Tuesday, June 14, 2016
Chan Kin Onn

From 30th May to 10th June 2016, the herpetology division held a field herpetology summer class designed to introduce students to the local herpetofauna and methods for conducting field surveys. We led 12 inspired students on a two-week long fieldtrip across six different counties in Kansas and managed to collect 44 different species of amphibians and reptiles. Here are some highlights from our trip:

Our journey began at the Konza Prairie Biological Station (KPBS) where the director of the station Dr. Eva Horne gave us a very informative tour about the research that was going on at the station. The KPBS is located in the Flint Hills on a 3,487 hectare native tallgrass prairie preserve jointly owned by The Nature Conservancy and Kansas State University. This was the students first introduction to herping and what better place to start than The Flint Hills! 

From Konza, we headed to Cheyenne Bottoms wetlands for a day before proceeding to Wilson Lake State Park in the Smokey Hills region of Kansas. Here, students got to try their hands at noosing lizards under the watchful eye of the noose master himself, Rich Glor. 

To cap off the first week of fieldwork, we visited the Sternberg Museum of Natural History and was given a behind-the-scenes tour by the collections manager Curtis Schmidt. 

For the second week, we headed southwards to Alexander Ranch in Barber County, led by  guest instructor Eric Rundquist. This was by far the most productive site where we managed to rack up 26 species in two days. 

Our next stop was Elk City State Park in Montgomery County where the highlight was three Rough Green Snakes! (Opheodrys aestivus). 

Our last stop for the trip was Shermerhorn Park in Cherokee County where we found our first salamanders and newt!

12 fantastic students -- two weeks in the field -- 6 counties -- 44 species, sums up an immensely successful class. Can't wait to do it again next summer!

For more photos, please visit the KU Herpetology flickr page

 

 

 

Monday, June 6, 2016
Rich Glor

KU Herpetology PhD candidate Jesse Grismer  will soon be defending his thesis work on "The Fragmentation of Gondwanaland: Influence on the Historical Biogeography and Morphological Evolution within Dragon Lizards (Squamata: Agamidae)". Jesse's defense is scheduled for June 8th at 1pm in Malott 2049. See you there.

Tuesday, March 22, 2016
A. Townsend Peterson

Doctoral student Lindsay Campbell is in Peru, attending the Latinamerican meeting of the American Society for Tropical Medicine and Hygiene, where she will present a talk on landscape influences on rodent communities in the western Amazon. She will also attend a working meeting of a project team for this work with landscape ecology of rodent-borne diseases in the Amazon, which is funded by the Inter-American Institute.

Thursday, February 18, 2016
Ron Seidel
Andy Bentley removes specimens from a cryogenic dewar.

 

If you think you are cold this winter, remember others always have it worse. For instance, consider the tissue samples at the KU Biodiversity Institute.

The KU Biodiversity Institute stores thousands of tissue samples from species found around the globe at a frosty -175 degrees Celsius. The specimens are stored in dewars, which are large, vacuum-sealed containers with a pool of liquid nitrogen at the bottom. While -175 degrees is hard to imagine, the newest dewar at KU dips even lower.


“The latest one we’ve acquired runs at -190 degrees Celsius, but otherwise functions much in the same way,” said KU Ichthyology Collections Manager Andy Bentley.

 

To put that in perspective, NASA satellites found locations in east Antarctica reaching temperatures of -135.8 degrees Celsius, or -93.2 degrees Fahrenheit, still almost 60 degrees shy of the dewar’s temperatures. These antarctic locations boast the lowest temperatures found naturally on earth to date. Humans are expected to survive only three minutes in these frozen conditions--not nearly enough time to build a snowman.
 
East Antarctica, warmer than a cryogenic dewar.
 
The extreme temperatures in dewars preserve usable DNA in tissue samples taken from whole specimens. The voucher specimens are often stored in structure-preserving formaldehyde solutions. However, formaldehyde destroys a specimen’s DNA, rendering them useless for further genetic study. Researchers need a way to keep both the DNA and the whole specimen preserved.

 

“We need a way to preserve DNA before the specimens are fixed in formaldehyde,” Bentley said. “So now in the field we take fresh specimens and extract samples of either internal organs or muscle tissue, place them in a tube, and freeze them before sending the rest of the specimen to be preserved.”

 

Tissues preserved in the dewars are in constant demand. Researchers from all over the world review online catalogs of stored specimens and send requests for tissues that could further their research. Upon receiving a request, the specimen is carefully extracted from the dewar and thawed on ice. Once thawed, a tiny piece of tissue is sliced from the sample and shipped in ninety-five percent ethanol.

 

The number and variety of specimens available for research is growing rapidly. The two dewars currently used are quickly filling with tissue samples. Bentley expects the newest dewar to see use before 2017.

 

“There’s new material coming in from the field at a rate of ten percent a year,” Bentley said. “In ichthyology we expect another 1,100 tissues a year, so with that kind of growth across all departments we expect to fill the two current dewars in six to eight months.”

 

When the first two dewars near capacity, the third will be filled with eight-to-ten inches of liquid nitrogen. This level is monitored 24 hours a day to maintain the crucially cold temperatures. Once filled, the third dewar stands ready to support the growing collection.

 

“There is a fairly large portion of material that is unique to our collection,” Bentley said. “The ichthyology collection, we think, is probably one of the largest ichthyology tissue collections in the world, based on taxonomic and geographic scope.”

 

 


 

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Tuesday, February 16, 2016
A. Townsend Peterson

Town Peterson is spending 5 weeks at the Wildlife Institute of India, where he is teaching on disease transmission risk mapping and biodiversity informatics. The WII is in Dehrahun, located at the foot of the Himalayas, so the environment is beautiful. Good colleagues working on very diverse questions. 

Friday, January 22, 2016
Josh Schmerge

Tyrannosaurus rex is without a doubt the most famous dinosaur in the world, and one of the lasting questions people have about this amazing dinosaur is what it was like as a teenager before it was full grown. A paper I co-authored with Bruce Rothschild, a former research affiliate with the University of Kansas Biodiversity Institute, now published online in the journal Cretaceous Research addresses this interesting question.

A nearly complete dinosaur skeleton labeled as BMR P2002.4.1, but more affectionately referred to as 'Jane' in honor of the woman who discovered it, has been the center of a decades long dispute over the validity of a dinosaur called Nanotyrannus lancensis. Nanotyrannus was named by a team led by the famous paleontologist Bob Bakker as a 'pygmy tyrannosaur' from the Late Cretaceous of Montana1. Not all dinosaur paleontologists are convinced of this assessment, and many prominent studies have asserted that Nanotyrannus—specifically 'Jane', the original holotype fossil skull at the Cleveland Museum of Natural History, and a handful of other isolated remainsare instead remanants of immature T. rex. In fact, if you visit wikipedia's page for Tyrannosaurus rex, you will find a proudly displayed image of 'Jane' from the Burpee Museum of Natural History. While paleontologists in this debate have focused on the number of teeth in the jaws2, the overall shape and proportion of the skull3, and whether the texture of the bone is more similar to that of adults of immature individuals4, we observed an isolated character on the skeleton of 'Jane' that shed some additional insight on this debate.

A portion of 'Jane's' lower jaw (called the dentary bone) is marked by a deep groove containing numerous small openings. Bruce Rothschild, who is an expert on ancient diseases and has looked at many jaws from theropod dinosaurs, was unaccustomed to seeing such a feature in a tyrannosaur, and thought this groove was possibly a sign of some disease. It turns out that the other specimens of the embattled genus Nanotyrannus also shared this feature, so it likely wasn't evidence of a disease. After examining additional dinosaur fossils, we found out that, in fact, this groove is found on nearly all theropod dinosaurs outside of the tyrannosauroid group (the group more closely related to T. rex than other meat-eaters like Allosaurus, Spinosaurus, and Coelophysis). Among tyrannosaurs, however, we found an opposite trend: only 7 of 18 tyrannosaurs had this feature, and half of those occurences were found in the group of the earliest tyrannosaurs. We further investigated this question by examining known T. rex material, ranging in age from "baby" all the way to full grown adult, and found that none of these fossils showed the groove we found on 'Jane'!

 

Skull of Nanotyrannus ('Jane') with arrow pointing to dentary groove.

 

So what does this mean? It could be that 'Jane' and all the other fossils we call Nanotyrannus really are juvenile T. rex, and they are undergoing a really dramatic bodily transformation during their growth into adults (puberty sure is rough!), but this is unlikely given that none of the undisputed T. rex fossils we investigated have this feature. This groove is a passageway for nerves and blood vessels to move through the bones of the skull, and short of saying that the nerves and veins of the head dramatically changed their placement as the animal grew, if a baby has no groove, a sub-adult has no groove, and a full-grown adult has no groove, one would logically not expect a juvenile to have a groove either. To us (and some of the other scientists arguing in favor of Nanotyrannus), this is evidence that Nanotyrannus is a different dinosaur from T. rex, and they likely preferred different environments and prey even though they lived at the same time.

What does this mean about how Nanotyrannus fits in to the dinosaur family tree? Even though Nanotyrannus has been variously proposed to be a young T. rex or a closely related species, our phylogenetic analysis actually places Nanotyrannus as a close relative of the albertosaurine tyrannosaurs (moderate-sized theropods that lived in what is now Canada). We obtained this result because they are the only group of advanced tyrannosaurs to possesses the groove we studied. This result was interesting, however, because Charles Gilmore, the paleontologist that described the original Nanotyrannus on display at the Cleveland Museum5, thought it was an example of a new species of Gorgosaurus, one of the types of albertosaurines. History seems to have come full circle.

So now what? Well to the fan club of Nanotyrannus, we have some additional evidence that this was in fact a separate dinosaur species. And for now, the hunt is back on for a complete fossil that shows us what the mighty T. rex was like as a teenage terror.

 

References

1. Bakker et al., 1988. Nanotyrannus, a new genus of pygmy tyrannosaur, from the Latest Cretaceous of Montana. Hunteria 1:1-28.

2. Larson, P. 2013. The case for Nanotyrannus. Pp. 14-53 in Parish et al. (eds.), Tyrannosaur Paleobiology. Indiana University Press.

3. Carr, T. 1999. Craniofacial anatomy in Tyrannosauridae (Dinosauria, Coelurosauria). Journal of Vertebrate Paleontology 19:497-520.

4. Currie, P. 2003. Cranial anatomy of tyrannosaurid dinosaurs from the Late Cretaceous of Alberta, Canada. Acta Palaeontologica Polonica 48:191-226.

5. Gilmore, C. 1946. A new carnivorous dinosaur from the Lance Formation of Montana. Smithsonian Miscellaneous Collections 106:1-19.

Wednesday, January 20, 2016
Luke Welton

This past August, I returned to the University of Kansas – and Natural History Museum and Biodiversity Institute – becoming the new Collections Manager in the Division of Herpetology. August couldn’t have made for a better homecoming, as KU was celebrating 100 years of herpetological research by hosting the annual SSAR (Society for the Study of Amphibians and Reptiles) meeting. The meeting offered a perfect opportunity to connect with so many whom have helped build this division into one of the greatest centers for herpetological research in the country, if not the world.

Over these few first, short months I’ve received nothing but support from students and colleagues, making the transition from student to employed researcher nearly seamless. This support has afforded me the flexibility to take on the responsibilities associated with managing a collection of more than 340,000 herpetological natural history specimens, while simultaneously wrapping up dissertation work towards a Ph.D. in Evolutionary Biology.

With the aid of a stellar group of undergraduate volunteers, an incredible curatorial assistant, and a cohort of graduate students that are second to none, we’ve been able to close outstanding loans of material that are years and even decades past due. We’ve also accessioned and incorporated into our collections several thousand specimens of amphibians and reptiles from the Philippines, Kansas (US), and Madagascar.  Over the next few months, we’ll be doing the same for recent collections from the Solomon Islands, Indonesia, Malaysia, and Cameroon. Additional projects on the horizon include continued digitization of specimen photographs, calls, and other ancillary data, and a complete inventory of our tissue and dry collections.

I’m very much looking forward building on the storied history of herpetology at the University of Kansas. From modernizing the use of the collection, to maintaining it’s availability for researchers in the international community, and even contributing to it directly through my own research endeavors, I hope to play an integral roll in the future of herpetology here at KU.

Thursday, January 14, 2016
Xiaomin Zhou

In additon to the diverse ecology, rich cuisine, and wonderful coffee, Costa Rica is admired for its colorful culture. Diverse gifts, from woven hammocks to handmade ceramics, reflect this. On our way back to San Jose we stopped in Sarchi, a town referred to as Costa Rica’s handicrafts capital. Inside one of the local shops was El Galeron de los Pintores, where several local artists hand-paint intricate designs on a variety of art pieces.

Among the art on display were selections of full-size and miniature oxcarts, or carretas, decorated in an array of bright colors.  These recall traditional oxcarts used in Costa Rica during the 19th century. As the demand and production of coffee grew, carretas became the primary means to hauling goods from plantations. In the early 20th century, people began painting the carts with colorful displays. Since everything is done by hand, no two are exactly alike. Nowadays the carts are reserved for special occasions, such as the Oxcart Drivers Day held annually in Escazu.

The carretas, a national symbol, represent a unique aspect of the history of Costa Rica. The people of Costa Rica live to the motto pura vida, meaning pure life, a simple phrase with a profound meaning. The display of bright colors on arts and crafts perfectly captures the country’s vibrant culture and lifestyle. 

Monday, January 11, 2016
Luke Schletzbaum

Today we had a day of fieldwork capped off with an insightful talk discussing ecotourism as a tool for conservation. It was conducted by the general manager of the University of Georgia-Costa Rica, Fabricio Comacho. He presented with passion, as he is heavily involved with sustainable development in his home country of Costa Rica. Fabricio touched upon how ecotourism in Costa Rica is an integral part of the country’s income. He stressed how sustainable attractions impact the very environment tourists come to see. Water stress, for example, was a key issue that Fabricio said became more problematic than other issues in recent times. As development increases in rural regions of Costa Rica, the demand for water stresses many of the fragile ecosystems surrounding large resorts or hotels, and therefore also stresses the organisms trying to survive in those areas. Fabricio also mentioned other important component of sustainable development, including the creation of biological corridors, and the nationwide switch to renewable sources of energy. Costa Rica currently boasts approximately %90 of its energy as strictly renewable and aims to be %100 carbon independent by 2030. Seeing this level of respect for the natural environment in the people I  met in Costa Rica made me realize what is possible when there is a nation-wide effort in maintaining the health of the environment. From the standpoint of an American living in a much larger and carbon-hungry nation, I felt saddened and more aware of the apparent apathy the U.S. as a whole applies to the concept of environmental sustainability.

Friday, January 8, 2016
Tracey Funk

While researching my previous blog A Dry Rainforest? I learned that Costa Rica is having a more extreme dry season than most and is actually experiencing a drought. To the untrained eye (like mine and most tourists) the forest appears fine; the plants are green and the lack of rain is assumed to be due to the dry season. For those familiar with rainforests, however, the signs are everywhere. Plants have fewer new growths than usual, deciduous trees have lost many of their leaves, and there have been many days with no precipitation at all. The cloud forest in Monteverde, normally a place of constant precipitation even in dry seasons, has received no precipitation for the past five days.
The drought has consequences reaching far beyond the rainforest. Hydroelectric dams generate approximately 82% of Costa Rica’s energy. The dropping water levels caused by the drought result in less water pressure to power the dams, reducing their total hydroelectric power. Costa Ricans must compensate by shifting to fossil fuels, hindering their goal to become the world’s first carbon neutral nation by 2021. It is believed that this drought is the result of a severe El Niño – the same weather system bringing floods to southern California – but the effect is exacerbated by recent climate trends. Global climate change has affected the region by increasing the number of completely dry days during the dry season. Since 2011 the area began experiencing over 100 dry days a year. Ironically, Costa Rica’s forced use of more fossil fuels only exacerbates the issue. If they are to achieve carbon neutral status, Costa Ricans (and the entire global population) will need to find a way to avoid regressing towards using fossil fuels.