 1901 he transferred his property to his wife and children and walked out of their lives.
Lilly soon learned that he could make a living as a hunter and became good at it. The U.S. Bureau of Biological Survey hired him to collect for the national museum. Over the years he sold them many skulls and skins. From Louisiana he shipped a cougar, five black bears, seven red wolves, and two rare ivory-billed woodpeckers. In 1906 Lilly decided to seek greener pastures and left Louisiana for the Big Thicket of east Texas. There he was successful in killing a number of bears and his reputation spread. He drifted into Mexico and spent many years in Arizona and New Mexico conducting predator control for ranchers and the gvernment.
Lilly’s legendary status was due in part to his peculiar looks and habits. President Roosevelt wrote of him:
“He has a wild, gentle face, with blue eyes and full beard; he is a religious fanatic and is as hardy as a bear or elk, literally caring nothing for fatigue and exposure which we couldn’t stand at all . . often he would be on the trail of his quarry for days at a time, lying down to sleep wherever night overtook him.”
Lilly would not raise a hand to work on Sunday. He never cursed, smoked, or drank alcohol or coffee. He was known to subsist for days in the wilderness with only a sack of corn meal. Ben preferred to sleep and eat outdoors even when amenities were available. Laden with bearskins and live cougar kittens, his brief and infrequent visits to towns only enhanced his enigmatic aura. Given the opportunity in a crowd, he was known to promote his own heroic folklore.
Lilly died in Grant County, New Mexico in 1936, about 80 years old. His epitaph in the Old Silver City Cemetery reads, “Ben Lilly – Lover of the Great Outdoors.” By modern standards, the inscription would contradict his lifestyle of the relentless pursuit of apex predators. He was, by any standard, cast of a different metal.
Monuments to Ben Lilly have been erected in Mer Rouge and in New Mexico’s Gila National Forest. Recently, the Ben Lilly Conservation Area was established in Morehouse Parish along Bayou Bartholomew. (adapted from: Ouchley, Kelby. “Ben Lilly.” KnowLA Encyclopedia of Louisiana. Ed. Dave Johnson. La. Endowment for the Humanities, 23 July 2013.)
Bayou-Diversity (13 September 2013) I try to avoid shameless, self-promotion on this site, but Hey – how many books does one write in a lifetime! I’m happy to announce that my new book on alligators from Univ. Press of Florida is now available on Amazon and elsewhere. It’s a concise, up-to-date account of this very interesting critter and is full of factoids (longest, heaviest, food habits, etc.). I hope you enjoy it and welcome your feedback.
Bayou-Diversity (19 August 2013) Is there a grown man in Louisiana who as a boy has not, in spite of dire warnings, chunked rocks at a wasp nest and paid the dear, dear price? I doubt it, myself included. Most types of social wasps aggressively defend their nest. Because the stinger is a modified egg-laying organ, only females can sting. Unlike some bees, which sacrifice their lives when they sting, wasps have a barbless stinger that can be used many times. During a sting, venom is injected into the skin of the victim, and nerve endings of pain receptors are promptly stimulated. Usually, a short burst of vigorous, aerobic exercise follows almost simultaneously. If the exercise results in a murdered wasp within a 15-foot radius of its nest, the situation quickly deteriorates. Dying wasps release a pheromone that attracts revenge-minded sisters. Retreat is always a better option. About two people out of a thousand are hypersensitive to wasp stings, and an encounter can be fatal if not treated promptly, usually with epinephrine. It’s important to remember that native wasps are a spoke in the wheel of our ecosystems. A few are pollinators, and most serve to keep in check various insect populations. Aldo Leopold, the father of modern wildlife conservation, once said, “The last word in ignorance is the man who says of any plant or animal, ‘What good is it?’”
-Adapted from Bayou-Diversity (LSU Press)
Bayou-Diversity (14 August 2013) Okay, here’s the Louisiana bayou trivia question of the day. Just what are those softball-sized, jelly-like globs that are often seen attached to bayou trees and boat docks, especially after water levels fall? Impress your friends with this answer: Bryozoan Colony. These gray, gelatinous masses are actually colonies of thousands of individual animals called zooids. Each zooid is a microscopic creature complete with a mouth, digestive tract, muscles, and nerves. The jelly-like material serves as a protective matrix for the colony. Individuals feed by filtering tiny algae from the water through tentacles. Since algae don’t usually grow well in muddy water, the presence of bryozoan colonies in a stream can be an indicator of good water quality, at least in terms of turbidity. Colonies grow in size by budding from the adult zooids. New colonies are established from free-swimming larvae produced by the zooids. There are many species of bryozoans, but most live in salt-water environments. Of the approximately 20 freshwater species found in North America, most live in warmer regions.
Studies have shown that humans are much more susceptible to develop an affinity for animals that have soft, furry coats and large eyes than for creatures without backbones. So where does that leave the blind, slimy, bayou dwelling invertebrates that make up the bryozoan colony in terms of popularity? Well, as long as we don’t pollute all of our waterways, it probably doesn’t matter. Bryozoans have been around for 450 million years according to the fossil record and will probably be here long after we’ve stopped asking trivia questions.
[adapted from the book Bayou-Diversity, LSU Press]
Bayou-Diversity (6 August 2013)In 1976 while most of the nation was celebrating America’s bicentennial, the Louisiana state legislature was up to more important things. They were debating the designation of an official state fossil. Apparently the issue became contentious when one senator nominated a colleague for the title. Calm returned to the chamber floor only when the second senator declined in deference to age rather than beauty. Subsequently, the distinguished body voted unanimously to name petrified palm wood as the official state fossil.
Fossils in Louisiana are relatively scarce, and petrified wood was a good choice. Petrified wood is formed when any of several types of minerals replace buried woody tissue. Silica is the most common replacement mineral. In the western United States much of the petrified wood developed after being buried by volcanic activity. In Louisiana the wood was buried in the silts and sands of meandering rivers and streams that occurred on the Gulf Coastal Plain around 30 million years ago. The shore of the Gulf of Mexico was further north then explaining why most petrified wood is found in the northern half of the state.
The Louisiana state fossil is specifically petrified palm wood. Of the many types of petrified palms, those found in Louisiana are most commonly in the genus Palmoxylon. It is a favorite of rock collectors because of high silica content, well-defined rod-like structures, and variety of colors. Jewelers like it because it polishes well and for its durability. They follow in the tradition of Native Americans who used worked petrified wood as tools for thousands of years.
While some might argue that Louisiana politicians are indeed petrified at least in their thought processes, their efforts to recognize an interesting fossil should be considered on the educational merits. (from Bayou-Diversity – LSU Press)
Bayou-Diversity (15 July 2013) 150 years ago, New Orleans was occupied by Union forces during the Civil War. Some of the northern men discovered unanticipated environmental hazards as related by Private Isaac Jackson, 83rd Ohio Volunteer Infantry, on August 16, 1864: “There was quite an accident happened to one of Co. F today. He was down to the river washing his shirt. . . . when a ‘Gar’ came up and caught hold of his hand. It nearly cut three of his fingers off. It nearly jerked his arm off, he said. The Alligator Gars are a savage looking fish. They have a very large mouth with a long bill running out in front. They look like they could take a man’s leg off at one snap. I will send you the scales of one I found on the river bank.”
The image is a rare photo of Union soldiers fishing. For more on this topic, see my “Flora and Fauna of the Civil War” (LSU Press).
Bayou-Diversity (8 July 2013) For many southern palates ambrosia can be defined as a home-grown, vine-ripened, freshly sliced tomato. In their long journey to domestication tomatoes have made a number of interesting stops around the world, none less so than the U.S. Supreme Court. This particular side trip began in 1883 when congress imposed a 10 percent tax on all imported vegetables. One disgruntled and botanically astute importer challenged the law on the grounds that tomatoes were technically fruits and not vegetables. He was correct according to accepted biological definitions. The justices though unanimously leaned in the direction of the common man’s vernacular, rejected the botanical truth, and the misconception was perpetuated along with the taxes.
The wild kinfolks of tomatoes grow in Central America and along the western coast of South America. From Peru an ancestor of the tomato may have migrated to Mexico where it was first domesticated. Aztec recipes using peppers, salt and tomatoes may have been the original salsa. These first tomatoes were small, cherry-like and grew on a creeping vine.
Very soon after Cortez’s infamous triumphs in Mexico in 1521 tomatoes turned up in Europe. Cultivation quickly became widespread after overcoming a few superstitious speed bumps. Often associated with other poisonous and hallucinogenic members in its nightshade family, tomatoes got a bad rap early on. In German folklore they were tied to werewolves, and the Latin scientific name for tomatoes translates to “edible wolf peach.” Tomatoes sailed back to North America with the colonists, but maintaining a shady reputation were largely considered as ornamentals. Suspicions of the tomatoes safety were not put to rest until the 19th century. It is a good thing. Who would we be without shrimp creole and BLTs?
Bayou-Diversity (5 June 2013) Hardwood giants reigned on the ridges of Lafourche Swamp until the rake of crosscut saws reduced their tight annular rings to a lifeless commodity. Large sweetgums such as this one were called “red gums” because of the carmine tint of the heartwood. The logs were quarter-sawn and veneered to become the cabinets of Singer sewing machines and the paneling of woody station wagons. . . so that we might experience progress.
Bayou-Diversity (25 May 2013) Screech owls are the smallest of four types of owls found in Louisiana. Their call is not a screech but a soft, mournful whinny that rises and falls down the scale. Renowned for superb night vision due to eyes with large retinas and a high concentration of light-gathering cells, owls have even more remarkable hearing. Large heads and ear openings with flat faces receive minute sounds not unlike a radar dish. These senses along with soft, serrated wing feathers for noiseless flight make owls unparalleled stealth predators of darkness. As adults, screech owls are about 10 inches long with ear tufts. They exhibit two color phases – gray and red, as shown by these babies in my nest box.
Bayou-Diversity (22 April 2013) Nothing characterizes a southern swamp more than a giant moss draped cypress tree standing knee-deep in a backwater slough. Technically known as baldcypress, these survivors of ancient life forms once found across North America and Europe are now greatly restricted in range. In the United States they are native to river bottoms and swamps in the Deep South and along the eastern seaboard north to Delaware. In Louisiana, although the last large virgin stands are gone, cypresses can still be found in every parish.
Cypress trees once grew to 17 feet in diameter and 140 feet in height. They were the largest trees in the South and lived to be 400 to 600 years old. A few were estimated to be more than 1,000 years old. Even though cypresses commonly grow in wetlands, their seeds cannot germinate under water and young seedlings die very quickly if they are overtopped by floodwaters during the growing season. Older trees can adapt to intermittent flooding regimes and usually develop fluted trunks, but permanent flooding will eventually kill the trees.
Historically, cypresses have been very important to humans in Louisiana. The wood is easy to work and attractive, the heartwood having a reddish hue. The most prized characteristic is the durability and resistance to decay that develops in the wood of trees several hundred years old. Native Americans were the first to recognize this attribute and routinely used cypress for dugout canoes. Early colonists were quick to discover the trait. By the late 1800’s the demand for cypress lumber for boats, furniture, pilings, trim, shingles, siding and coffins was great. It was during this period that the vast virgin stands were logged over. By 1925 the once thriving cypress industry was in a spiraling decline as the last of the raw products were exhausted.
Most cypress stands today are second growth, but there still remain a few giants among us. They exist because they are hollow and thus not merchantable or because they grow in an area so remote as to make harvest unfeasible. They tower one hundred feet above the earth and laid down their first annular rings during the classical period of the Mayan culture. They germinated and grew into seedlings as Charlemagne was crowned Holy Roman emperor. They were sound and mature when the sun gleamed from the swords of Hernando DeSoto’s men as they marched across the South in a fruitless search for gold. It is possible that their limbs were once laden with the weight of a thousand passenger pigeons and that their bark was probed by ivory-billed woodpeckers. Cougars and bears may have sought refuge in their hollows. If humans so choose, it is likely too that a few of these will still be greeting each spring with a fresh feathering of needle-like leaves in centuries to come.
Bayou-Diversity (5 April 2013) This from my field diary 40 years ago: “17 Feb. 1973 –
observed 2 golden eagles and 3 bald eagles on McClemore Plantation [now part of Tensas River NWR] 13 miles south of Tallulah, La. All eagles were mature. 1 golden and 1 bald eagle were feeding on deer carcass hung in fence. Golden and bald eagles flew together in mock aerial battles.” This incident remains a highlight of my birding career. Although bald eagles are much more common today, golden eagles are still a rare sight in Louisiana.
Bayou-Diversity (18 March 2013)As is the case with most predators, gar are usually considered nuisances because they compete with man for other species. For many years fisheries biologists sought ways to exterminate gar including elaborate
shocking devices, traps and nets. They have no doubt been reduced in numbers, especially the larger individuals. What is not clear is the role that gar play in a natural aquatic ecosystem as they sit at the top of the food web. It is likely significant. In addition to controlling populations of other fish, they are known to be intermediate hosts in the larval stages of some freshwater mussels. Mussels are the natural filtration system in our lakes and rivers. No gar > No mussels > No filtered water. We don’t even know what we don’t know about Mother Nature.
Bayou-Diversity (7 March 2013) An early-spring blooming native, goldenclub is an excellent aquatic plant for home water gardens. The plant grows from a rhizome, and the bright yellow flowers are clustered on an odd-shaped spadix. In the 1800s it was called “never wets” because of the water shedding quality of the waxy leaves and was used medicinally to treat burns. Within Louisiana, it is found most commonly in the Florida parishes east of the Mississippi River and in the southwestern marshes.
Bayou-Diversity (2 March 2013) Many people have the idea that orchids are only found in exotic tropical jungles or in the local flower shop. They are surprised to learn that wild orchids grow in Louisiana. In fact at least 40 species grow in various habitats across the state. Some are rare like white-fringed orchid, which has been found only in one parish, and others are very common. The southern twayblade in this photo is most abundant in the northern half of the state and in the Florida parishes. It is blooming now!
Bayou-Diversity (21 February 2013) Mayhaws are blooming!
For those of us who might be considered unrefined epicureans, May is the month of ritual pleasures involving a wild gourmet treat. It is the season to gather mayhaw fruits and make one of the finest jellies to grace a buttermilk biscuit.
Born of southern swamps, mayhaws are small trees technically considered hawthorns in the rose family. They grow in wetlands across the Southeast and are usually found in soils that have a sandy component. Accordingly they are rare in the heavy clay soils near the Mississippi River and common along the Ouachita/Black River system and its tributaries.
The white mayhaw flowers occur in February and March and often present the first splash of spring color to local woodlands. Flowers usually occur before and during the emergence of leaves. Marble-size reddish fruits resemble small apples and ripen in May and June. An old axiom claims, “If mayhaws flower in the water, they will fall in the water.” This refers to the backwater flooding common to most mayhaw habitat. Studies have shown that trees standing in water have a delayed bloom period.
Mayhaws are an important food source for many kinds of wildlife. Deer, raccoons, squirrels, opossums, and several species of birds relish the fruits. Native Americans undoubtedly consumed them for thousands of years, and the first Europeans quickly learned of their value. One pioneer Louisiana diary account reveals that mayhaw gathering could be quite an adventure. Miss Caroline Poole, a schoolteacher in the frontier village of Monroe, writes in her entry of May 7, 1836, “Hunt for May-haws. Rode sixteen miles on horseback. Saw rattlesnake. Crossed bayous where the water was above the saddle skirts, thirty yards wide. Saw black snakes in abundance. Camped in the woods. Coffee. Bacon cooked on a stick. Enjoyed the day but very much fatigued.” A note in The Gazette of Farmerville on May 2, 1894 reads, “Mayhaws are ripening and the teeth of the small boy will soon ware a wire edge, but he will cut the mayhaws all the same.”
Currently, during years of abundant crops, hundreds of thousands of pounds of mayhaws are gathered from Louisiana swamps by individual connoisseurs. A commercial market has also been developed, and it’s now possible to enjoy a fine local mayhaw wine with the exquisite jelly on that buttermilk biscuit. Amen.
Bayou-Diversity (11 February 2013) In all likelihood when the first humans migrated into what is now Louisiana, domesticated dogs were in the vanguard leading the way, alerting the Native Americans to dangers, and helping them obtain food. At one time it was thought that the dogs of southeastern Indians were derived from local red wolves. Modern DNA work has disproved this notion by showing that genetics of prehistoric American dogs more closely resemble Old World canids than those found in the New World. The conclusion then is that people brought their dogs with them when they journeyed from Asia into North America.
Especially in Louisiana one breed exists that may have direct ties to the early dogs. The Catahoula Cur, also known as Catahoula Leopard Dog, is a distinctly American breed named after the Catahoula region of our state. Various theories explain the origins of the breed, one of the most romantic being that Indians bred their dogs with those of Spanish explorer Hernando de Soto when he pillaged his way through the Southeast in the 16th century. The truth is buried in time and regardless of the actual genealogy, the result is a unique creolized canine.
Though highly variable in appearance, the stereotypical Catahoula Cur carries a merle gene that expresses itself in a mottled coat of dark gray, black, and white splashed about in a random manner. The most striking features of some individuals are their white, haunting eyes, often called “cracked glass” or “marbled glass” eyes. Early French settlers wrote of the strange looking dogs with glass eyes that were used by Indians for hunting in the swamps.
Jim Bowie is said to have slept with a Catahoula Cur at his feet. Teddy Roosevelt bear hunted with Catahoula Curs. In 1979 Governor Edwin Edwards legally proclaimed the Catahoula Cur the official state dog of Louisiana. Today Catahoula Curs are used for hunting and herding in addition to being demanding pets, and as Louisiana residents their tenure far exceeds ours.
Bayou-Diversity (1 February 2013)Nature, in order to bedizen a stark winter swamp, plants possumhaw (aka deciduous holly) on bayou banks in 62 of 64 Louisiana parishes. Her fruit (only the females produce the red berries) lingers into late winter when the likes of cedar waxwings, bluebirds, and hermit thrushes, having depleted more desirable fare, finally resort to the bitter but dazzling drupes.
Bayou-Diversity (26 January 2013) Eastern Mole – aggravator or aerator? Aldo Leopold, considered the founding father of wildlife conservation in America, was a forward thinking man with a deep understanding of human dependence on healthy, natural ecosystems. He once remarked, “The last word in ignorance is the man who says of an animal or plant: ‘What good is it?’” The mole has been subject to this unmindful query along with a host of other species that are generally considered “pests” or “vermin” such as snakes and predators in general. For those who ask such questions, answers laden with aesthetic values are at right angles with their reality. They are only satisfied with a practical reason to exist. In this vein the mole serves as nature’s roto-tiller to aerate and form soil, and allow percolation of water to deeper roots. One might hope that, when educated, even the most pragmatic would not question the merit of keeping all the parts that maintain human life in good order.
Bayou-Diversity (16 January 2013)Good examples can be discovered in the most unexpected places. Catch a plane to the Central American country of Costa Rica and land at the capitol of San Jose. Get out of town quick because the traffic can be horrendous even with gas at five dollars a gallon. Take a bus northeastward through the vast and mountainous Braulio Carrillo National Park where crashed airplanes have gone undiscovered for weeks. Continue for fifty miles until the hard-surfaced road forks and becomes a narrow cobbled lane. Bounce over this bone-jarring side road for two hours through corporate banana plantations and steadily increasing heat and humidity until it ends on the bank of a roiling, muddy river. Here the tropical rainforests of a real jungle begin. Hire a rustic boat and motor north through a myriad of canals, rivers and lagoons for 27 more miles while flocks of parrots squawk overhead, and howler monkeys scream from somewhere inside the adjacent walls of chlorophyll. Finally, pull ashore at the small native village of Tortuguero. Located on the edge of a national park with the same name, the hamlet of Tortuguero sits astraddle a narrow spit of land bound on the east by the Caribbean Sea and on the west by the river. The people are dark-skinned and speak with a rich Jamaican patois. They thrive in an aquatic habitat where children are not allowed to swim in the ocean because of the sharks nor in the river because of crocodiles. The beaches of the area are best known for harboring the largest concentration of nesting green sea turtles in the western hemisphere. Walk down the wide sidewalk that serves as the main street of this roadless village until you pass the one-room police station. There in the heart of the settlement one can view a genuine “good example.” Four freshly painted containers under a small kiosk are labeled in Spanish for “paper,” “plastic,” “aluminum,” and “glass.” How is it that recycling can occur in the remotest jungle of a small, relatively poor, third-world country and not along the bayou cities and towns in most of Louisiana?
Bayou-Diversity (3 January 2013)Irruption! One of the joys of bird watching is the ever present chance of seeing something new – an unusual or perhaps rare species that suddenly appears unexpectedly. This is possible of course because many birds are great travelers, often flying thousands of miles in the mysterious wonder of migration. Especially in winter, bird watchers across the country hope for the arrival of avian visitors that don’t normally occur in their areas. When numbers of them do visit periodically, the phenomenon is termed an irruption. In North America the species most often associated with winter irruptions include pine and evening grosbeaks, crossbills, purple finches, pine siskins, and even snowy owls. Some of these birds usually spend their winters no farther south than southern Canada or the northern U.S. In the bayou state we are experiencing one such irruption right now. Red-breasted Nuthatches have abandoned their normal haunts in northern coniferous forests and are showing up throughout Deep South states this winter. Please be advised that they are not here for the sun and sand, and their arrival is not a portent for harsh winter ahead. The cyclic occurrences are driven by a scarcity of food on the normal wintering grounds. Red-breasted nuthatches are in Louisiana this year because of a cone crop failure in northern pines, spruces, firs, and larches. The small, short-tailed birds are dependent on seeds in the cones. Happy bird watchers are reporting seeing them all over the state, some at bird feeders stocked with sunflower seeds. As it may be years before they return, watch for these feathered Yankees while they’re here.
Bayou-Diversity (10 December 2012) A special wisdom will vanish with this man and his sort. Knowledge of wild things and their ways accumulated in the laminae of his bones, like tree rings, over a lifetime of seasons, backwaters, spawnings…, and dark moons. His insights are not to be found in the great libraries for they are wordless, and as antipodal examples hampered with the blinders of “education,” we cannot see the fish for the shimmering water. It is also likely that few of his kind will come our way again.
Bayou-Diversity (22 November 2012) SENSES OF THANKSGIVING:
Thank you, O Lord, in this bountiful season for the five senses to relish your world.
Thank you for the succulent smells of the fruits of the earth in the kitchens of our mothers and wives. Thank you for the odor of rich delta dirt on a warm, foggy winter morning. Thank you for the smell of wood smoke, especially that tinted with lightered pine. Thank you for the stew of odors distinct to our rivers and bayous— cypress needles, primal water, mud and decay, life and life to be.
Thank you for the sound of voices of those who came before us and those who will carry our legacies into the future— our parents, grandparents and our children. Thanks for the muffled wings of waterfowl above an overflow swamp and the belligerent snort of a doe at dusk. Thank you for haunting sounds of great horned owls and distant thunder.
Thank you for the taste of spring mayhaws and autumn muscadines in the jellies of a late November Thursday. Thank you for the abundance of other native flavors, subtle and brash— breast of teal, pecans, filet of bass. Thank you for the taste of contentment.
Thank you for the feel of a driving north wind as an Arctic front races for the gulf. Thanks for the textures of sweet gum balls, feathers, gumbo clay, and beech bark. Thank you for the heat of an open fire and the warmth of an open heart.
Thank you for the sight of falling leaves, fattening squirrels, and rising waters that foretell the change of seasons. As the sun approaches the solstice, thank you for lengthy shadows and longer sunsets. Thanks also for fleeting glimpses— of a bobcat at dawn, of a shooting star on a rawboned night, of curiosity on the face of a young grandson.
I pray also, O Lord, for a sixth sense. Grant us common sense to be good stewards of these treasures. Amen.
Bayou-Diversity (18 November 2012) When you hear the wild cry of migrating geese in Louisiana, always look for them. It is your chance to gaze upon an enigma from deep time. Born of Arctic winds and reindeer moss, they drift for 3,000 miles with the tide of eons etched on their DNA that you might glimpse a mystery high above an autumn bayou.
Bayou-Diversity (12 November 2012)In order to save such things, well-meaning economists have tried to place monetary values on wild creatures and natural places. The worth of a bass dinner is calculable, but how does one assess a fresh coat of paint on the soul?
Bayou-Diversity (27 May 2012) Disquieting though it may be for the cloistered wood duck inside the nest box, old man barred owl is intent this morning on a crawfish breakfast from the pond below. He rolls up his britches’ legs to dive-bomb them in the shallows. Being a wise old bird, he prefers only the tails and litters his aerial perches with claws and carapaces like a Saturday night Cajun.
Bayou-Diversity (23 May 2012)Go Native! Stokes’ Aster is a native, perennial sunflower that grows wild in wet pine flatwoods, savannas, and bogs. It loves our acid soils and has evergreen leaves. Pull up a zinnia in your flower bed and plant a Stokes’ Aster.
Bayou-Diversity (17 May 2012)It is that time of the year on the creekbank of a free-flowing stream within the Mollicy Wetlands Restoration Project. As large as your
grandmother’s old enameled wash pan, this spiny softshell lays her ping-pong ball sized eggs on a sandbar once buried in muck because levees stymied the natural flow. Rusted gears of the emancipated ecosystem are beginning to turn once again.
Bayou-Diversity (20 April 2012) This, my favorite tree, is of ancient lineage in the botanical world. Her candelabra arms are seductive in their winter bareness, and oh those voluptuous summertime leaves! They fetch the passion of the tropics to a red clay hill and snare photons on a scale that obliges the buckeyes beneath to wilt with envy. Dressed for a day in the swamp, I don’t dare touch her nectarless flowers. She is from an epoch before proboscised bees and butterflies; her deportment permits pollination only by beetles in black dinner jackets.
Bayou-Diversity (22 March 2012) In 1971 I found a morel in Lincoln Parish that was said by my botany professor at the time to be the first scientific documentation of the mushroom in Louisiana. Today in Union Parish I found 3 more freshly erupted after yesterday’s deluge. They grow here only under upland hardwoods – a scarce commodity in the land of rowed up pine trees. For more than a moment I contemplated these gourmet treats sautéed in butter, but finally skulked away in hopes of a bumper crop next year.
Bayou-Diversity (2 March 2012)Honeysuckle it is not, so DON’T sip the nectar of yellow jasmine as you would the unrelated native coral honeysuckle or invasive Japanese honeysuckle. Yellow jasmine is laden with strychnine-kin alkaloids not conducive to sweet experiences.
Bayou-Diversity (23 February 2012) This damselfly, a fragile forktail, and her mate were photographed in north Louisiana on February 6, the earliest record in the year for this species in the state. Another anecdote in the climate change ledger…
Bayou-Diversity (6 February 2012)Rich in mythology, more than 40 species of crows around the world are considered among the smartest of birds. They are confirmed tool users and also have the ability to recognize individual humans. When addressed this hooded crow in Istanbul declared with a croak that he did not know me.
Bayou-Diversity(17 January 2012)They’re up! The first wildflowers of 2012, white violets display their goods as enticement for sunny day insects interested in an early sip of nectar in return for a bit of inadvertent pollination.
Bayou-Diversity(9 January 2012) Highly refractive crystals behind the retinas of
this gray fox result in eyeshine captured by a trail camera monitoring our compost pile. Her pupils appear to glow yellow as do those of visiting raccoons and stray cats. The scavenging possum, though, glares out of red eyes behind his devilish grin. With the aid of these specialized organs (called tapetum lucidum) many animals can see us much better than we can see them in the dark of the night – a fact that encouraged our ancestors to seek the light of a campfire as the sun set.
Bayou-Diversity (1 January 2012)This 3/4″ white oak acorn has the potential to develop into a living organism that will exceed 100 feet in height, 100,000 lbs. in weight, and 400 years in lifespan. Until just a few years ago white oak was a keystone species in the canopy of Louisiana hill country forests. As a nurturer of wildlife, it has few equals. Today it no longer grows on hundreds of thousands of acres, being replaced by genetically modified pine trees planted in rows and harvested in about 20 years. For a 2012 New Year resolution, perhaps we should strive to appreciate the value of life around us in species other than our own – and in units other than $$$ derived from the likes of pulpwood cords.
Bayou-Diversity (19 December 2011)The lower third of the Mississippi River
experienced the historical record flood this past spring. Spring floods often build on waters in the basin from the preceding winter. Today the Mississippi River at Vicksburg is 25 feet higher than it was a year ago. Just saying…
Bayou-Diversity (12 December 2011) Beauty is in the eye of the beholder, just so long as the beholder is another brown pelican. Officially designated Louisiana’s state bird in 1966, the species in a splash of irony vanished from within our borders that
year due to pesticide poisoning. Since recovered from that calamity, brown pelicans now keep a watchful eye out for signs of actual progress toward coastal restoration.
Bayou-Diversity (28 November 2011) Gray fox can climb trees to escape predators, search for bird nests, and in this case to snack on juniper berries. Earthbound red fox is perhaps more cunning but lacking the ability to climb trees must look up to his arboreal cousin.
Bayou-Diversity (11 April 2011)Louisiana marsh scene – NOT. This is Dalyan Delta on the Mediterranean coast of Turkey with phragmites, needlerush, bitterns, egrets and herons just the same. We call the streams that braid our vital wetlands bayous; there the term is “batakliki kol,” arms of the swamp.
Bayou-Diversity (13 March 2011)Past week’s developments as the angle between our hemisphere and the sun lessens: first damselfly (fragile forktail), first dragonfly (common baskettail), first carpenter bees, first fireflies, first anoles; flowers of pawpaw, sassafras, buckeye, and redbud; fronds of sensitive and cinnamon ferns – phenology all.
Bayou-Diversity (28 February 2011) Gone to garlic. A tenant shack on a former Red River plantation returns to earth. Two miles below the sagging joists the sweet odor of 150-million year old sea life enriches descendants of former landlords. For progeny of the sharecroppers, natural gas in the Haynesville shale formation is as pungent as the herb.
Bayou-Diversity (13 December 2010) Sunlight + Seasons = Autumn’s Water Oak Acorn > Spring’s Wind-thrown Oak > Summer’s Firewood > Winter’s Refuge
Bayou-Diversity (6 December 2010) Frozen Fright – Bayou grackles bedizened in sunlight enspirit a sandbar during daily ablutions. This vulnerable occasion requires vigilance. Was that the shadow of the small lightning hawk?
Bayou-Diversity (29 November 2010) On these dark nights they swim unnoticed down our bayous and rivers bound for a procreative rendezvous thousands of miles away in the Sargasso Sea. Only those American eels several years old and sexually mature feel the tug of the cosmos in every cell. For them it is now a one-way trip to their natal, spawning, and burial grounds. For us it is an enigma too profound to explain with science.