Friday, January 31, 2014

Cane toads adapt rapidly to cool temperatures and are invading high elevation in New South Wales

A forthcoming paper in Function Ecology by McCann et al. (2014) rerports the cane toad, Rhinella marina has now reached areas much colder than most of its native range in tropical America.

In northeastern New South Wales, cane toads have been recorded up to 1100 m above sea level (asl). The authors monitored the toad over the summer 2012 -2013 and confirmed that ground temperatures were lower at three high-elevation (750 to 1010 m asl) sites than at two nearby lower (100 to 210 m asl) sites. During the day 18 vs 25°C; and at night, 17 to 18 °C vs 20 to 25°C respectively.

Critical thermal minima (CTmins) of field-collected toads (loss of the righting reflex) were lower for high-elevation than low-elevation toads (5.5 vs 7.5°C), but laboratory acclimation erased this difference. A toad's CTmin was not affected by site of collection, nor by one month's exposure to warm (24°C) or cool (12°C) conditions; instead, a toad's CTmin was determined by its thermal exposure over the previous 12 h. Locomotor ability was affected by test temperature, by elevation, and by acclimation. Toads from high elevations exhibited equal endurance at cold and warm test temperatures after month-long acclimation to cold conditions, whereas toads from low elevations performed better at high temperatures regardless of previous temperature treatments.

Cane toads at the southern edge of their expanding Australian range can function under cool conditions by adjusting their thermal tolerance within a few hours of encountering low temperatures.

The toads’ ability for rapid thermal acclimation suggests that current models underestimate the potential range of abiotic conditions accessible to this invasive species.

McCann S, Greenlees MJ, Newell D, Shine R. 2014. Rapid acclimation to cold allows the cane toad to invade montane areas within its Australian range. Functional Ecology DOI: 10.1111/1365-2435.12255

Leatherback movements associated with food

Previous studies of leatherback turtles have analyzed surface movement patterns using only surface covariates. Since turtles and other marine predators spend the vast majority of their time diving underwater, an analysis of movement patterns at depth should yield insight into what drives their movements.

Photo credit DivingSeaSafari
In a new paper Scihick and colleagues (2013) analyze the movement paths of 15 post-nesting adult female Pacific leatherback turtles, which were caught and tagged on three nesting beaches in Mexico. The temporal length of the tracks ranged from 32 to 436 days, and the spatial distance covered ranged from 1,532 km to 13,097 km. The tracks were studied using a movement model designed to yield inference on the parameters driving movement. Because the telemetry data included diving depths, the authors extended an earlier version of the model that examined surface only movements, and analyze movements in 3-dimensions.

They tested the effect of dynamic environmental covariates from a coupled biophysical oceanographic model on patch choice in diving leatherback turtles, and compared the effects of parameters measured at the surface and at depth. The covariates included distance to future patch, temperature, salinity, meridional current velocity (current in the north–south direction), zonal current velocity (current in the east–west direction), phytoplankton density, diatom density, micro-plankton density, and meso-zooplankton density.

They found significant correlation between movement and the parameters for oceanic covariates in eight of the tracks. Of particular note, for one turtle they observed a lack of correlation between movements and a modeled index of zooplankton at the surface, but a significant correlation between movements and zooplankton at depth. Two of the turtles express a preference for patches at depth with elevated diatoms, and two turtles prefer patches with higher mezozooplankton values at depth. In contrast, four turtles expressed a preference for elevated zooplankton patches at the surface, but not at depth.

The authors suggest that our understanding of a marine predator’s response to the environment may change significantly depending upon the analytical frame of reference, that is whether relationships are examined at the surface, at depth, or at different temporal resolutions. They also tested the effects of accounting for ocean currents on the movement patterns and found that for 13 of the 15 turtles, the parameter governing distance to the next patch decreased.

Citation
Schick RS, Roberts J, Eckert  S, Clark  J, Bailey H, Chai F, Shi  L & Halpin  P 2013 . Pelagic movements of pacific leatherback turtles (Dermochelys coriacea) reveal the complex role of prey and ocean currents.  BMC Movement Ecology  1(11).

Capitol Hill wants to regulate snakes

The following story by Michael Bastasch from is from the Daily Caller

Ever wanted to have a pet snake? Well, that could get a little harder soon. It looks like the snakes on Capitol Hill are teaming up with animal rights activists to make it harder for people to keep certain types of snakes as pets.

A bipartisan group of lawmakers sent a letter to the U.S. Fish and Wildlife Service to urging the agency to list the reticulated python, the DeSchauensee’s anaconda, the green anaconda, the Beni anaconda and the boa constrictor as “injurious species” under the Lacey Act. Such a listing would mean these snakes could not be imported or transported within the U.S.

Animal rights activists at the Humane Society support this designation, sending an email around quoting the lawmakers’ saying that these five snakes “pose a risk to the safety of the American people and threaten some of our nation’s most treasured natural habitats. Since 1990, twelve people died from encounters with ‘pet’ constrictor snakes, including two toddlers who were strangled in their cribs.”
Lawmakers have voiced similar concerns, arguing that these snakes are invasive and can damage local ecosystems and put a burden on taxpayers because federal officials have spent $6 million since 2005 combating Burmese pythons and other constrictor snakes in Florida.

“Yet, these predators continue to consume endangered and threatened species, kill family pets in residential neighborhoods, and have decimated almost 99 percent of Everglades’ small and medium sized native mammals,” reads the letter from lawmakers led by Oregon Democratic Rep. Peter DeFazio and Florida Republican Rep. Mario Diaz-Balart.

Lawmakers also cite a U.S. Geological Survey report saying that nine species of exotic constrictor snakes present a “high” or “medium” risk of becoming invasive species because of how easily they can escape from cages or because of owners releasing their pets into the wild. Four out of nine of these constrictors were listed as “injurious” under federal law, and now lawmakers want the other five to also be listed.

Reptile enthusiasts and owners, on the other hand, say this is a case of federal overreach and that local snake problems should be handled by the states, not the feds. A listing under the Lacey would not only ban importing and interstate trade of the snakes, but also intrastate trade where there is no existing state law on the matter — crippling the thousands of small, family-owned reptile businesses across the country.

“We believe that the listing of these constrictor snakes, which have been in the country for decades and are widely held as pets, is a one size fits all approach to a problem that at best is limited to the very southern tip of Florida,” Joan Galvin, a spokeswoman for the U.S. Association of Reptile Keepers, told The Daily Caller News Foundation.

Galvin added that most of the constrictor snakes being held as pets are bred to be certain colors and patterns, called “morphs”, meaning they would not even be able to blend into their ecosystems when released. This is on top of the snake’s inability to survive in climates that can drop into the 40s.

“The state of Florida, to their credit, has already addressed the issue at the state level at the initiative of their state wildlife management agency,” Galvin said. “We believe that is appropriate and that the use of the Lacey Act to prohibit the ownership of animals widely held as pets throughout the country is federal overreach, not supported by the science and would cause significant economic harm to those in the industry.”

A new on-line herp journal from CNAH

The Center for North American Herpetology (CNAH) has announce the launch of their new  journal – The Journal of North American Herpetology. The Journal of North American Herpetology (JNAH) (ISSN 2333-0694) provides an open access on-line venue with the use of all modern digital technologies for peer-reviewed contributions of all aspects of North American Herpetology within the geographic boundaries of the United States and Canada. JNAH is a continuation of the very first herpetological on-line peer reviewed journal Contemporary Herpetology (1998-2009), which can be accessed from the JNAH web site.

Co-editors and CNAH Board Members Walter Meshaka and Dan Fogell along with Managing Editor and CNAH Director Travis Taggart  worked diligently over the past year preparing this new journal.  JNAH will continue to publish manuscripts in this volume throughout 2014 as they are received, reviewed, and readied for publication. Subsequent announcements will be released each time an article is prepared for publication.

The premiere issue, Volume 2014(1), can be accessed by visiting the JNAH web site at http://jnah.cnah.org and includes the following authors and titles:

J. Whitfield Gibbons and Michael Dorcas – What is a herpetologist and how can I become one?
Jason T. Cotter and Chris A. Sheil – Hatchling sex ratios and locomotor performance of Midland Painted Turtles (Chrysemys picta marginata).

Walter E. Meshaka and Pablo R. Delis – Snake assemblage structures and seasonal activity patterns on a military base in south-central Pennsylvania: Land management implications for snake conservation.

Malcolm L. McCallum and Jamie L. McCallum – Ecological release of an exotic species upon suppression of its invasive predator: A five-year case study, with notes on other species, and the life history of the Mediterranean Gecko, Hemidactylus turcicus.

Brian S. Gray – Natural history of Dekay’s Brown Snake, Storeria dekayi (Holbrook, 1836), at a site in northwestern Pennsylvania.

Eric J. Gangloff, David Bertolatus, Christopher Reigel and Jennifer L. Gagliardi-Seeley – Effects of sex, environment, and condition on the musking behavior of sympatric gartersnakes (Thamnophis Spp.).

R. Nicholas Mannan, Gad Perry, David E. Andersen, and Clint W. Boal – Call broadcasting and automated recorders as tools for anuran surveys in a subarctic tundra landscape.

Cody N. Grasser and Geoffrey R. Smith – Effects of cover board age, season, and habitat on the observed abundance of Eastern Red-backed Salamanders (Plethodon cinereus).

Vanessa C.K. Terrell, Jaimie L. Klemish, Nathan J. Engbrecht, John A. May, Peter J. Lannoo, Rochelle M. Stiles, and Michael J. Lannoo – Amphibian and reptile colonization of reclaimed coal spoil grasslands.

Neil Dazet and Don Moll – Chemical signals in vertebrate predator-prey systems involving Common Musk Turtles, Sternotherus odoratus, and their predators.

Brian K. Mealey, John D. Baldwin, Greta B. Mealey, Gregory D. Bossart, and Michael R. J. Forstner – Characteristics of Mangrove Diamondback Terrapins (Malaclemys terrapin rhizophorarium) inhabiting altered and natural mangrove islands.

Monday, January 27, 2014

Ripples in the water and the male tungara frog

Ripples continue for several seconds after a male 
tungara frog has stopped calling. Photo credit: Ryan Taylor.

As the male túngara frog serenades female frogs from a pond, he creates watery ripples that make him easier to target by rivals and predators such as bats, according to researchers from The University of Texas at Austin, the Smithsonian Tropical Research Institute (STRI), Leiden University and Salisbury University.

A túngara frog will stop calling if it sees a bat overhead, but ripples continue moving for several seconds after the call ceases. In the study, published this week in the journal Science, researchers found evidence that bats use echolocation -- a natural form of sonar -- to detect these ripples and home in on a frog. The discovery sheds light on an ongoing evolutionary arms race between frogs and bats.

The male túngara frog (Physalaemus pustulosus), native to Central and South America, spends his nights calling from shallow ponds, attempting to attract the attention of a mate. Yet his call, which is based on a pattern of "whines" and "chucks," inadvertently creates a multisensory display that can be exploited by both friend and foe.

As the amorous amphibian calls out, his vocal sac continually inflates and deflates, like a pulsing balloon. This pulsating sac creates a visual cue, but also creates a third signal -- ripples in the surface of the pond.

"A general theme of this research is that the way we communicate with any kind of a signal is by creating a disturbance in the environment," said Mike Ryan, co-author on the study and professor in the Department of Integrative Biology at UT Austin. "When we vocalize, we're causing changes in the air pressure around us and that's what our ears hear. When we use visual signals, light bounces off whatever pigments we're using and is transmitted to the receiver. Anything we do disturbs the environment, whether it's intended as a communication signal or not."

The researchers found that frog-eating bats (Trachops cirrhosus) were much more likely to attack a target that had both frog calls and ripples radiating from it than one with frog calls and no ripples. This suggests that they can detect these ripples, most likely with echolocation. However, bats appear to lose this advantage if the area around the frog is cluttered with leaf litter, which may stop the ripples from propagating.

"The interesting thing is that these frogs have evolved a strategy to escape predation," said lead author Wouter Halfwerk, a postdoctoral researcher at UT Austin who is also affiliated with STRI and Leiden University. "When a frog detects the shadow of a bat overhead, his first defense is to stop calling immediately. Unfortunately for the frog, the water ripples created by his call do not also stop immediately. The ripples continue to emanate out for several seconds, creating a watery bull's-eye on the frog. Bats use the ripples, thereby beating the anti-predator strategy."

On the other hand, the ripples seem to enhance the response of rival male frogs to the initial caller.
The researchers found that when a call was accompanied by ripples, other male frogs were more likely to respond than if the call was broadcast by itself. In addition, when they did respond, they did so with more gusto.

If a call accompanied by water ripples was outside a male's zone of defense, a circle about 15 cm across, rival males would call more than twice as fast as they would if they just heard the initial call by itself. If the call, again with ripples, was inside their territory rival frogs tended to call less, often stopping altogether and deflating their vocal sacs, presumably getting ready to rumble or run.

W. Halfwerk, P. L. Jones, R. C. Taylor, M. J. Ryan, R. A. Page. Risky Ripples Allow Bats and Frogs to Eavesdrop on a Multisensory Sexual Display. Science, 2014; 343 (6169): 413 DOI: 10.1126/science.1244812

Schouteden’s sun snake, Helophis schoutedeni a forgotten aquatic snake from central Africa

Heliophis schoutedeni. Photo credit Vaclay Gvozdik.
The Schouteden’s sun snake Helophis schoutedeni is the sole member of the genus, and was originally described by the Belgian herpetologist Gaston-François de Witte in 1922 as Pelophis schoutedeni. Twenty years later, the new generic name Helophis was established by de Witte and Laurent because the generic name Pelophis was preoccupied by Pelophis Fitzinger, 1843.  De Witte and later de Witte & Laurent (1942) provided data on two syntypes both collected by Henri Schouteden in 1921. In the original description, De Witte & Laurent also reported a third specimen from Léopoldville (today Kinshasa), which was collected in 1937 by Henrard. Since then, this snake species was all but forgotten, left out of field guides and faunal lists. And, the genus has remained monotypic.

In a recent article Nagy and colleagues (2014) report on a fourth specimen of this snake collected during a field expedition to the Democratic Republic of the Congo in June–July 2012. The authors  obtained the snake in Kinshasa, in proximity of the Congo River.

Ecologically, Helophis schoutedeni is a semi-aquatic snake as suggested by its dorsally-oriented nostrils, narrow triangular internasals, small eyes with round pupil and stout body. And, during a short period in captivity, the snake preferred to stay in water. Helophis is morphologically similarity to the genus Hydraethiops another poorly known aquatic snake from Africa.

The photos here are most like the first ones take of live specimen of this species.

Citation
NAGY, Z. T., GVOŽDÍK, V., & MEIRTE, D. (2014). New data on the morphology and distribution of the enigmatic Schouteden’s sun snake, Helophis schoutedeni (de Witte, 1922) from the Congo Basin. Zootaxa, 3755(1), 096-100.

Taxonomic changes for two shieldtailed snakes in the genus Uropeltis


Uropeltis madurensis. Photo credit SR Ganesh.
Burrowing snakes remain the most difficult serpents to study and undoubtedly represent a disproportionately large percentage of undescribed taxa.  Burrowing species are found in many different clades, and a few clades contain only burrowing species. The shieldtail snakes of the family Uropeltidae are dedicated burrowers inhabiting southern India and Sri Lanka. The family contains about 60 species in eight genera, all are small to medium-sized, use wet hill forest and are viviparous. Most seem to feed on earthworms.

The genus Uropeltis has 26 valid species and is thought to have a confused  taxonomy in need of revision. In a new paper Ganesh and colleagues (2014) elevate Uropeltis arcticeps madurensis to species level, and revive Silybura shortti (in the combination Uropeltis shorttii) from the synonymy of Uropeltis ceylanicus.

Uropeltis shorttii is restricted to the Shevaroy Hills,  part of southern Eastern Ghats located in Tamil Nadu.  Today the area is heavily cultivated with coffee and silver oak but has  remnant patches of tropical evergreen cloud forests that harbor wet-forest taxa such as  the endemic Yercaud Day Gecko Cnemaspis yercaudensis.  A live specimen was encountered in an area of silver oak, coffee plantations and small patches of evergreen forests in Yercaud (1550m) at the summit of Shevaroys.  The only other Uropeltis occurring with U. shorttii is U. ellioti, an apparently widespread species belonging to a different species group.

Uropeltis madurensis is endemic to HighWavys-Varushanad-Periyar hill complex and it was studied in a cloud forest-plantation matrix in High Wavys between December 2007 and January 2008, in the post-monsoon season.  Four adults were observed on a plateau at about 1300–1600 m.  The snakes were observed under a rock streamside in a rainforest tract; actively moving about on forest floor on a rainy day;  road-killed in coffee plantation; and under a small cement slab near a building.

The authors imply that cryptic diversity within the Uropeltis ceylanic Group is greater than current systematics would suggest.

Citation
Ganesh SR, Aengals R, and Ramanujam E. 2014. Taxonomic reassessment of two Indian shield snakes in the Uropeltis ceylanicus Group (Reptilia Uropeltidae), Journal of Threatened Taxa 6(1):5305-5314.

Sunday, January 26, 2014

The herpetofauna of Manú National Park, highest species count of any known localilty

Atelopus erythropus, Photo credit A. Catenazzi
Alessandro Catenazzi, Edgar Lehr, and Rudolf von May (2014) have compile a list of all amphibians and reptiles known to occur within Manú National Park, Peru as well as its buffer zone. The park is located in one of the world’s biodiversity hotspots. Covering approximately 0.01% of the planet’s terrestrial surface, this protected area holds 155 species of amphibians and 132 species of reptiles, corresponding to 2.2% and 1.5% respectively of the known diversity for these groups. Manú National Park also preserves natural habitats and populations of the critically endangered (Atelopus erythropus), three endangered (Bryophryne cophites, Pristimantis cosnipatae and Psychrophrynella usurpator), three vulnerable amphibians (Atelopus tricolor, Gastrotheca excubitor, Rhinella manu); and two vulnerable reptiles (Chelonoidis denticulata, Podocnemis unifilis), according to the threat categories of the IUCN Red List.

Unfortunately the authors report, the montane amphibian fauna within the park and the adjacent Kosñipata valley have recently experienced dramatic declines and local extinctions. The collapse of amphibian diversity and abundance has been more pronounced at mid-elevations (1200-2000 m) and for stream-breeding species. These declines occurred over less than a decade and coincided with the arrival of the pathogenic fungus Batrachochytrium dendrobatidis (Bd) to southern Peru. The sudden disappearance of a sizable proportion of the montane anuran fauna despite the excellent state of conservation of the forest and protection granted by Manú  NP shows that additional conservation actions are needed to preserve amphibian biodiversity.

Squamates and anurans constitute the bulk of  reptile and amphibian diversity. Given the wide elevational gradient and large area of montane and high-elevation habitats protected by Manú National Park, the greater relative richness of anurans vs. squamates is probably replicated across several watersheds (and not just the Kosñipata watershed), adds to the species richness.

In an interview with National Geographic, von May said, "Manú now stands as the park or protected area with the highest number of species of amphibians and reptiles on the planet." Follow the link to see more photos of the herpetofauna of Manú.

Prior to this  study, Yasuní National Park in Ecuador was first, with 150 amphibian and 121 reptile species. Both Manú and Yasuní protect large areas of lowland rain forest, but Manú also spans high-elevation cloud forests and Andean grasslands.

The report is available on-line in both Spanish and English.

Citation
Catenazzi, A., Lehr, E. & von May, R. The amphibians and reptiles of Manu National Park and its buffer zone, Amazon basin and eastern slopes of the Andes, Peru. Biota Neotropica. 13(4): http://www.biotaneotropica.
org.br/v13n4/en/abstract?inventory+bn02813042013 ISSN 1676-0603


Friday, January 24, 2014

More Rattlesnake Round-up Perspective

BloombergBusinessweek is carrying the following story regarding the Sweetwater Rattlesnake Round-up.

By David Mildenberg January 23, 2014
In a West Texas prairie of cactus and mesquite, Riley Sawyers sprays gasoline fumes into a narrow crevice in the ground, hoping to drive slumbering rattlesnakes to the surface. His equipment isn’t fancy, just a common pesticide canister attached to a long, thin copper tube. The smell of gasoline fills the air, but no snakes emerge on a 45-degree January day, disappointing Sawyers, a ponytailed tile mason who rounds up snakes on the side. Sawyers says that on a good day he’s captured as many as 56, grabbing them with 4-foot tongs as they emerge for air. It’s a sport revered in rural Texas—especially in Sweetwater, 200 miles west of Dallas, where every March thousands of snakes that hunters capture in the first three months of the year are brought to the Rattlesnake Round-Up to be slaughtered and sold for meat, leather, and venom vaccines. Sawyers’s snake-wrangling skills have made him something of a celebrity in Sweetwater and got him a recurring part on the Animal Planet reality show Rattlesnake Republic, where teams of Texans compete to round up the vipers.
Photograph by Albert Cesare/Odessa American/AP Photo

The hunt may soon become a lot more challenging. Texas environmental officials want to join 29 states that have already banned the use of noxious substances to collect or harass nongame wildlife, citing evidence that gassing, as it’s called, endangers at least 26 animals and insect species sharing underground caverns with snakes. “The research shows quite a compelling case for biological concern,” says John Davis, director of Texas’s wildlife diversity program. “We’re trying to do everything we can to keep species healthy.”

Standing up for endangered species is unusual in Texas, where politicians have campaigned to stop federal efforts to protect the sand dune lizard, the lesser prairie chicken, and other animals whose habitats got in the way of oil and gas drilling. When he ran for the Republican presidential nomination in 2012, Governor Rick Perry recommended reforming the Endangered Species Act to help boost U.S. energy production. It’s not clear whether the proposed gassing ban has his support. The governor expects environmental officials “to take all facts into consideration before making their decision” on whether to ban the practice in March, says Perry spokeswoman Lucy Nashed.

“There’s no studies in this part of the country showing that we are damaging anything,” says Dennis Cumbie, a U.S. Department of Agriculture employee in Sweetwater who has organized opposition to the state’s plan. “The tree huggers or environmentalists—whatever you call them—think we’re hurting stuff. They are out to get us.” Davis counters that decades of research in Texas and states around the country have firmly established the toxic effects of gas vapors on snakes and other species.

More than 150 people packed into a Jan. 17 public forum in Sweetwater, where for two and a half hours citizens and representatives of the local Chamber of Commerce angrily made the case against the proposal. In Sweetwater, captured snakes provide cash and peace of mind. Hunters brought more than 1,000 vipers weighing up to 5 pounds to last year’s Rattlesnake Round-Up, where the festival’s sponsor, the Junior Chamber of Commerce, bought 2,160 pounds of live snakes at $13 a pound. Some snakes were kept alive and sold to dealers. Most were killed—a pneumatic hammer blow between the eyes, then the head chopped off—and eaten by festival-goers, who consumed about 1,000 pounds of fried rattler. “Everyone is excited when the roundup comes around, because it helps solve our problems,” says Jim Wilks, a Sweetwater lawyer and rancher who, like many others in the area, has lost cattle to snakebites. Each year a friend captures as many as 20 rattlesnakes on Wilks’s ranch to sell at the festival, he says.

A gassing ban would cut the number of rattlesnakes captured by as much as 80 percent, leading to a population explosion, says Sawyers, who plans to hunt for snakes almost every day in the weeks before the festival. “It’s not a rare occasion for people in West Texas to come across a rattlesnake in their backyard or crossing a street,” says Sweetwater Mayor Greg Wortham, who opposes a ban. “When someone’s 8-year-old daughter walks across the patio and has to step over a rattlesnake, that’s pretty serious.”



Thursday, January 23, 2014

For Second Year in Row, Tens of Thousands Ask Last Remaining Georgia “Rattlesnake Roundup” to Switch to Humane Wildlife Festival

Photo credit D. Bruce Means
A press release from the CBD.
ATLANTA— As the town of Whigham, Ga., prepares to host its annual “rattlesnake roundup” this weekend, the Center for Biological Diversity and its allies presented a petition with more than 50,000 signatures to the Whigham Community Club today asking that the state’s last roundup transition to a wildlife-friendly festival where no snakes are killed. The petition marks the second year in a row that tens of thousands of people have asked organizers to end the cruel and lethal contest, in which hunters compete for prizes by capturing rare eastern diamondback rattlesnakes. The snakes are displayed and then sold for their meat and skins.

All the state’s other roundups have abandoned the outdated practice of removing rare rattlers from the wild. Two years ago Claxton, Ga., replaced its roundup with the Claxton Rattlesnake and Wildlife Festival, featuring displays of captive rattlesnakes, along with many other educational wildlife exhibits. The new wildlife festival in Claxton received a boost in attendance and high praise from environmental groups, the Georgia Department of Natural Resources, biologists and others who have lobbied for years to end rattlesnake roundups.

“People are fascinated by the rare rattlers, and so am I,” said Collette Adkins Giese, a biologist and attorney at the Center who works to protect rare reptiles and amphibians. “I understand that folks attending the Whigham event want to see snakes, but it’s time to end this cruel hunting contest. Whigham could display captive snakes instead of getting hunters to catch imperiled wild snakes and sell them for slaughter.”

Lethal roundups are still held in at least four states: Georgia, Texas, Oklahoma and Alabama.

Once-common rattlesnakes are being pushed toward extinction not only by hunting pressure but also by habitat loss and road mortality. Analysis of data from four roundups in the southeastern United States shows a steady decline in the weights of prizewinning eastern diamondbacks and the number collected.

In 2011 the Center — along with allies and Dr. Bruce Means, an expert on the eastern diamondback rattlesnake — filed a petition to protect eastern diamondbacks under the Endangered Species Act. Last year the U.S. Fish and Wildlife Service found that the imperiled rattlers may deserve a place on the list of protected species and initiated a full status review.

“Thousands of people have asked the organizers of the Whigham roundup to stop killing snakes, but so far they’ve ignored us,” said Olivia Ries, the elementary-school-aged co founder of a Georgia-based environmental group called One More Generation. “They refuse to even meet with us to discuss how the Whigham event could go forward without harming animals.”

Background
The eastern diamondback is the largest rattlesnake in the world. Adults are typically 4 to 5 feet long and weigh 4 to 5 pounds, but a big snake can reach 6 feet in length and weigh 12 pounds or more. Scientific studies over the past decade have documented range-wide population declines and significant range contractions for the eastern diamondback.

People fear rattlesnakes, but in reality eastern diamondbacks pose a very small public-safety risk. The snakes are certainly venomous, but more people are killed every year by lightning strikes and bee stings. In fact the majority of snake bites occur when humans try to handle or kill snakes — so rattlesnake roundups actually endanger public health by encouraging the public to do just that. Still, malicious killings by those who perceive the snakes as a threat are contributing to the animals’ decline.

Salamanders & Forest Health

This red-legged salamander can help scientists predict forest 
habitat quality and will guide forest management decisions. 
Photo Credit: Grant Connette at Wayah Bald, NC.
Woodland salamanders are small, lungless amphibians that live in moist, forest habitats throughout the U.S. and the world. Salamanders often serve as vital links in forest food chains; their population size and recovery from major disturbances can help predict the health of forest ecosystems. Now, researchers at the University of Missouri have determined that salamander population size reflects forest habitat quality and can predict how ecosystems recover from forest logging activity. MU researchers believe these findings can be translated to other species within forest ecosystems throughout the world.

"One of our primary interests is in conservation of amphibians and the habitats that they utilize," said Ray Semlitsch, Curators' Professor of biological sciences in the College of Arts and Science at MU. "We are trying to understand how land use, and particularly forest management, affects the survival of amphibians on the landscape. We also determined that salamander recovery -- or the amount of time it takes for salamanders to repopulate a cut forest area -- can help forest managers determine appropriate logging schedules."

Semlitsch and fellow researcher, Grant Connette, a graduate student in the Division of Biological Sciences, chose to study a forest area in the southern Appalachian Mountains that has the highest diversity of salamanders in the world. Although seldom seen in the daytime, these animals breathe using their wet skin and forage at night. The researchers conducted surveys of terrestrial salamanders, which don't rely on water or streams, to examine patterns of their abundance relative to timber harvest and species movement behavior. They discovered that forests logged more than 100 years ago may still be affecting salamanders today.

"Most conservation biologists study the pattern of change within a species -- for example, how they decline or how they recolonize after a major event," Semlitsch said. "Our lab takes it a step further by seeking to understand the causes of species decline. We're finding that population fluctuations depend on the animal's behavior, like their ability to disperse, following a major event like logging a forest and can last for many years."

Roughly half of all forest area in the United States is on public land, where modern forest management increasingly uses alternatives to clear-cutting. These techniques include limiting the size of logged areas and maintaining large areas of forest at highly mature stages, which may prove less disruptive to wildlife than clear-cutting. Semlitsch hopes to help find the balance between the economics of using natural resources and conservation and hopes to share this information with forest managers so they can make informed decisions about conservation and biodiversity.

Their research, "Life history as a predictor of salamander recovery rate from timber harvest in southern Appalachian forests, U.S.A." was published in Conservation Biology.

Citation
GRANT M. CONNETTE, RAYMOND D. SEMLITSCH. Life History as a predictor of salamander recovery rate from timber harvest in southern Appalachian forests, U.S.A. Conservation Biology, 2013; 27 (6): 1399 DOI: 10.1111/cobi.12113

Wednesday, January 22, 2014

A new arrangement for African plated lizards and two new genera

The lizard families Gerrhosauridae and Cordylidae form the clade Cordyliformes. But, there is  a long history of disagreement as to whether this clade comprises a single family, Cordylidae or two families: Cordylidae and Gerrhosauridae, or one family with two subfamilies (Cordylinae and Gerrhosaurinae).

In a recently published study in Zootaxa, Bates et al. (2013)  constructed a molecular phylogeny of the African plated lizard family Gerrhosauridae using two mitochondrial markers (ND2, 732 bp; 16S, 576 bp) and one nuclear marker (PRLR, 538 bp). The study showed that the subfamily Gerrhosaurinae consists of five major clades which the authors interpret as representing five genera. The genera Tetradactylus and Cordylosaurus were each recovered as monophyletic, but Gerrhosaurus as currently conceived is paraphyletic, consisting of three distinct genus-level assemblages. The two clades consisting of Gerrhosaurus major Duméril, 1851 and Gerrhosaurus validus Smith, 1849 are both described as new genera:  Broadleysaurus and Matobosaurus. Two subspecies of ‘Gerrhosaurus major’  were historically separated on the basis of differences in color pattern but were found not to be reciprocally monophyletic, so the authors placed Gerrhosaurus bottegoi Del Prato, 1895 in the synonymy of Broadleysaurus major (Duméril, 1851) is rendered monotypic. Gerrhosaurus validus maltzahni De Grys, 1938 is genetically and morphologically well differentiated from G. v. validus and the two taxa also occur in allopatry. The authors  therefore re-instate the former as Matobosaurus maltzahni (De Grys, 1938), resulting in Matobosaurus validus (Smith, 1849) being monotypic species. The authors also showed Gerrhosaurus comprises two major subclades, one consisting of Gerrhosaurus typicus + Gerrhosaurus skoogi and the other containing the remaining species. In this latter subclade the west-Central African.

Gerrhosaurus nigrolineatus is most closely related to Gerrhosaurus auritus rather than to G. nigrolineatus from East and Southern Africa. The west-Central African clade of G. nigrolineatus differs from the East and Southern African clade by a p-distance of 13.0% (ND2) and 6.9% (16S), and can be differentiated morphologically. The authors accordingly apply the name Gerrhosaurus intermedius Lönnberg, 1907 comb. nov. to populations from Kenya, Uganda, Rwanda, Tanzania, Malawi, Mozambique, Zimbabwe and South Africa previously identified under the name G. nigrolineatus. Their results also confirms  Gerrhosaurus bulsi Laurent, 1954 is a distinct species and the sister taxon to a clade containing G. nigrolineatus, G. auritus and G. intermedius. The last four taxa form a closely-related ‘G. nigrolineatus species complex’ with a widespread distribution in Africa. Most closely related to this complex of species is Gerrhosaurus flavigularis Wiegmann, 1828 which has an extensive range in East and Southern Africa, and displays genetic substructure which requires further investigation. The status of Gerrhosaurus multilineatus Bocage, 1866, and Angolan populations referred to G. nigrolineatus, remains problematic.

Citation
BATES MF, TOLLEY KA, EDWARDS S, DAVIDS Z. DA SILVA JM & BRANCH WR (2013). A molecular phylogeny of the African plated lizards, genus Gerrhosaurus Wiegmann, 1828 (Squamata: Gerrhosauridae), with the description of two new genera. Zootaxa, 3750(5), 465-493.

A strange snake story from Alaska

The Peninsula Clarion is the daily newspaper of Alaska's Kenai Peninsula.

By DAN BALMER
Peninsula Clarion
While feeding his dogs last Saturday, George Pierce of Kasilof noticed something out of place in his back yard — a garter snake.

The frozen reptile, 1 1/2 feet in length, was coiled up uncovered by the melting snow. Pierce, who has lived in Alaska for more than 25 years, said he would never expect to find a snake this far north.

“It’s an odd thing to find here especially this time of year,” he said. “Like it fell out of the sky. Not something you see everyday.”

As for the cause of death of the snake, while the above average temperatures this month might have been warm enough for the snake to survive outside, Pierce said the nick on the end of its tail suggests he may have run it over with his snow blower.

He said he could only speculate to how the slithering reptile retired in his yard.

Pierce said he lives a block away from Tustemena Elementary School on the Sterling Highway. Perhaps it is an escapee from a classroom show and tell or maybe the snake arrived here through transport from the Lower 48, he said.

Tustemena Elementary School Principal Doug Hayman said nobody has reported any missing pet snakes.

Alaska Fish and Game wildlife biologist Jeff Selinger said snakes in Southcentral Alaska are not as far-fetched as one would think. The common garter snake is the only species of snake found in Alaska and can be found as far up as Northern Canada, he said.

Selinger said no snakes have been recorded living in the wild in the Kenai Peninsula, but that does not mean people cannot have them as an indoor pet. Some pet stores sell garter snakes, he said.

Another possibility that the snake arrived in Alaska via cargo ship, he said.

“(Garter snakes) live off insects and frogs,” he said. “It is not out of the question one could survive here, but our harsh climate makes it difficult in the winter.”

After 21 years, Our Best Friends pet store on Kalifornsky Beach Road went out of business last March. Selinger said the store did sell reptile pets. The Petco in Soldotna, which opened October 2012, is the only pet store in the central peninsula.

Petco employee Brittney Bickle said the Soldotna store does not have any garter snakes in stock, but said she is aware of one customer who keeps one as a pet and feeds them fish. Bickle recommends anyone interested in adopting a garter snake to inquire in the summertime.

Pierce may not know where the snake came from, but has learned to never rule anything out when living in Alaska.

Catalina Rattlesnakes


The Southern Pacific rattlesnake on Catalina has a tendency
to strike before rattling. Conservancy file photo.
By Jerry Roberts
AVALON, CATALINA ISLAND - Researchers could announce as early as this winter that the Catalina Island version of the Southern Pacific rattlesnake has enough differences from the mainland version of the serpent to declare it a separate subspecies.

"We're on the verge of perhaps doing that, but just can't at this point," says William K. Hayes, Ph.D., of the Department of Earth and Biological Sciences at Loma Linda University. "We're waiting for Carl Person to finish his dissertation, and he's still doing DNA testing."

Hayes and Person presented their findings so far under the title "Santa Catalina's Overlooked Rattlesnake: Ecology, Venom Composition, Historical Origin, and Unanswered Questions" at the Catalina Island Conservancy symposium last year.

Hayes, Person and colleagues Eric C. K. Gren and Wayne Kelln have noticed that the Catalina rattlesnake is distinguished from the mainland version of Southern Pacific rattler by its tendency to strike without warning. Most rattlers do rattle when disturbed, virtually warning potential victims of a pending assault by fangs. The Catalina version goes right for the chomp.

"Catalina individuals are also less likely to rattle when threatened, but are more inclined to bite when defending themselves," the Loma Linda report states.

The Catalina population lacks neurotoxicity, according to the report, which occurs among some but not all mainland populations. Neurotoxicity is damage to the brain and nervous system from toxic chemicals, which are present in some snake poisons.

The analysis also suggests that the Catalina rattlesnakes came to the Island by chance, across a huge barrier of water probably riding debris. They began from a very small founding population, probably resulting from a 'sweepstakes' dispersal over water, since Catalina has never been connected to the mainland, the scientists say. Unlike the other Channel Islands, which broke from the California coast over many millennia, Catalina rose from the ocean floor.

Further analysis suggests that this isolated Island rattler population represents a relict or surviving population of the "original" Southern Pacific rattlesnake, known to science as Crotalus oreganus helleri. Catalina's rattlesnake possibly arrived, according to the report, during the Pliocene Epoch or between 5.3 and 2.5 million years ago.

"Catalina specimens exhibit some morphological differences from the mainland population in blotch pattern and scalation," the report states. The blotches refer to the brownish-black dark markings down the snake's back, separated by lighter-colored bordering. Scalation refers to the arrangement - size, direction, number - of scales on a reptile (or fish). Hayes said that the Catalina snake differs so much physically from the mainland version that these morphological differences on their own are almost enough to declare the Island version a separate subspecies.

Hayes and Person said that many questions remain to be answered about the Catalina population, including:
Without congeneric competitors, does the Island population experience ecological release, occupying more habitats and taking a broader range of prey than the mainland population?
Do temperature differences from the mainland result in different periods of activity that influence frequency of encounters with humans? "Does the maritime environment, which is usually cooler and foggier, influence the snake in significant ways?" Hays said.

Can variation in the venom be linked to preferred prey or prey diversity?
Hays suggested that the "common garden experiment" would be of value - feed the Catalina snakes the same as the mainland Southern Pacific individuals and see what similarities and differences result.
"Our highest priority, however," Hays said, "will be to use this population to study incipient speciation. We can sequence various parts of the nuclear genome, with emphasis on SINEs, LINEs, and methylation patterns, and compare these with their mainland counterparts."

In genetic research, SINES refers to Short Interspersed Nuclear Element Sequence and LINES are Long Interspersed Nuclear Element Sequences. Both sequences in DNA research help delineate species differences and instances of sameness.

The Southern Pacific rattler, like all rattlesnakes, is in the family of pit vipers or Crotalinae. It is Catalina's only venomous snake.

An evo-devo look at limb develpment

The expression of fish Hox genes in a mouse embryo.
Photo Credit: Denis Duboule, UNIGE.
The transition from water to land is one of the most fascinating enigmas of evolution. Especially since both fish terrestrial animals have groups of architects genes, Hoxa and Hoxd , necessary for the formation of fins, as well as that of members during embryonic development. Editor Denis Duboule, a professor at the University of Geneva and EPFL, a team of scientists studied the parallel structure and behavior of these genes in the mouse embryo and in the zebrafish. In both species, the researchers found a similar three-dimensional organization of DNA genes architects observed. They have concluded that the main mechanism used to shape members of tetrapods was already in fish. They then inserted genes architects Hox fish in transgenic mouse embryos and saw that they were active only in the arms of the mice, but not in his fingers, showing that the DNA of fish does not have the elements Genetic essential to the formation of the fingers. Published in the journal PLoS Biology , these results highlight the fact that the digital part of the members of terrestrial animals is the result of a development from a pre-existing infrastructure ancestral DNA, although this represents an evolutionary novelty in tetrapods.

During embryonic development animal genes Hox or "architect genes" are responsible for the organization of the structures of the body. Fish and mammals have groups of genes Hoxa and Hoxd , both of which are necessary for the formation of fins and limbs. The team of Denis Duboule, a professor at the University of Geneva (University of Geneva) and the Ecole Polytechnique Fédérale de Lausanne (EPFL), has recently shown that during development of mammals, Hoxd genes depend on structure "bimodal" three-dimensional DNA to direct the development of members. This genetic structure provides a subdivision of the member in an arm and a hand. Fish them at the fins, do not show this subdivision. ancestral control strategy ... "To determine the genetic origin of this subdivision in arm and leg during evolution, we compared the genetic processes at work during the development of fins and limbs, in embryos of zebrafish and mouse, "says first author of the study, Joost Woltering, researcher at the Department of Genetics and Evolution, Faculty of Science the University of Geneva.

Scientists were surprised to find a three-dimensional bimodal architecture similar DNA in the region of Hoxd genes in fish. These results indicate that the regulatory mechanism used to train members of tetrapods is probably predates the divergence between fish and tetrapods. "We expected the contrary that it is precisely this bimodal DNA conformation that makes all the difference in the production of members, compared to the fins," says Joost Woltering. ... that just needs to be modernized fingers would they therefore homologous rays, these bony structures located at the end of the fish fins? To answer this question, geneticists have inserted into mouse embryos genomic regions that regulate gene expression Hox in fish fins. "Surprisingly, the regulatory regions of the fish triggered gene expression Hox mainly in the arm, not in the fingers, explains Duboule.

Overall, this suggests that, during the transition between fins and limbs, the appearance of our fingers resulting from the modernization of an existing control mechanism. " "What probably happened is comparable to a renewal process, as is done in engineering structures to equip machines with obsolete technologies. In this case, it is a DNA primitive architecture which has a new "technology" to make fingers and toes, "says Joost Woltering. The fin rays are not homologous fingers

The researchers conclude that although the fish have a tool kit gene regulation Hox to produce fingers, this potential is not used as it is in tetrapods. Therefore, they believe that the fin rays are not homologous fingers tetrapods, although they depend in part on a shared control strategy. Geneticists now intend to find out exactly what has changed between DNA elements in fish and tetrapods. "Now we know a lot of genetic switches in mice, which direct the expression of genes Hox fingers. It is important to find out exactly how these processes work today to understand what showed fingers and promoted the colonization of land, "says Denis Duboule. For if our first terrestrial ancestor fours came out of the sea there are some 350 million years, it is sufficient to observe a lungfish, our closest living relative among fish, crawling on all four fins pointed to imagine likely the first stages of evolution on land.

Citation
Joost M. Woltering, Daan Noordermeer, Marion Leleu, Denis Duboule. Conservation and Divergence of Regulatory Strategies at Hox Loci and the Origin of Tetrapod Digits. PLoS Biology, 2014; 12 (1): e1001773 DOI: 10.1371/journal.pbio.1001773