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


More Articles
The electric slide dance of DNA knotsThe electric slide dance of DNA knots

Size and age of plants impact their productivity more than climate, study showsSize and age of plants impact their productivity more than climate, study shows

The development of blood-retinal barrier during astrocyte/vascular wall cell interactionThe development of blood-retinal barrier during astrocyte/vascular wall cell interaction

Bacteria manipulate salt to build shelters to hibernateBacteria manipulate salt to build shelters to hibernate

It takes two to courtIt takes two to court

Magnets for fusion energy: A revolutionary manufacturing method developedMagnets for fusion energy: A revolutionary manufacturing method developed

Breakthrough laser experiment reveals liquid-like motion of atoms in an ultra-cold clusterBreakthrough laser experiment reveals liquid-like motion of atoms in an ultra-cold cluster

A crystal wedding in the nanocosmosA crystal wedding in the nanocosmos

Has Antarctic sea ice expansion been overestimated?Has Antarctic sea ice expansion been overestimated?

Enhanced instrument enables high-speed chemical imaging of tissuesEnhanced instrument enables high-speed chemical imaging of tissues

Lunar pits could shelter astronauts, reveal details of how 'man in the moon' formedLunar pits could shelter astronauts, reveal details of how 'man in the moon' formed

New research: When it hurts to think we were made for each otherNew research: When it hurts to think we were made for each other

Law of physics governs airplane evolutionLaw of physics governs airplane evolution

The economic territory of Upper Palaeolithic groups is specified by flintThe economic territory of Upper Palaeolithic groups is specified by flint

Running for life: How speed restricts evolutionary change of the vertebral columnRunning for life: How speed restricts evolutionary change of the vertebral column

Brain waves show learning to read does not end in 4th grade, contrary to popular theory

Getting a grip on robotic graspGetting a grip on robotic grasp

The bend in the Appalachian mountain chain is finally explainedThe bend in the Appalachian mountain chain is finally explained

Cooperation among humans, a question of ageCooperation among humans, a question of age

Protein's 'hands' enable bacteria to establish infection, research findsProtein's 'hands' enable bacteria to establish infection, research finds

Less exercise, not more calories, responsible for expanding waistlinesLess exercise, not more calories, responsible for expanding waistlines

High earners in a stock market game have brain patterns that can predict market bubblesHigh earners in a stock market game have brain patterns that can predict market bubbles

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

Platonic solids generate their 4-dimensional analoguesPlatonic solids generate their 4-dimensional analogues

Study of animal urination could lead to better-engineered productsStudy of animal urination could lead to better-engineered products

Do probiotics help kids with stomach bugs?Do probiotics help kids with stomach bugs?

Strict diet suspends development, doubles lifespan of wormsStrict diet suspends development, doubles lifespan of worms

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
Mixed genes mix up the migrations of hybrid birdsMixed genes mix up the migrations of hybrid birds

Ancient genetic material from caries bacterium obtained for the first timeAncient genetic material from caries bacterium obtained for the first time

Marmoset sequence sheds new light on primate biology and evolutionMarmoset sequence sheds new light on primate biology and evolution

Untangling spider's webs

Oetzi's 'non-human' DNA

Genome-wide analysis reveals genetic similarities among friends

A-maize-ing double life of a genome

Dodos and spotted green pigeons are descendants of an island hopping bird

Organismal biologists needed to interpret new trees of life

Biologists link sexual selection and placenta formationBiologists link sexual selection and placenta formation

Transgender algae reveal evolutionary origin of sexesTransgender algae reveal evolutionary origin of sexes

DNA of 'Evolution Canyon' fruit flies reveals drivers of evolutionary changeDNA of 'Evolution Canyon' fruit flies reveals drivers of evolutionary change

Hair from mummy's clothes provides insights into red deer lineage

Extinct human cousin gave Tibetans advantage at high elevationExtinct human cousin gave Tibetans advantage at high elevation

Genetic study reveals vulnerability of northwest dolphins



Archives
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.