Genetic Archaeology
Recent News |  Archives |  Tags |  About |  Newsletter |  Submit News |  Links |  Subscribe to GeneticArchaeology.com RSS Fee Subscribe


More Articles
Two-dimensional electron liquidsTwo-dimensional electron liquids

Sharks in acidic waters avoid smell of foodSharks in acidic waters avoid smell of food

Neuroscientists decode brain maps to discover how we take aimNeuroscientists decode brain maps to discover how we take aim

What set the Earth's plates in motion?What set the Earth's plates in motion?

'Jaws' lived in Doncaster'Jaws' lived in Doncaster

How bacteria battle fluorideHow bacteria battle fluoride

Researchers create world's largest DNA origamiResearchers create world's largest DNA origami

World population to keep growing this century, hit 11 billion by 2100World population to keep growing this century, hit 11 billion by 2100

Astrophysicists to probe how early universe made chemical elementsAstrophysicists to probe how early universe made chemical elements

The future face of molecular electronicsThe future face of molecular electronics

American-made wind turbine bladesAmerican-made wind turbine blades

Nature's designs inspire research into new light-based technologiesNature's designs inspire research into new light-based technologies

When rulers can't understand the ruledWhen rulers can't understand the ruled

Hey1 and Hey2 ensure inner ear 'hair cells' are made at the right time, in the right placeHey1 and Hey2 ensure inner ear 'hair cells' are made at the right time, in the right place

Researchers find 'most famous wheat gene'Researchers find 'most famous wheat gene'

Elusive quantum transformations found near absolute zeroElusive quantum transformations found near absolute zero

Is a gluten-free diet enough to control the complications of celiac disease?Is a gluten-free diet enough to control the complications of celiac disease?

X-ray imaging paves way for novel solar cell productionX-ray imaging paves way for novel solar cell production

Collaboration drives achievement in protein structure researchCollaboration drives achievement in protein structure research

Childhood mentors have positive impact on career successChildhood mentors have positive impact on career success

Blood-cleansing biospleen device developed for sepsis therapyBlood-cleansing biospleen device developed for sepsis therapy

Missing piece found to help solve concussion puzzleMissing piece found to help solve concussion puzzle

Biologists delay the aging process by 'remote control'Biologists delay the aging process by 'remote control'

Bombarded by explosive waves of information, scientists review new ways to process and analyze Big DataBombarded by explosive waves of information, scientists review new ways to process and analyze Big Data

Program earns kudos for improving grades, retaining studentsProgram earns kudos for improving grades, retaining students

Geography matters: Model predicts how local 'shocks' influence U.S. economyGeography matters: Model predicts how local 'shocks' influence U.S. economy

A healthy lifestyle adds years to lifeA healthy lifestyle adds years to life

Identified for the first time what kind of explosive has been used after the detonationIdentified for the first time what kind of explosive has been used after the detonation

Copied from nature: Detecting software errors via genetic algorithmsCopied from nature: Detecting software errors via genetic algorithms

Amazonian amphibian diversity traced to Andes (3/11/2009)

Tags:
frogs, amphibians, south america, genetic diversity
Poison frog from the transition between the Andes and Amazonia in northeastern Peru. -  Juan Carlos Santos, the University of Texas at Austin
Poison frog from the transition between the Andes and Amazonia in northeastern Peru. - Juan Carlos Santos, the University of Texas at Austin

Colorful poison frogs in the Amazon owe their great diversity to ancestors that leapt into the region from the Andes Mountains several times during the last 10 million years, a new study from The University of Texas at Austin suggests.

This is the first study to show that the Andes have been a major source of diversity for the Amazon basin, one of the largest reservoirs of biological diversity on Earth. The finding runs counter to the idea that Amazonian diversity is the result of evolution only within the tropical forest itself.

"Basically, the Amazon basin is a 'melting pot' for South American frogs," says graduate student Juan Santos, lead author of the study. "Poison frogs there have come from multiple places of origin, notably the Andes Mountains, over many millions of years. We have shown that you cannot understand Amazonian biodiversity by looking only in the basin. Adjacent regions have played a major role."

Santos and Dr. David Cannatella, professor of integrative biology, published their findings this month in the journal PLoS Biology.

It has been assumed that much of the evolution of biodiversity in the Amazon basin occurred over the last one to two million years, a mere snapshot in time.

Santos and Cannatella peered about 45 million years into the past using novel biogeographical techniques to create a deep evolutionary history of poison frogs in space and time. Because of the lack of an extensive fossil record for the tropical forest, their work used DNA sequences to discover the frogs' evolutionary history.

The poison frogs, or dendrobatids, are diverse and widely distributed across the Neotropics, an area that includes Central and South America. The scientists created an evolutionary tree, or phylogeny, using 223 of the 353 species of poison frogs known from throughout this region.

In analyzing the evolutionary relationships among the poison frogs, they discovered that Amazonian diversity is the result of at least 14 dispersals of ancestral frogs into the region beginning about 23 million years ago.

All living Amazonian poison frogs evolved from these ancestors, most of which (11 dispersals) came from the Andes Mountains.

The Amazon basin has changed dramatically over that long time. A large inland system of water has come and gone, the Andes Mountains started their uplift (about 15 million years ago) and the Amazon River was formed (about nine million years ago).

Most of the frog dispersals from the Andes occurred between one and seven million years ago, when the modern tropical rainforest of the Amazon River basin was forming.

"There was a repeated dispersal of frogs from the foothills of the Andes after the extensive inland wetlands retreated from the Amazon," says Santos.

These frogs then evolved into about 70 species found today in the Amazon basin.

The scientists also discovered that frogs have historically immigrated out of the Amazon basin to adjacent areas, and to and from other regions within the Neotropics.

Evolution and diversification of the poison frogs is ongoing, especially in the Amazon rainforest, the Chocó (a narrow region of tropical forest along the northwest Pacific Coast of South America) and in adjacent Central America.

Cannatella says many other tropical plants and animals in the Amazon may share this more complex geographical and temporal history with the poison frogs.

"The Amazon rainforest is not just gradually accumulating diversity over time," says Cannatella. "Ancestral frog species moved into and out of the area, and we can predict that other organisms restricted to these wet tropical forests may show a similar pattern of dispersal, evolution and diversification."

Note: This story has been adapted from a news release issued by the University of Texas at Austin

Post Comments:

Search

New Articles
Slimy fish and the origins of brain developmentSlimy fish and the origins of brain development

Natural born killers: Chimpanzee violence is an evolutionary strategy

Iberian pig genome remains unchanged after 5 centuries

Counting fish teeth reveals regulatory DNA changes behind rapid evolution, adaptationCounting fish teeth reveals regulatory DNA changes behind rapid evolution, adaptation

Human faces are so variable because we evolved to look uniqueHuman faces are so variable because we evolved to look unique

How learning to talk is in the genes

Gibbon genome and the fast karyotype evolution of small apes

Non-dominant hand vital to the evolution of the thumb

Sloths are no slouches when it comes to evolution

Mapping the DNA sequence of Ashkenazi JewsMapping the DNA sequence of Ashkenazi Jews

A single evolutionary road may lead to Rome

Sequencing of 5 African fishes reveals diverse molecular mechanisms underlying evolution

Extinctions during human era worse than thought

Maternal low protein diet promotes diabetic phenotypes in offspring

Non-adaptive evolution in a cicada's gutNon-adaptive evolution in a cicada's gut



Archives
September 2014
August 2014
July 2014
June 2014
May 2014
April 2014
March 2014
February 2014
January 2014
December 2013
November 2013
October 2013
September 2013
August 2013
July 2013
June 2013
May 2013
April 2013
March 2013
February 2013
January 2013
December 2012
November 2012
October 2012
September 2012
August 2012
July 2012
June 2012
May 2012
April 2012
March 2012
February 2012
January 2012
December 2011
November 2011
October 2011
September 2011
August 2011
July 2011
June 2011
May 2011
April 2011
March 2011
February 2011
January 2011
December 2010
November 2010
October 2010
September 2010
August 2010
July 2010
June 2010
May 2010
April 2010
March 2010
February 2010
January 2010
December 2009
November 2009
October 2009
September 2009
August 2009
July 2009
June 2009
May 2009
April 2009
March 2009
February 2009
January 2009
December 2008
November 2008
October 2008
September 2008
August 2008
July 2008
June 2008
May 2008
April 2008
March 2008
February 2008
January 2008
December 2007
November 2007
October 2007
September 2007
August 2007
July 2007
June 2007
May 2007
April 2007
March 2007
February 2007
January 2007
November 2006
October 2006
September 2006
June 2005
October 2004
July 2001


Science Friends
Agricultural Science
Astronomy News
Biology News
Biomimicry Science
Cognitive Research
Chemistry News
Tissue Engineering
Cancer Research
Cybernetics Research
Electonics Research
Forensics Report
Fossil News
Genetics News
Geology News
Microbiology Research
Nanotech News
Parenting News
Physics News


  Archives |  Submit News |  Advertise With Us |  Contact Us |  Links
Use of this site constitutes acceptance of our Terms of Service and Privacy Policy. All contents © 2000 - 2015 Web Doodle, LLC. All rights reserved.