Navigation Links
GW researcher reveals how amphibians crossed continents
Date:8/4/2014

movement can explain the majority of patterns in the distribution of extant species of amphibians.

Dr. Pyron also found that dispersal during the Cenozoic Era (66 million years ago to the present), likely across land bridges or short distances across oceans, also contributed to their distribution.

Given their ancient origin, it is unsurprising that the history of amphibians is a mixture of both vicariance and dispersal. But the third and final distribution pattern that Dr. Pyron notes in his study was an unexpected finding.

Past studies have assumed that long-distance over water dispersal was essentially impossible for amphibians due to salt intolerance. However, when Dr. Pyron began completing his analysis, he noticed a number of cases of distribution that could not be explained by old age.

For instance, one group of frogs found in Australia and New Guinea (pelodryadine hylids) that originated around 61 to 52 million years ago is deeply nested within a group of amphibians that exist only in South America. By the time pelodryadines originated, all major continental landmasses occupied their present-day positions, with South America and Australia long separated from Antarctica.

"They're 120 million years too late to have walked to Australia," Dr. Pyron said.

So how could this group of South American amphibians be related to frogs on the other side of the world?

"You wouldn't think that frogs would be able to swim all the way there, but that seems like one of the more likely explanations for how you could have such a young group nested within South America and have it somehow get to this other continent," Dr. Pyron said.

In his study, Dr. Pyron points two other instances of long-distance oceanic dispersal.

"What you have is this mixture of processes. You have vicariance, which over 300 million years has put certain groups in Africa, some in Australia and others in South America," Dr. Pyr
'/>"/>

Contact: Kurtis Hiatt
kkhiatt@gwu.edu
202-994-1849
George Washington University
Source:Eurekalert

Page: 1 2 3

Related biology news :

1. Researchers to track effects of revolutionary new medicines
2. UMD researchers develop tool to better visualize, analyze human genomic data
3. UC Davis memory researcher wins Pentagon grant
4. Gulf oil spill researcher: Bacteria ate some toxins, but worst remain
5. Monash researcher receives Antarctic science award
6. New method provides researchers with efficient tool for tagging proteins
7. Researchers uncover secrets of internal cell fine-tuning
8. Researcher using next-generation sequencing to rapidly identify pathogens
9. GW researcher receives grant to answer the how and why of autism during development
10. University of Houston researcher publishes textbook on tissue engineering
11. Whitehead Institute researchers create naïve pluripotent human embryonic stem cells
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:9/18/2014)... A team of researchers from McGill University and ... form of polyethylene ,microbeads, Canadian Journal of ... likely originate from cosmetics, household cleansers, or industrial ... abrasives. Owing to their small size and buoyancy, ... Microplastics are a global contaminant in the ...
(Date:9/18/2014)... DNA, tiny strands of nucleic acid that contain instructions ... genetic data, our DNA is copied into RNA molecules, ... tasks in our cells. , Several years ago, ... all other known RNAs, this molecule is circular, and ... little has been known about how they are produced. ...
(Date:9/18/2014)... from several disciplines will be celebrated tonight at the ... in improving the health of premature infants and in ... The researchers, whose work was supported by the National ... former Atomic Energy Commission, will be honored at a ... A bipartisan group of Members of Congress will be ...
Breaking Biology News(10 mins):Microplastic pollution discovered in St. Lawrence River sediments 2Scientists find how mysterious 'circular RNA' is formed, claim muscular dystrophy link 23rd annual Golden Goose award ceremony honors 8 researchers; Unusual work had big results 2
... that rising global temperatures accompanied by melting permafrost in ... into the atmosphere. Once released, that methane gas would ... radiation about 20 times more efficiently than does the ... appearing in the Journal of Geophysical Research ...
... that specially synthesized boron compounds are readily accepted in ... a proof of concept that could lead to new ... Oregon chemist Shih-Yuan Liu reported in the Journal ... of boron-nitrogen compounds with electronic and structural similarities to ...
... This release is available in German . ... restoration and maintenance of the Earth,s multi-trillion dollar ecosystems - ... can have a key role in countering climate change and ... of a new climate issues update by The Economics of ...
Cached Biology News:Methane gas likely spewing into the oceans through vents in sea floor 2Methane gas likely spewing into the oceans through vents in sea floor 3Boron-based compounds trick a biomedical protein 2Time to tap climate-change-combating potential of the world's ecosystems 2Time to tap climate-change-combating potential of the world's ecosystems 3Time to tap climate-change-combating potential of the world's ecosystems 4Time to tap climate-change-combating potential of the world's ecosystems 5
(Date:9/19/2014)... 19, 2014  Nektar Therapeutics (NASDAQ: ... characterizing the analgesic profiles of a series of ... agonist molecules. The preclinical research candidates were created ... The analgesic properties of kappa receptor ... 1,2 Kappa opioid receptors are expressed in ...
(Date:9/19/2014)... Dublin ... announced the addition of the  "Micro Market Monitor ... offering.       (Logo: http://photos.prnewswire.com/prnh/20130307/600769) , , ... fastest-growing segments in the chromatography market. The market ... expected to reach $2.0 billion by 2019, at ...
(Date:9/18/2014)... LONDON , Sept. 18, 2014 ... near-patient testing, is performed outside a clinical laboratory. ... hence in administrating appropriate treatments and medication. POCT ... and prevalence of lifestyle diseases such as diabetes, ... and user-friendly. POCT devices are standardized to minimize ...
(Date:9/18/2014)... (PRWEB) September 18, 2014 Texas ... John Sharp, Texas A&M Health Science Center CEO ... Department of Health and Human Services (HHS), State ... a national pandemic influenza vaccine manufacturing facility in ... an anchor for the Texas A&M Biocorridor – ...
Breaking Biology Technology:Nektar Presents Positive Preclinical Data on Oral, Peripherally-Acting Kappa Agonist Molecules at 2014 American Academy of Pain Management Meeting 2Nektar Presents Positive Preclinical Data on Oral, Peripherally-Acting Kappa Agonist Molecules at 2014 American Academy of Pain Management Meeting 3Nektar Presents Positive Preclinical Data on Oral, Peripherally-Acting Kappa Agonist Molecules at 2014 American Academy of Pain Management Meeting 4Nektar Presents Positive Preclinical Data on Oral, Peripherally-Acting Kappa Agonist Molecules at 2014 American Academy of Pain Management Meeting 5Micro Market Monitor : Global Pre-packed Chromatography Columns 2POCT Market in China 2014-2018 2Texas A&M Dedicates National Pandemic Influenza Vaccine Manufacturing Facility, on Track for 2016 Start-Up Phase 2Texas A&M Dedicates National Pandemic Influenza Vaccine Manufacturing Facility, on Track for 2016 Start-Up Phase 3Texas A&M Dedicates National Pandemic Influenza Vaccine Manufacturing Facility, on Track for 2016 Start-Up Phase 4
... ... PharmSource Information Services, Inc. announces the publication of a ... How to Minimize Your Risk." This incisive resource provides guidelines on ... risk for companies doing business throughout the world. "The U.S. Foreign ...
... SAN DIEGO, INDIANAPOLIS and CAMBRIDGE, Mass., July 7 ... Lilly and Company (NYSE: LLY ) and Alkermes, ... New Drug Application (NDA) for exenatide once weekly has been ... (FDA). , , Exenatide once weekly is an investigational ...
... Caraco Pharmaceutical Laboratories, Ltd. (NYSE Amex: ... Sun Pharmaceutical Industries Ltd. (Sun Pharma), immediately following Sun ... Drug Administration (FDA) for its Abbreviated New Drug Application ... tablets are an androgen receptor inhibitor indicated for use ...
Cached Biology Technology:PharmSource Releases White Paper on Role of U.S. Foreign Corrupt Practices Act (FCPA) in the Bio/Pharma Industry 2PharmSource Releases White Paper on Role of U.S. Foreign Corrupt Practices Act (FCPA) in the Bio/Pharma Industry 3New Drug Application for Exenatide Once Weekly Accepted for Review by FDA 2New Drug Application for Exenatide Once Weekly Accepted for Review by FDA 3New Drug Application for Exenatide Once Weekly Accepted for Review by FDA 4New Drug Application for Exenatide Once Weekly Accepted for Review by FDA 5New Drug Application for Exenatide Once Weekly Accepted for Review by FDA 6Caraco Pharmaceutical Laboratories, Ltd. Markets Generic Casodex(R) Tablets 2