Navigation Links
Caribbean frogs started with a single, ancient voyage on a raft from South America

ibian species threatened with extinction. Hedges and coauthor William Duellman, a professor emeritus of the University of Kansas, were involved in much of the field work. A third co-author of the study is Penn State graduate student Matthew Heinicke, who performed DNA sequencing and analysis.

One prominent theory had proposed that frog species on the large islands of Cuba, Jamaican, Hispaniola, and Puerto Rico had walked there across land bridges that existed when those islands were connected in a geologic arc about 70-to-80-million years ago. A second major theory proposed that they arrived, instead, by rafting across the Caribbean Sea after the giant asteroid impact near Cuba 65-million years ago, which is widely believed to have exterminated the dinosaurs. "Both theories acknowledged that the frog faunas must have arrived by rafting over water to the smaller and younger islands, the Lesser Antilles, because they never were connected by land to South America, but neither theory proposed that all of the Caribbean-island frog species had a single common ancestor," Hedges said. __IMAGE_3

The anatomy of Caribbean frogs previously had led the advocates of both theories to conclude that species in Cuba and other western-Caribbean islands were related to different mainland species than were the species on Puerto Rico and other eastern-Caribbean islands, regardless of how they got there. "Discovering a single origin for all of these species from throughout the Caribbean islands was completely unexpected," Hedges said.

To make their discovery, the researchers sequenced the DNA of nearly 300 species of Caribbean, Central American, and South American frogs and used three mitochondrial genes and two nuclear genes in their study, building trees of relationships among the species and timing the divergences of the species with molecular-clock methods. "Molecular clocks work by counting the number of DNA-sequence mutations separating two spec
'"/>

Source:Penn State


Page: 1 2 3 4

Related biology news :

1. Parts of the Caribbean and Central America are likely to have less summer rain
2. A whole lot of shaking goin on triggers early hatching in red-eyed tree frogs
3. Picky female frogs drive evolution of new species in less than 8,000 years
4. Laos ?a lost world for frogs
5. Rare Chinese frogs communicate by means of ultrasonic sound
6. Crucial site for endangered frogs and birds saved
7. Study shows frogs can play key role in stem cell research
8. Leptin found to control appetite and limb development in frogs
9. Race to halt global amphibian crisis boosted by rediscovery of endangered Colombian frogs
10. Researchers find missing genes of ancient organism
11. Family trees of ancient bacteria reveal evolutionary moves
Post Your Comments:
(Date:3/24/2015)... GARDENS, Fla. , March 24, 2015 /PRNewswire/ ... identity management solutions, today announced that its U.are.U ... clothing accessory retailer Goorin Bros . to ... Crossmatch biometrics-based solution secures access to the POS ... the increased risk of data breaches. ...
(Date:3/23/2015)... --  HOYOS Labs , a leading global authentication infrastructure ... Company will demonstrate multiple biometrics-based technologies under its identity ... on March 23 through 25, 2015, in ... IEEE Biometric Open Protocol Standard; free biometrics-based consumer app, ... system. BOPS was invented by HOYOS Labs and contributed ...
(Date:3/23/2015)... 23, 2015 NXT-ID, Inc. (NASDAQ: NXTD ) ("NXT-ID" ... growing mobile commerce market, announces its biometric payment technology, the ... CNBC television starting March 30 th . ... New York markets. ... excited about our new ad campaign following the recent initial ...
Breaking Biology News(10 mins):Crossmatch Fingerprint Readers Help Retailer Prevent Data Breaches at Point-of-Sale 2HOYOS Labs to Showcase Host of Biometrics Technologies at Connect:ID in Washington, D.C. 2HOYOS Labs to Showcase Host of Biometrics Technologies at Connect:ID in Washington, D.C. 3NXT-ID's Wocket Smart Wallet to Launch New CNBC Regional TV Ad Campaign 2NXT-ID's Wocket Smart Wallet to Launch New CNBC Regional TV Ad Campaign 3
... Research Institute scientists has taken a significant step toward answering ... RNA enzymes that can replicate themselves without the help of ... indefinitely. The work was published on Thursday, January ... edition of the journal Science . In the ...
... Calif., January 9, 2009 -- Researchers at the ... that search algorithms used in digital communications can ... led by Giovanni Paternostro, M.D., Ph.D., was published ... PLoS Computational Biology . Using the stack ...
... unveil a novel "two-stage, approach for developing new energy ... emissions and create a cleaner economy during a policy ... York Ave. N.W. in Washington, D.C. , ... Mellon, the University of Minnesota, The Vermont Law School ...
Cached Biology News:Scripps scientists develop first examples of RNA that replicates itself indefinitely 2Scripps scientists develop first examples of RNA that replicates itself indefinitely 3Scripps scientists develop first examples of RNA that replicates itself indefinitely 4Digital communication technology helps clear path to personalized therapies 2Carnegie Mellon to unveil new sequestration plan 2
(Date:3/25/2015)... (PRWEB) March 25, 2015 An increase ... ingredients in all forms of food nutrients, regulatory changes ... a substantial rise in demand for natural astaxanthin over ... started to ramp up their capacities to satisfy the ... natural and synthetic source astaxanthin (used in nutraceuticals, aqua ...
(Date:3/25/2015)... March 25, 2015 Data from ... Mechanism of Action in Neuromuscular Diseases , ... Cytokinetics, Incorporated (Nasdaq: CYTK) announced the publication of ... troponin activator tirasemtiv in the journal Neurotherapeutics. ... “Evidence of Effect” or hypothesis-generating clinical trial which ...
(Date:3/25/2015)... March 25, 2015 Researchers at ... nanoparticle technology that will enable broader and less ... diseases with a simple breath screen. The Minnesota-based ... U.S. Food and Drug Administration (FDA) approval process ... the innovative Nanoparticle Biomarker Tagging device. , Ancon ...
(Date:3/25/2015)...  The Technology Association of Georgia ... promotion and economic advancement of Georgia,s ... of its Top 40 Innovative Technology Companies in ... group at the 2015 Georgia Technology Summit (GTS) on ... TAG,S Top 40 Awards recognize Georgia ...
Breaking Biology Technology:Global Astaxanthin Market to Reach Value of USD 1.1 billion by 2020, Expects Industry Experts in New Report Available at MarketPublishers.com 2Cytokinetics Announces Publication of Results from Phase II Trial of Tirasemtiv in Patients with Myasthenia Gravis 2Cytokinetics Announces Publication of Results from Phase II Trial of Tirasemtiv in Patients with Myasthenia Gravis 3Cytokinetics Announces Publication of Results from Phase II Trial of Tirasemtiv in Patients with Myasthenia Gravis 4Cytokinetics Announces Publication of Results from Phase II Trial of Tirasemtiv in Patients with Myasthenia Gravis 5Cytokinetics Announces Publication of Results from Phase II Trial of Tirasemtiv in Patients with Myasthenia Gravis 6Ancon Medical Researchers Make Nanotechnology Breakthrough for Disease Screening Technology 2Ancon Medical Researchers Make Nanotechnology Breakthrough for Disease Screening Technology 3Streamline Health, Inc. Named a TAG Top 40 Innovative Technology Company 2Streamline Health, Inc. Named a TAG Top 40 Innovative Technology Company 3Streamline Health, Inc. Named a TAG Top 40 Innovative Technology Company 4
... carbon nanotubes more than doubles the growth rate of ... everything from lifesaving medications to sweeteners to dyes and ... to show that carbon nanotubes boost plant cell division ... . Mariya V. Khodakovskaya and colleagues explain that ...
... Ga., April 4, 2012  MiMedx Group, Inc. (OTCBB: MDXG), ... regenerative biomaterials and bioimplants processed from human amniotic membrane, ... revenue goal for the first quarter of 2012. The ... $3.6 million. The Company also reported ...
... SETAUKET, N.Y., April 4, 2012 Lixte Biotechnology Holdings, ... the United States Patent and Trademark Office for its ... homologs. Dr. John Kovach, founder and president ... certain types of skin lymphomas and many other HDACi ...
Cached Biology Technology:MiMedx Exceeds Revenue Goal for First Quarter of 2012 2Lixte Biotechnology Receives US Patent for Its Proprietary Histone Deacetylase Inhibitor 2Lixte Biotechnology Receives US Patent for Its Proprietary Histone Deacetylase Inhibitor 3
Rat Aortic Endothelial Cells (RAOEC) (>500,000 cells)...
... Model 440 incorporates four channels of sophisticated ... easy-to-use instrument. Each channel consists of a ... lowpass filter, a highpass filter, a line ... control knob sets the amplifier parameters and ...
... licensed, high throughput, water bath thermal cycler capable ... microplates. This equates to 9,216 reactions per run ... arm rapidly transfers a basket of plates between ... that are considerably faster than those of peltier ...
... is a four-channel general purpose laboratory amplifier. It ... sources which may have a large common-mode level ... a high gain/low noise amplifier, an input coupling ... offset control. A control knob sets the amplifier ...
Biology Products: