Tuesday, May 23, 2017

triassic fish

Graduate student, Sarah Gibson, has recently been published in PLoS with her article titled "Redescription and Phylogenetic Placement of †Hemicalypterus weir Schaeffer, 1967 (Actinopterygii, Neopterygii) from the Triassic Chinle Formation, Southwestern United States: New Insights into Morphology, Ecological Niche, and Phylogeny." In the article, Sarah reveals some of the latest insights she's discovered into the life and evolution of the Hemicalypterus, including that it evolved herbivory tens of millions of years before other fish did. To read the full article, click here. To gain even further insight, including why fish workers add a cross symbol to the beginning of extinct species names, an interview with Sarah about her PLoS article can be found here

 

Ichthyology
Thursday, July 14, 2016

Chris Beard’s article, “Out of Asia: Anthropoid Origins and the Colonization of Africa,” was recently published in the Annual Review of Anthropology. Previous research has attempted to explain the dispersed geographic distribution of anthropoid primates by hypothesizing tectonic rifts between South America and Africa as the cause, but Beard points out that those predictions conflict with the chronology and the topology of anthropoid evolution. In this article, Beard identifies and discusses biological and geological factors that support the assertion that the cause of dispersal was the crossing of marine barriers by early monkeys on natural rafts. To read the full article, please click here.

Vertebrate Paleontology
Friday, July 8, 2016

horn-fanged spider

Paul Selden, director of the Paleontological Institute, was featured on Live Science in an article by Laura Geggel titled, “99-Million-Year-Old Spider Mummy Sported Horned Fangs.” The article addresses a newly discovered strange and intriguing species of (now extinct) spider, spiders which happened to boast hard plates of armor on their bodies as well as fangs with horns. Selden and his colleagues have settled on the following name for the new species: Electroblemma bifida, which roughly translated from Greek means “amber appearance.” To read more about Selden’s research, click here

Photo by Paul Selden

Paleontological Institute
Wednesday, June 15, 2016

venom fish

Upon hearing the word “venom,” most people probably think of a snake’s fang.

But the ability to produce and inject toxins into another animal is so useful, it has evolved multiple times in creatures ranging from jellyfishes to spiders, shrews to the male platypus.

Now, a paper appearing this week in the journal Integrative and Comparative Biology catalogs instances of venomous aquatic life, for the first time showing that venom has evolved 18 separate times in fresh and saltwater fishes.

Among the paper’s other findings:

venom fish 3In contrast to squamates like lizards and snakes, very few fishes have evolved venomous fangs or teeth
The predominant function for venom in fishes is defense rather than offense
Venom in freshwater is dominated by catfishes, as opposed to marine environments where it is widespread across many groups
It is surprising how comparatively common venom is in deep-sea sharks (30 percent of venomous sharks) compared to deep-sea bony fishes (5 percent of venomous bony fishes)
“For the first time ever, we looked at the evolution of venom across all fishes,” said lead author William Leo Smith, assistant curator at the University of Kansas Biodiversity Institute. “Nobody had attempted to look across all fishes. Nobody had done sharks or included eels. Nobody had looked at them all and included all fishes in an evolutionary tree at the same time.”

Smith and his KU co-authors — undergraduate student Jennifer Stern and Matthew Girard, a graduate student in the Department of Ecology and Evolutionary Biology — along with Matthew Davis of St. Cloud State University, spent years combing medical reports of people exposed to venom from fishes. Then the team assembled the family trees for those fish, using specimens from natural history museums to trace evidence of venom through closely related species.

“We figured out what a venom gland looks like in a known-venomous animal and what it looks like in all related groups,” the KU researcher said. “For instance, relatives of yellowtail that people eat as sushi were reported as venomous, and we were able to find venom glands in their spines.”

According to Smith, the 18 independent evolutions of venom each pose an opportunity for drug makers to derive therapies for a host of human ailments. venom fish 2

“Fish venoms are often super complicated, big molecules that have big impact,” he said. “Venom can have impacts on blood pressure, cause local necrosis, breakdown of tissue and blood, and hemolytic activity — it prevents clotting to spread venom around prey. Venom is a neurotoxin. The average response is incredible pain and swelling.”

According to Smith, because fishes have to live with their own venom, “there might be helper molecules that protect the fishes themselves and help them survive.” He said these also could have therapeutic value to people.

Smith said that up to 95 percent of venomous fish use their toxins defensively, usually gathering venom within their dorsal spines, where it can be deployed in case the fish is crushed or another fish attempts to swallow it.

Some, however, use venom offensively to debilitate their prey and can sometimes injure people.

“Invasive lionfishes will orient themselves in a strange way and ram themselves at people,” Smith said. “One-jawed eels have lost the upper jaw, but with the lower one they slam prey up into a modified fang. Their venom gland sits right above the brain.”

Smith studies biological traits — like the ability to make venom, fly or produce light — that have evolved separately in different lines of species. He said venom is distinct from poison because it typically won’t harm an organism ingesting it; venom works when it comes into contact externally, something Smith himself has experienced when working in the pet trade (where most venom U.S. exposure occurs), cleaning his own fish tank or collecting fishes during fieldwork.

“I’ve never been offensively stung,” Smith said. “The problem is they hide in the rocks in your fish tank, and you move the rocks. Or, when you’re collecting fishes. You’re out there in the water with a mesh bag and a spear, trying to get venomous things, and then a wave hits you and drives the bag of spines into your chest, and you say, ‘Ah I regret that.’” 

By Brendan Lynch

Photo 1: The Venomous Blue Tang (Paracanthurus), who stars in the movie “Finding Dory.”

Photo 2: The Venomous Lipstick Tang (Naso), which is popular in the aquarium trade.

Photo 3: The last thing many fishes see, a head-on view of a Venomous Devil Firefish (Pterois).

All photos courtesy of William Leo Smith

Tuesday, August 30, 2016

songbirdWhile it is widely accepted that songbirds originated from the Australian continent, how and when they diversified and colonized the rest of the globe has remained a mystery.

Researchers from the University of Kansas, Louisiana State University and three other institutions reconstructed the evolutionary history of songbirds using thousands of DNA sequences from majority songbird lineages and information from the fossil record to provide answers to these questions. They found that songbirds began diversifying about 33 million years ago and underwent extensive diversification in Australia. Furthermore, the researchers also found that songbirds first dispersed out of Australia about 23 million years ago through early islands in the Indonesian archipelago into Asia and subsequently the entire globe.

This new research will be published in Nature Communications on Aug. 30.

“One of the challenges with deciphering songbird evolutionary history is that they diversified so rapidly that previous studies had a difficult time estimating the branching pattern of the songbird family tree,” said lead author Rob Moyle, KU professor of ecology and evolutionary biology and curator of ornithology at the KU Biodiversity Institute. “With advances in DNA sequencing technology, we were able to collect an unprecedented amount of DNA sequence data that helped clarify songbird relationships.”

Songbirds comprise the largest group of birds, with about 5,000 species, accounting for nearly half of avian diversity. They are found on almost all corners of the globe, with the exception of Antarctica, and include the familiar crows and sparrows, as well as elaborate singers like mockingbirds and lyrebirds.

With a better understanding of the songbird family tree, Moyle and his colleagues were able to infer the colonization history undertaken by songbird ancestors.

The dispersal of songbirds from Australia through Indonesia, Moyle said, seems like an obvious explanation to anyone who knows world geography; but one has to bear in mind that tens of millions of years ago, world geography looked a lot different because of the Earth’s constant process of plate tectonic movements.  

“Thirty-three million years ago, Australia was thousands of kilometers away from any continent, and New Guinea barely existed,” Moyle said.

Another issue confounding our understanding of songbird evolution is the estimated age of the group, said co-lead author Carl Oliveros, a postdoctoral researcher at Louisiana State University.

“Our estimate for the age of songbirds is about half of most previous estimates, placing songbird evolution in a very different geological landscape than previously thought,” said Oliveros, who earned his doctorate in ecology and evolutionary biology at KU.

“Thus the previous hypothesis of long-distance dispersal by songbirds from Australia to Africa via Indian Ocean landmasses are put into question because these Indian Ocean islands were submerged by the time we think songbirds diversified.”

Oliveros’ and his colleagues’ work also provides an alternative explanation to the high diversity of songbirds that are presently found only in New Guinea. Previous research suggested that songbirds diversified extensively in proto-islands of New Guinea before colonizing adjacent areas.

However, Oliveros and his colleagues believe that songbirds underwent extensive diversification in Australia and subsequently colonized New Guinea after the formation of the New Guinea landmass. They suggest that the aridification of Australia caused the extinction of forest-adapted songbird lineages in the continent, which left relicts of the first colonizers as sole surviving lineages in New Guinea. According to the researchers, this idea is supported by the presence of fossils in Australia of plants and mammals that are currently only found in New Guinea.

The study used tissue samples of birds deposited at the KU Biodiversity Institute collected from expeditions to 25 countries within the past 25 years. This research is supported by funds from the National Science Foundation, KU and Louisiana State. 

By Brendan Lynch

Photo: This yellow-breasted satinbird (Loboparadisea sericea) is among the songbirds research shows first dispersed out of Australia about 23 million years ago through early islands in the Indonesian archipelago into Asia and subsequently the entire globe. Image credit: Brett Benz, American Museum of Natural History 

Ornithology
Friday, September 2, 2016

Michael Engel, senior curator of entomology, was interviewed for the National Science Foundation’s Science360 radio, which features podcasts and radio programs related to NSF funded research. You can listen on your phone via the 360 app, or go to the link below and scroll down slightly to the “Big Picture Science” icon and listen. The interview is about research Michael has authored on how insects construct camouflage out of sand, plant material and even other insects. To find it, search for Michael Engel at Science360

Entomology
Tuesday, September 20, 2016

Monument Rocks

If you stroll the halls of a natural history museum anywhere in the world and come face-to-face with the prehistoric fossil of a pterodactyl or mosasaur, the odds are good it was unearthed in Kansas.

Indeed, American paleontology came of age in the 19th century largely thanks to Kansas’ chalky earth — made famous by the University of Kansas’ “Rock Chalk Chant.” The fine-grained chalk, especially good at preserving fossils, was ocean floor during the Late Cretaceous, from 65 to 100 million years ago, when much of Kansas was beneath the Western Interior Seaway.

“That ocean ran all the way from present-day Gulf of Mexico to northern Canada, through the middle part of this country,” said Bruce Lieberman, senior curator at the KU Natural History Museum, which houses one of the world’s foremost collections of Late Cretaceous fossils. “The water would have been warm and tropical, no deeper than 200 meters at its deepest point.”

The KU researcher said the seaway and its shoreline abounded with ancient marine life such as diving birds, winged and swimming reptiles, fish, clams, and ancient squid relatives called ammonites.

“It’d have been a great place to swim, except there were giant mosasaurs and sharks that would have loved to eat a human,” Lieberman said.

While many fossil treasures from the Western Interior Seaway adorn museums, today many thousands more are stored in the back rooms of various research institutions, inaccessible to most people.

So Lieberman is heading up a project to change that. He’s the primary investigator on a new $2.1 million National Science Foundation grant to digitize Western Interior Seaway collections from eight leading institutions — KU’s Biodiversity Institute, the American Museum of Natural History, the Sternberg Museum of Natural History at Fort Hays State University, the South Dakota School of Mines and Technology, the University of Colorado Museum of Natural History, the University of New Mexico, the Jackson School Museum of Earth History at the University of Texas and the Yale University Peabody Museum of Natural History.  Scientists from the Paleontological Research Institution in Ithaca, New York will also be involved.

“We have all kinds of fossils in these museums, but too many are buried away in drawers and cabinets that make them inaccessible to scientists and the public,” said Lieberman. “We think digitization of these fossils has value for answering scientific questions.”

For instance, a warming climate during the Late Cretaceous is similar to conditions climate scientists expected Earth to undergo in coming centuries. So the comprehensive view offered by digitizing Late Cretaceous fossils could forecast how species may react to altered habitats.  

“We’re going to use computer mapping called ‘ecological niche modeling’ to look at how species were competing with one another — when you pack more species in more tightly, theoretically they’re going to be competing more with each other, which could drive more extinctions,” said Lieberman. “We’d like to see how species adjust their range. Do they partition their range to avoid overlapping as much as possible? This has practical applications because people get food from oceans. We’re predicting as climate gets warmer it’ll cause lots of extinctions. But we’re wondering if we should expect increased competition as well.”

Not only will the digitization work make the Western Interior Seaway fossils more useful to scientists, but the grant will open up access to the fossil treasures for the public at large. 

“We’re going to be creating images and providing information about where fossils come from,” Lieberman said. “The public can look at the same resources as a museum researcher, to expand science out to the public more.”

The public outreach will center on a new “Digital Encyclopedia of Ancient Life” intended as an open-access textbook of paleontology. The atlas will feature an online Cretaceous Atlas with at least 800 species from the Western Interior Seaway to be added to the existing Digital Atlas of Ancient Life for the web and an iPhone app.

In addition to open-access resources, the researchers will develop K-12 curricular materials from the digitization project as well as providing 3-D scans of the fossils and 3-D models for some classrooms. Additionally, exhibitions based on the grant work are planned at the associated institutions. 

Lieberman said the work would involve at least 13 undergraduates and 4 graduate students with the intention of recruiting students from underrepresented groups.

Along with Lieberman, KU Biodiversity Institute faculty working on the grant include Chris Beard and Jim Beach.

Indeed, KU has been at the forefront of digitizing fossils in the 21st century — in the same way that Kansas, thanks to its chalk, was the hotbed of paleontological fieldwork in the 19th century.

“I’ve always thought it was cool that our KU ‘Rock Chalk Chant’ ultimately goes back to rocks in Kansas where some of these awesome fossils were discovered,” said Lieberman. “When people today are chanting ‘Rock Chalk’ they’re probably not thinking of these fossils — but when I hear the chant, I think of fossils.”

By Brendan Lynch

Photo credits: 1—Richard T. Bryant; 2—Laura Mohr of the KU Biodiversity Institute; 3—Jonathan Hendricks of the Paleontological Research Institution

Monday, November 7, 2016

Sarah Gibson in action

Sarah Z. Gibson, graduate student, has received the Albert Wood Student Research award at the 76th Annual Society of Vertebrate Paleontology meeting, held this year in Salt Lake City, Utah. The purpose of this award, named in honor of Dr. Albert E. Wood, is to support student research that involves museum and university vertebrate fossil and/or natural history collections. Recipients of the award conduct collection-based scientific work on some aspect of vertebrate evolution, with special attention given to proposals that greatly enhance the value of fossil material already residing in museum collections. 

Sarah is currently a Doctoral Candidate at the University of Kansas, under the guidance of Dr. Hans-Peter Schultze. Sarah studies the evolutionary relationships of ray-finned fishes from the Triassic of North America. Sarah will use the award to visit the fossil collections of the Academy of Natural Sciences in Philadelphia, Pennsylvania, where she will examine the extensive collection of fossil fishes from the Triassic and Jurassic of New England.

Ichthyology
Monday, November 7, 2016

Leonard Krishtalka, the Biodiversity Institute director, has been elected as a Vice Chair of the Governing Board of the Global Biodiversity Information Facility (GBIF) at its annual meeting in Brazil in October. GBIF is an intergovernmental body headquartered in Copenhagen that provides free and open access to the data on the animals and plants of the planet for science and society. Krishtalka was also re-elected to the Board of Trustees of the JRS Biodiversity Foundation, which funds research on African biodiversity and its conservation, particularly pollinators and freshwater animals and plants.

Wednesday, January 11, 2017

field site in TurkeyA $100,000 grant from the David B. Jones Foundation will help to develop a new generation of paleontologists at the University of Kansas, enabling students to pursue fieldwork in locations such as Wyoming and Turkey aimed at solving some of evolution’s deepest mysteries.

“This money can be used flexibly and broadly to support research training and educational outreach relating mainly to graduate and some undergraduate students at KU in vertebrate paleontology,” said K. Christopher Beard, Distinguished Foundation Professor, Department of Ecology & Evolutionary Biology and senior curator at the KU Biodiversity Institute, who is heading up work under the new grant.

Beard’s research focuses on the early evolution of mammals, including primates. He said the first three David B. Jones Fellows in Vertebrate Paleontology — Matt Jones, Spencer Mattingly and Ryan Ridder — would begin training this spring.

“It’s often hard to get federal funding to support participation by graduate and undergraduate researchers, especially in my kind of research, which is field-based,” Beard said. “Costs can escalate, especially with international fieldwork, airfare and procurements beyond lodging and food — it really can skyrocket. But in paleontology, one of the most important components is to get students access to work in the field.”

The researcher said that student work and training would center on two locations: Wyoming and the nation of Turkey.

In Turkey, Beard’s students will have the opportunity to piece together the ancient migration of mammals in the geographically unique Pontide region, which researchers believe 45 million years ago was an island treasure house of biodiversity, something like today’s Madagascar.

“We’re trying to determine if the Pontide terrain played a role in how animals were able to move back and forth between Asia and Africa, close to the appearance of anthropoid primates,” Beard said. “The more fossils we collected there, the weirder they got. This Pontide island had a unique fauna never found anywhere else but a couple of animals that clearly came from Africa. The most common mammals we’ve found there are primitive hoofed mammals, clearly related to animals common in western Europe, but millions of years earlier — and we’ve got a bat that seems related to Asia.”

In terms of migration of these animals, Beard sees the ancient Pontide region less as a stepping stone between Asia and Africa and more of a “cul-de-sac.”

“Animals were getting to the islands, but not leaving so much — they seemed to get stuck there,” he said.

Before undertaking fieldwork in Turkey, the David B. Jones Fellows will travel to Wyoming to conduct research to establish how mammals during the late Paleocene responded to a warming climate.  

“We’re using Wyoming fieldwork as a proving ground to give students experience in somewhat exotic but not crazy-exotic setting before we take them internationally,” Beard said. “In the southwestern part of the state, we’re establishing a record of how mammals evolved in response to climatic change in the Paleocene, right after the dinosaurs have died and mammals are beginning to evolve rapidly, and comparing that to other findings from the Bighorn Basin.”

Beard said his students would be surveying for fossils, excavating sites and screen-washing sediment for minuscule fossils, as well as partnering with geologists to learn to read the landscape.

“They’ll pick up how to interpret sedimentary rocks, to understand what the ancient environment would have been,” he said. “Are you looking at ancient marsh, lake, seashore or river floodplain? Those are basic skills associated with areas like sedimentology and stratigraphy.”

In addition to work in the field domestically and internationally, the David B. Jones Fellows studying with Beard will be trained in the full “assembly line” of paleontological research, including restoration of fossils, and learning how to mold and cast fossil specimens. The training will be carried out under guidance from David Burnham, preparator at KU’s Natural History Museum. Further, with KU’s Oscar Sanisidro, the fellows will learn techniques of scientific illustration.

field siteA key goal of the grant is facilitation of student publishing of findings in peer-reviewed journals. 

“We want to stimulate scholarly research on part of the graduate students,” Beard said. “KU paleontology already has a great reputation, but we want to push it to the top of the mountain nationally, and one way is to have graduate students publishing scholarly work and giving presentations at conferences. In this grant, there’s funding to support that as well.”

Additionally, the grant provides funds for KU paleontology students to receive training in pedagogy.

“It’s something I faced as a graduate student,” Beard said. “I wound up learning a lot about research, but nobody taught me anything about how to teach. Skills in basic pedagogy are too often lacking in an overall graduate curriculum.”

Finally, the students will develop and lead outreach programs and events at KU’s Natural History Museum to engage the public and young people. Public outreach is a key goal of the David B. Jones Foundation, with its mission to further “educational, research and charitable activities working in the science of paleontology who primarily promote those activities within the United States of America.”

“David B. Jones was an amateur paleontologist who was involved in using fossils to get kids interested in science in general,” Beard said. “For instance, he was active in the Boy Scouts. I think this lines up so well with the agenda of the foundation.” 

By Brendan Lynch 

Photos by Gregoire Metais

Vertebrate Paleontology