Archive for the ‘herpetology’ Category

A Pre-Historic Sloth-Eating Monster

September 7, 2020

A real monster inhabited the wetlands of South America during the Miocene between 20 million years BP-6 million years BP.  Purussaurus brasiliensis, an extinct 34 foot long caiman, preyed on everything from fish to giant ground sloths.  No complete skeleton of this giant caiman has ever been found, but the size was estimated from several skulls.  It weighed over 10,000 lbs. and was more than a match for any beast living in South America during the time it existed. The few marsupial carnivores that lived then didn’t offer much competition.  It was almost as large as Deinosuchus rugosus, a 39 foot long crocodylian that ate tyrannosaurs during the late Cretaceous.

Purussaurus

Purussaurus was a 36 foot long caiman that lived in South America during the Miocene and preyed on giant ground sloths.

Illustration of purussaurus preying upon a ground sloth.

Recently, scientists examined a fossil arm bone of a giant ground sloth (Pseudoprepothenum) and determined it had 46 tooth marks made by a purussaurus.  At least 6 other species of caiman and crocodiles lived then in South America, but purussaurus was the only species large enough to attack and subdue a giant ground sloth, though this particular specimen was estimated to weigh about 100 lbs. The sloth specimen was found near Iquitos, Peru along with many other fossils of fish, reptiles, and mammals.

Reference:

Pujos, F. and R. Salos-Gismonde

“Predation of the Giant Miocene Caiman Purussaurus on a Mylondontid Ground Sloth in the Wetlands of Proto-Amazonia”

Biology Letters 2020

Another Pleistocene Survivor–The Bird-Voiced Tree Frog (Hyla avivoca)

June 11, 2020

I discovered a new creature in my yard.  Green tree frogs (Hyla cinerea) are abundant here and often sneak into our house, but I was unaware that my yard is also home to the bird-voiced tree frog until I saw the below specimen in my cat’s water dish.  I saw another one a few weeks later.  Most of the time they stay in the tree tops and that is probably why I’d never seen one before, though maybe they had a good few years of reproduction and are on the increase at my locality.  Bird-voiced tree frogs can be green or gray, depending upon the temperature.

Bird-voiced tree frog.

Video of a bird-voiced tree frog call.

Bird-voiced tree frogs have an interesting range distribution.  They likely diverged from their closest living relatives in the Mississippi River Valley and dispersed across Alabama and Georgia.  Their preferred habitat is swampy bottomland forest, and during warm climate cycles this type of habitat is common in the southeast.  The habitat in my yard is a sandhill loblolly pine/sand laurel oak woodland, but McBean Creek bottomland is just about a mile away.  Bird-voiced tree frogs are absent from peninsular Florida.  They may have occurred in peninsular Florida in the past but were extirpated when most of the state was under ocean during marine high stands.

Species Profile: Bird-voiced Treefrog (Hyla avivoca) | SREL ...

Bird-voiced tree frog range map.

I searched the paleobiology database and learned no fossils of this species have ever been found.  A small animal that lives in a forest has a lesser chance of becoming preserved as a fossil.  Leaves turn the soil acid, dissolving bones.  As far as I can determine, no genetic studies of bird-voiced tree frogs have ever been conducted.  It is an understudied species.

An Extinct Map Turtle (Graptemys kerneri) and Pleistocene Sea Level Fluctuations

March 15, 2018

Most species of freshwater turtles can travel overland and occupy new favorable habitat, promoting genetic vigor within the meta population.  They often move between watersheds, and this explains why so many species have such a continuous geographic range.  I’ve seen snapping turtles (Chelydra serpentina) and yellow-bellied sliders (Chrysemys scripta) a considerable distance from any water source.  However, map turtles in the Graptemys genus (10 species) do not travel overland, and their ranges are usually restricted to single river drainages.  So how did closely related Graptemys species colonize different river drainages even though they don’t travel overland?  The dispersal of the Graptemys genus is closely related to Pleistocene sea level fluctuations.

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Barbour’s map turtle is the closest living relative of the extinct Kerner’s map turtle.

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Barbour’s map turtle range.  Note how it is restricted to 1 river system.

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Map of Florida during the Last Glacial Maximum.  Different rivers in Florida isolated by sea level rise today were interconnected on land exposed on the continental shelf due to sea level fall.  This allowed map turtles to colonize adjacent rivers systems where they evolved into distinct species following sea level rise and isolation of populations.

During Ice Ages sea level fell because so much of earth’s atmospheric water became locked in glacial ice.  In Florida dry land habitat extended 120 miles west into the Gulf of Mexico.  Several of Florida’s river systems that are isolated from each other today by sea level rise were interconnected during the Last Glacial Maximum on the land that was exposed by ocean recession.  This allowed an ancestral population of Barbour’s map turtle (Graptemys barbouri), a species today restricted to the Apalachicola-Flint-Chattahoochee River System, to colonize several other rivers in Florida.  Subsequent sea level rise isolated this founder population in the Suwanee, Santa Fe, and Waccasassa Rivers where they evolved into a now extinct species known as Kerner’s map turtle.  Specimens of this species have been found in all 3 of the above mentioned rivers in Florida, and the type specimen (a complete skull) came from the Suwannee.

Kerner’s map turtle had a wider shorter skull than any extant species of map turtle.  Morphologically, it most closely resembles Barbour’s map turtle, the extant species that has the widest shortest skull among living Graptemys turtles.  There is an east-west gradient in the shape of map turtle skulls.  Western species have narrower longer skulls, but map turtle species’ skulls get shorter and wider the farther east they occur.  Kerner’s map turtle was the easternmost species, and it ranged into north central Florida and possibly southeastern Georgia where the Suwannee River headwaters originate.  Rare earth element analysis indicates Kerner’s map turtle lived during the Rancholabrean Age (300,000 years BP-11,000 years BP).  There are no known Graptemys specimens older than the mid-Pleistocene.  The extinction of Kerner’s map turtle likely occurred during a dry climate stage of the mid-Holocene (~6,000 years BP).  Map turtles require fast moving high water where they can disburse up and down rivers.  But drought turns their habitat into stagnant isolated pools that can also be detrimental to their favorite food source–freshwater mussels.  Other species of freshwater turtles and alligators can survive these conditions by moving overland until they find good habitat, but map turtles don’t travel overland.  That’s why most species are restricted to major rivers that rarely, if ever, suffer sporadic flows.

The founding species in the Graptemys genus undoubtedly evolved in the Mississippi River.  Almost all other species exist in other river systems that empty into the Gulf of Mexico.  Pleistocene sea level fluctuations facilitated the colonization and speciation of map turtles in the Apalachicola River drainage, the Guadulupe River System, the Pascagoula River, Mobile Bay drainage, Yellow River System, and Pearl River.  Different map turtle species live in each.  Ocean recession allowed the rivers to become interconnected on the continental shelf, and map turtles were able to colonize adjacent river systems; then sea level rise isolated populations, causing speciation.

Reference:

Ehret, Dana; and J. Bourque

“An Extinct Map Turtle Graptemys kerneri (Testudinae, Emydidae) from the Late Pleistocene of Florida”

Journal of Vertebrate Paleontology 31 (3) May 2011

The Pleistocene Range Extension of the American Alligator (Alligator mississippiensis)

February 4, 2018

Paleontologists excavated 6 artesian springs along the Pomme de Terre River in Missouri before they were inundated by a reservoir about 40 years ago.  They recovered many bones of Pleistocene vertebrates, including the remains of 71 mastodons, along with invertebrate material, plant macrofossils, and pollen.  The scientists published their data in 1 of the papers referenced below.  This is 1 of my favorite studies because the subfossil evidence shows how the local environment changed over time.  During a warm interstadial over 40,000 years ago the region was dominated by hardwood forests of oak, hickory, maple, juniper, dogwood, hornbeam, honey locust, ash, cherry, plum, and Osage orange.  As the climate became cooler and more arid, jack pine and prairie expanded on poor soils, while oak was restricted to richer sites.  When the full glacial maximum struck, the environment transformed into an open spruce parkland landscape where spruce had previously been absent.  The remains of at least 2 alligators were recovered from the deposit dating to the warm interstadial.  This is the northernmost known occurrence in the fossil record of Alligator mississippiensis, and it is approximately 300 miles north of its present day range.  The alligator specimens were found associated with the bones of box turtles, soft shelled turtles, ducks, Harlan’s ground sloth, gopher, giant beaver, raccoon, saber-tooth cat, mastodon, mammoth, horse, tapir, camel, white-tail deer, long-horned bison, and woodland muskox.

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Current range map of the American alligator.  There is a disjunct population in northern Alabama introduced by man but not noted on this map.  Note the northcentral bulge in this species’ range toward its northernmost Pleistocene occurrence in northwestern Missouri.  Pet alligators released in southern Ohio today at approximately the same latitude can survive but can’t reproduce.

The only other possible known occurrence of A. mississippiensis north of its present day range is from Ladds in Bartow County, Georgia; but I think the paper that referenced this did so in error.  The paper (also referenced below) contains a checklist of all vertebrate species known to have occurred in southeastern North America during the Pleistocene, and alligator is noted as being reported from Ladds.  However, I’ve read all the published data about Ladds, and there is no mention of alligator specimens from this site.  The supposed specimen is also not listed in the paleobiology database.  It’s possible (perhaps even probable) alligators occurred in Bartow County, Georgia during warmer climate phases because north Georgia is much lower in latitude than northwestern Missouri where their remains have been found.  If anyone knows of a Bartow County alligator specimen, please contact me.

Some scientists may think the presence of alligators north of their present day range is evidence of temperatures warmer than those of today, but this isn’t necessarily the case. Instead, Ice Ages caused a retraction in the pre-historic range of the alligator, and they perchance have failed to recolonize all of their former stomping grounds.  If average temperatures continue to increase as predicted, alligators may yet expand their range farther north. It’s also possible alligators are able to extend their range during cycles of reduced seasonality.  The earth goes through cycles when it tilts to a lesser degree than it does now causing milder winters but cooler summers.  Annual average temperatures were the same as they are today but more evenly distributed throughout the year.

Alligators are better adapted to colder climate than any other species of crocodilian.  For example during unusual cold spells American crocodiles (Crocodylus acutus) bask in the sun in an attempt to warm themselves and they often perish, but alligators seek shelter in water, and if temperatures drop too much, they live but go dormant.  Adult alligators can survive quite cold temperatures.  In the northern parts of their range alligator reproduction becomes sporadic.  Though adult alligators can survive severe cold spells, juveniles die.  Alligators require several mild winters in a row before their young get large enough to survive an harsh winter.  Cooler summers and springs will result in an all female population–another potential limiting factor in the northern parts of their range.  Alligator eggs in nests with temperatures that fall below 86 degrees F become female.  Nests are warmer than air temperatures due to composting vegetation, but they can still cool, if the surrounding temperatures are low.  Eggs won’t hatch at all when nest temperatures fall below 80 degrees F.  Either decades of severe winters or cool spring/summers or both probably caused the extirpation of the alligator in Missouri during the late Pleistocene.

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Alligator brumating (going dormant) in ice.

The American alligator is an extremely adaptable species having survived countless climatic changes.  It has existed relatively unchanged as a species for at least 5 million years.  Scientists aren’t even able to discern a definite difference between modern alligators and fossil specimens from 5-12 million years old, so the American alligator may be a 12 million year old species.  Alligators from the early Miocene are assigned to a different species (A. olseni), and this is the probable ancestor of the modern day alligator.  A. olseni specimens have been found in Tennessee, but climate was much warmer during the early Miocene than it is today.

Reference:

King, James; and Jeff Saunders

“Environmental Insularity and the Extinction of the American Mastodont”

in Quaternary Extinctions: A Prehistoric Revolution  edited by Paul Martin and Richard Klein

University of Arizona Press 1984

Russell, D.A.; F. Rich, V. Schneider, J. Lynch-Stieglitz

“A Warm Thermal Enclave in the Late Pleistocene of the Southeastern U.S.

Biology Reviews 84 (2) May 2009

Pterosaurs may have Cared for their Young

January 11, 2018

Some imagine the Cretaceous and Jurassic Ages as a time when the earth was strange and full of terrifying monsters.    The earth was a vast wilderness then, dangerous perhaps for most creatures, but it was no more strange or terrifying than the world we live in today–the Anthropocene with its genocides, terrorism, potential nuclear war, and extensive environmental destruction caused by a single dominant species.  The dinosaur world hosted species different from those of modern day earth, but these organisms were part of ecosystems recognizably comparable to those of today.  For example fish-eating pterosaurs nested in communal colonies, not unlike present day heron and egret rookeries.  Pterosaurs were not dinosaurs but instead were flying reptiles–the only vertebrates besides birds and bats to evolve the ability to fly. After their initial evolution the early Jurassic pterosaurs radiated into many species and occupied different ecological niches.  From the middle of the Jurassic until their extinction at the end of the Cretaceous 66 million years ago, there were probably about as many species of pterosaurs living in the world as there are birds today.  Evidence from 1 site in northwest China suggests pterosaurs, like so many modern day vertebrates, cared for their young.

Paleontologists found 215 fossilized eggs of a species of pterosaur known as Hamipterus tianshanensis, a fish-eating species that nested communally.  The fossils from this site date to about 120 million years BP, and they are from many generations. The nests were located next to a lake at the time of deposition.  Apparently, pterosaurs used this site annually.  Perhaps it was difficult for predators to access.  Some of the eggs contain visible embryos.  The embryos show well developed legs but underdeveloped wing bones.  This suggests the hatchlings couldn’t fly and depended upon parental care for food until their wings developed.  However this conclusion isn’t certain.  The fossils are of an embryonic stage, not actual hatchlings.  The wing bones may have developed at a later embryonic stage.

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Artist’s representations of pterosaurs have changed over the years.  In this old issue of Green Lantern from the early 1970s the pterosaur is larger than a man, featherless, and conveniently yellow.  Green Lantern’s power ring doesn’t work against yellow objects.  The wingspans of some species of pterosaurs were longer than the length of a man, but they could not have seized and carried a man away.  They were able to leap straight up and fly though, unlike large modern bird species which must take a running start.

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This more modern representation of pterosaurs by Masato Hattori, a depiction of Hamipterus tianshanensis, shows the reptile covered with hair-like feather structures.  It also had teeth.

Cretaceous-aged outcroppings occur near Columbus, Georgia and the Chattahoochee River.  These are the only regions in the state where Cretaceous fossils have been found.  David Schwimmer, a professor at Columbus State, excavated 3 pterosaur wing bones from an outcropping here–the only evidence pterosaurs formerly existed in the state.

References:

Deeming, Charles

“How Pterosaurs Bred”

Science 358 (6367) December 2017

Wang, Xi; et. al.

“Egg Accumulation with 3-D Embryos Provides Insights into the Life History of a Pterosaur”

Science 358 (6367) December 2017

Alligators vs Sharks

October 15, 2017

Bloody battles between hundreds of alligators and sharks were an oddity of nature that occurred infrequently for millions of years.  Alligators are considered a freshwater species, but they do inhabit brackish lagoons and can even live in saltwater environments for weeks.  Alligators foraging near beaches normally prey on fish, shrimp, crabs, wading birds, raccoons, mink, and sea turtles.  Alligators take advantage of weather and tidal conditions that concentrate their prey in confined areas.  During the year 1877 near Jupiter, Florida a strong flood tide trapped a large number of fish in a bend of a tidal inlet, attracting an estimated 500 alligators.  The alligator feeding frenzy lasted for days, and the blood drew hundreds of sharks into the main channel of the inlet.  The current shifted and carried the alligators into the main channel where they fought sharks for hours.  Dead alligators and sharks washed ashore for days, following the battle.  It is unlikely such a spectacle could occur today.  Sharks have been overfished, greatly diminishing their population, and alligators, though on the increase, will never be as abundant as they were when Florida was mostly wilderness.  However, the primeval world was the scene of many alligator vs shark wars because they co-existed for millions of years, often competing for the same prey.  Alligators are a member of the crocodilian family.  The crocodilians evolved at least 83.5 million years ago, and the ancestors of the crocodilians, the Pseudosuchia, originated 250 million years ago.  The ancestors of the alligator’s ancestors undoubtedly came into conflict with sharks.  It’s an ancient rivalry.  Spectacular battles between large groups of alligators and sharks may no longer occur, but individual crocodilians and sharks still eat each other on occasion.

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Alligator preying on a nurse shark at the Ding Darling National Wildlife Refuge near Sanibel, Florida.  This photo is on the cover of this quarter’s Southeastern Naturalist.

An article published in this quarter’s Southeastern Naturalist collects all the known incidences of alligators preying on sharks and vice versa. On Wassaw Island, Georgia a scientist saw an alligator prey upon a bonnethead shark, and he also witnessed another alligator catch and eat a lemon shark.  A case of an alligator preying on a bonnethead took place at St. Mark, Florida as well.  Bonnetheads feed on crabs in shallow water, making them vulnerable to alligator attack.  The photo above shows an alligator preying on a nurse shark. Sharks have been recorded feeding upon bottom-dwelling southern and Atlantic stingrays, and stinging barbs are occasionally found embedded in alligators.

There are no recent incidents of known shark attacks on alligators, but there are 3 records from the late 19th century, including the account mentioned in the first paragraph.  In addition to that account a shark bit an alligator in 2 near Pilot Cove, Florida in 1884, and in 1888 5 or 6 alligators battled a similar number of sharks in the Indian River, resulting in some deaths of both.

Around the world there are numerous cases of crocodiles and sharks eating each other.  Bull sharks venture into fresh water and have been recorded falling victim to Australian salt water crocodiles.  Crocodile remains have been removed from the stomachs of tiger sharks near Australia, South Africa, and Indonesia.  Caimans filled the belly of at least 1 tiger shark off the coast of South America.

Who wins a fight between an alligator or crocodile and a shark?  It depends upon the size of the individual and who bites who first.  The larger individuals have the bigger bite and the advantage, but if they are close to the same size, the first to deliver a serious bite quickly gains the upper hand.

*Note the title of the reference below.  The dispassionate scientifically proper language amuses me to no end.  Translated into layman’s English it means alligators and sharks eating each other.

Reference:

Nifong, James; and Russel Lowers

“Reciprocal Intraguild Predation between Alligator mississippiensis (American alligator) and Elasmobranchiii in Southeastern United States”

Southeastern Naturalist 3 (16) 2017

The Frog that ate Dinosaurs

September 28, 2017

The horned frogs of South America are often called pacman frogs because they can swallow prey as large as themselves.  Unlike all other frogs and toads, they bite and have powerful jaws attached to sturdy skulls.  Horned frogs (Ceratophys cranwelli) are probably related to an extinct frog (Beezelebufo ampinga) that lived on Madagascar during the late Cretaceous.  The anatomy between these species is similar.  Moreover, during the Cretaceous Madagascar, Africa, Antarctica, and South America were 1 continent; so a close evolutionary relationship makes sense.  Beezelebufo was much larger than extant horned frogs, reaching a weight of at least 9 pounds.  The largest living frog in the world today is the goliath frog (Conrauo goliath) of Africa, and it grows to just 7 pounds.  But Beezelebufo had a much more powerful bite.

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Beelzebufo was big enough to eat dinosaur hatchlings.

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The goliath frog is the largest living species of frog in the world.  Beelzebufo was over 20% larger.

Scientists measured the bite force of modern day horned frogs and used this to extrapolate the bite force of beezelebufo.  They estimated beezelebufo could bite as hard as a lion or tiger and harder than a wolf.  They could also bite harder than juvenile crocodilians of the same size.  Available fossil material of beezelebufo consists of individuals that were still growing at the time of deposition.  If full grown adult material is discovered and used for extrapolation, it’s possible scientists will determine adult beezelebufos had an even more powerful bite.  The authors of the below referenced paper believe beezelebufo fed upon dinosaur hatchlings and juvenile crocodilians.  Most frogs use their sticky tongues to capture prey, but horned frogs and their large extinct cousin clamp (or clamped) down with their powerful jaws.

Video of a horned frog (aka pacman frog) eating a mouse.  This species is related to the extinct beezelebufo, a frog that ate dinosaurs.

Video of bullfrog stalking and eating a sparrow.  Beezelebufo probably stalked dinosaur hatchlings at water’s edge.  Frog predation on dinosaurs continues today.  Most paleontologists believe birds descend from dinosaurs and birds are just modern day versions of dinosaurs.

Reference:

Lappin, A. Christopher; et. al.

“Bite Force in the Horned Frog (Ceratophys cranwelli) with Implications for Extinct Giant Frogs”

Scientific Reports 7 2017

 

Rapid Anole (Anolis carolinensis) Evolution

August 21, 2017

Misinformed creationists some times ask, if evolution is true, why isn’t it happening now?  There is a simple answer to that question.  Evolution is an ongoing process, and it IS happening now.  Evidence of continuing evolution isn’t readily apparent to the non-observant eye because usually it is a slow process–evolution often requires generations of natural selection to influence the phenotypical changes that demonstrate it.  However,  scientists discovered an example of evolution that occurred within 1 generation of an anole population in south Texas.  A team of scientists had recently studied the differences in cold tolerance between the population of anoles that live in south Texas with those that live near the northern limits of their range.  The south Texas anoles lose muscular coordination when temperatures drop to about 51 degrees F, while anoles near the northern limits of their range lose coordination when temperatures reach 43 degrees F.  An unusual cold snap struck south Texas shortly after scientists gathered this data, and they took another look at this anole population.  They discovered that exposure to cold temperatures changed the DNA of south Texas anoles.  4 genomic regions, especially those related to nervous system function, changed.  The lizards had rapidly evolved the ability to retain muscle coordination at lower temperatures, and they will pass these genetic changes on to the next generation.  This is a perfect example of evolution, defined as the change over time in the genetic characteristics of a population.  Most creationists can’t even define evolution.  They reject the fundamental basis of all biological science because it interferes with their belief in the supernatural.  Let’s see them try to deny this case study.

Anole characteristic threat display.

Anoles are a successful and rapidly evolving species. Some populations have adapted to city living, having evolved stickier toe pads that enable them to climb window glass.  In Florida the brown Cuban anole was accidentally introduced.  They occupy the same niche as the American anole.  In areas colonized by this alien anole, native anoles evolved larger toes that allow them to climb thinner branches.  This occurred in less than 15 years (20 generations for anoles living in Florida).  So now, areas with both species of anoles have a niche partition–Cuban anoles occupy lower branches, while native anoles live in the tree tops.

Worldwide, there are 391 species of anoles, but 9 are closely related to the species (A. carolinensis) that is widespread in the southeastern U.S.  Genetic studies suggests all 9 of these species descend from a founder population originating on Cuba.  A. carolinensis diverged from western Cuban anoles about 6 million years ago.  This occurred as a rafting event when a tropical storm washed debris from Cuba to the Gulf Coast of North America.  At least 1 male and 1 female were clinging to the debris when it made landfall.  All Caribbean islands were populated by anoles originating on Cuba from similar rafting events.

Fossil evidence of anoles has been excavated from 1 site in Georgia (Ladds), 1 site in Alabama (Bell Cave), and 10 sites in Florida.  None date to older than the mid-Pleistocene, but genetic evidence indicates they’ve occurred in southeastern North America since the late Miocene.

References:

Campbell-Staten, Shane; et. al.

“Winter Storms Drive Rapid Phenotype, Regulation, and Genome Shift in the Green Anole Lizard”

Science August 4, 2017

Glor, Richard; J. Losos, A. Larso

“Out of Cuba: Overwater Dispersal and Speciation Among Lizards in the Anolis subgroup”

Molecular Ecology 14 2005

100 Species of Reptiles and Amphibians along the Altamaha River, Georgia

July 17, 2017

The corridor along the Altamaha River drainage is the best remaining wilderness in Georgia.  The land here is protected by 11 state wildlife management areas and 2 private landowners.  The Nature Conservancy owns Moody Forest, and the Orianne Indigo Snake Society owns land that hosts the greatest variety of reptiles and amphibians in the state.  Scientists have recently begun studying this largely undeveloped corridor.  From 2008-2016 scientists conducted the first comprehensive survey of reptiles and amphibians along this river system.  They used intensive group searches, turtle traps, and drift fences to find species; and they listened for frog calls.  Drift fences are barriers interspersed with pitfall traps.  Smaller reptiles and amphibians attempt to go around the barriers and fall into the traps.  Surveyors collected an astonishing 100 species, indicating the region has the richest diversity of reptile and amphibian species in the state.  Fort Stewart army base ranks 2nd with 97 species, and the Okefenokee Swamp hosts 88 species.

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Map of the Altamaha River Drainage.  The Altamaha is fed by 3 major tributaries–the Oconee, Ocmulgee, and Ohoopee.

Scientists catalogued 59 species of reptiles and 41 species of amphibians along the Altamaha River.  This number includes 17 species that are considered endangered by the federal and/or state governments, including indigo snake, diamondback rattlesnake, southern hog-nosed snake, rainbow snake, harlequin coral snake, pine snake, pine woods litter snake, slender glass lizard, mole skink, gopher tortoise, spotted turtle, southern dusky salamander, and gopher frog.

Surprisingly, cottonmouth water moccasins were found at less than half the sites surveyed, and they were absent from the main branch of the river.  The authors of this study suggest regular flooding “scours” riverside vegetation, eliminating the cover favored by the venomous snakes.  On the other hand river cooters (Pseudemys concinna) were found to be abundant in the river, though according to the preceding scientific literature they were not known to be present here.

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River cooters are common in the main branch of the Altamaha River.  Before the below referenced survey was conducted, reptiles and amphibians along this river were so little studied, this species was unrecorded in the scientific literature as living in the river.

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Red salamanders (Pseudotriton ruber) reach the southeasternmost limit of their range at the Altamaha River.  This waterway is a geographical barrier for 14 species of reptiles and amphibians.

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The pine woods litter snake (Rhadinia flavilata) reaches the northern limit of its range at the Altamaha River.  This species grows to about 1 foot in length and mostly lives underground.  They are venomous but have rear fangs that are probably unable to break human skin.  They feed on small reptiles and amphibians and are no danger to people.

The reason such a high diversity of species occurs along the Altamaha River is the great variety of habitats.  The corridor hosts open water, bottomland hardwoods, cypress/tupelo swamps, longleaf pine savannahs, sandhills, Carolina Bays, and muddy seepage areas at the bottom of north-facing slopes.  However, the river itself serves as a barrier blocking movement of some species’ populations.  The Altamaha River is the southeasternmost range limit for 13 species, and the northernmost range limit for 1 species.

The high number of reptile and amphibian species is evidence the region of the Altamaha River has been climatically stable for millions of years.  The vicissitudes of Pleistocene climate fluctuations were muted here.  During cold arid stadials swampy wetlands shrunk in size but persisted as relics, while savannahs and scrubby sandhill habitat expanded.  Currently, wetland habitat has expanded but before European settlement grassland and scrub habitat were still extensive.  Western Georgia and Alabama have also experience long term climatic stability.  (See:

https://markgelbart.wordpress.com/2015/04/28/the-pleistocene-ridge-and-valley-reptile-corridor/

https://markgelbart.wordpress.com/2015/08/21/extralimital-species-of-pleistocene-aged-turtle-remains-found-in-the-upper-coastal-plain-of-alabama/

)  Like the black prairie region of Alabama, the Altamaha river also undoubtedly served as a refuge for species of reptiles whose current range was obliterated by an ice sheet during Ice Ages.  Blanding’s and wood turtles may have extended their range this far south then.  Extinct giant tortoises (Hesperotestudo crassicutata and H. incisa) likely lived alongside their smaller cousin, the gopher tortoise.  But otherwise the modern species list of reptiles and amphibians in the region is mostly unchanged from the Pleistocene.

Reference:

Stevenson, Dirk, and Houston Chandler

“The Herpetofauna of Conservation Lands along the Altamaha River, Georgia”

Southeastern Naturalist 16 (2) 2017

Musk Turtles (Sternotherus odoratus) Prefer Buffalo Wings

July 12, 2017

Buffalo chicken wings exploded in popularity when the Buffalo Bills kept losing Super Bowls almost 30 years ago.  The meaty spicy snacks are the perfect drinking party food.  The heat makes a drinker thirsty, yet the fat and protein slow down absorption of alcohol.  The chicken wings are fried, then tossed in a sauce made of butter or margarine mixed with hot pepper vinegar.  Supposedly, Buffalo wings were invented by Teressa Bellissimo at Anchor Bar in Buffalo, New York during 1964.  However, Anchor Bar didn’t serve Buffalo wings until 1974.  Instead, credit for inventing the dish should probably go to John Young, a native of Alabama, who moved to Buffalo and made spicy chicken wings during 1964.  He seems the more likely originator of the dish because Buffalo wings resemble the kind of Cajun or soul food cooking that might be found in south Alabama.  Cajun and soul food cuisine make excellent use of throw away ingredients. Before the wing craze they were considered a disposable part of the bird.

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2 stinkpot (aka musk turtles) mating in Woodbridge Lake, Evans, Georgia.  Scientists discovered they prefer Buffalo chicken wings over any other bait.

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Buffalo wings–favorite bait of the stinkpot turtle.

Musk turtles (also known as stinkpots because of their smelly defense glands) like to eat Buffalo chicken wings.  Scientists studying musk turtles at Comal Springs, Texas compared the effectiveness of various kinds of baits.  Musk turtles greatly prefer Buffalo chicken wings over fried chicken, raw chicken, catfish stink bait, cat food, potted meat, and canned sardines in oil.  The experiment took place in 2 phases.  Phase 1 compared Buffalo chicken against the non-chicken baits.  Phase 2 compared the Buffalo wings against fried and raw chicken.  Scientists captured 231 musk turtles using Buffalo wings compared to just 45 using stink bait, cat food, potted meat, and sardines.  Scientists captured 46 musk turtles using Buffalo wings vs 16 with fried chicken and 10 with raw chicken.  Musk turtles, like people, are attracted to grease and spice.  Turtles agree: they taste better than their natural diet of crayfish, snails, clams, tadpoles, and insects.

Reference:

Munscher, Eric; et. al.

“A Novel Bait for Capturing Eastern Mud Turtles”

Southeastern Naturalist 16 (2) 2017