Navigation Links
New World founders small in number

About 14,000 years ago - a few hundred thousand years after our putative modern forebears spread out from Africa - descendants of archaic humans crossed the Bering land bridge from Siberia to North America. Several lines of evidence support this model, but that's where the consensus ends and the details are hotly debated. In a paper published in the premier open-access journal PLoS Biology, Jody Hey now reveals how the sizes of the first New World populations have changed since they were founded. His new approach shows that the New World was colonized by a surprisingly small population with an effective size of only about 70 individuals (those individuals likely to contribute genes to the next generation).

Hey's approach addresses shortcomings in traditional population genetic studies that rely on just one gene and that assume that population sizes have been constant over time. Studying levels of DNA sequence variation at a single genomic region, or loci, can offer insight into the history of that gene, but the stochastic nature of gene evolution means that different genes have different histories. Hey analyzed DNA sequences from nine loci, so that the population genetic history could be found despite variation among genes. He also added an additional parameter to standard models to incorporate changes in the size of the ancestral population and of each founder population through time.

His analysis suggests that only about 70 individuals left their ancestral Asian population (estimated at about 9,000 individuals) to reach America 7,000 to 14,000 years ago. Archaeological evidence places the earliest American inhabitants in the New World at around 14,000 years ago. Though Hey's estimates are more recent, they also indicate a high probability at this time period. With this new approach, researchers will be able to explore this and many other questions to fill in the details of the first American immigration.

Citation: Hey J (2005) On the number
'"/>

Source:Public Library of Science


Page: 1 2

Related biology news :

1. Worlds largest rainforest drying experiment completes first phase
2. World-first Living Donor Islet Cell Transplant A Success; Procedure Offers Promise For Diabetics
3. New Estimates For The Causes Of Child Deaths Worldwide
4. OneWorld Health drug receives Orphan designation from U.S. and European regulatory agencies
5. Measles Deaths Worldwide Drop By Nearly 40% Over Five Years
6. Ancient DNA helps clarify the origins of two extinct New World horse species
7. UN: World in big ecological mess
8. IMF Launches World’s First DNA Database for Myeloma Patients
9. World-first technology enables study of ancient bacteria
10. Biologist Discovers What May Be World’s ‘Pickiest?Mates
11. Ancient trans-Atlantic swarm brought locusts to the New World
Post Your Comments:
*Name:
*Comment:
*Email:
TAG: New World founders small number

(Date:10/14/2014)... Sinai-led research team has discovered a new kind of stem ... cell that lines liver blood vessels, according to a study ... The existence of such a cell type contradicts current theory ... and may hold clues to origins of, and future treatment ... a single cell into a complex being made up of ...
(Date:10/14/2014)... – Scientists from The Scripps Research Institute (TSRI) have ... Health (NIH) to lead an investigation of Lassa fever ... Africa. The study aims to understand how Lassa fever ... others survive the inflection. , "The ultimate goal ... how Lassa fever virus causes disease and develop new ...
(Date:10/14/2014)... international team of researchers, led by the Chinese Academy ... Nature Genetics a brief genomic history of ... the tomato plant. , The C.M. Rick Tomato Genetics ... in this study by providing seed of both cultivated ... which builds on the first tomato genome sequence completed ...
Breaking Biology News(10 mins):Stem cell discovery challenges dogma on how fetus develops; holds insights for liver cancer and reg 2Stem cell discovery challenges dogma on how fetus develops; holds insights for liver cancer and reg 3Scripps Research Institute team receives $6.6 million to investigate deadly Lassa virus 2
... the game was designed to make a lefty the ... Douglas Professor of Engineering at Washington University in St. ... mechanical engineer who specializes in aircraft and helicopter engineering ... Pastime. First of all, some numbers. "Ninety percent of ...
... from UC San Diego are collaborating with scientists ... to map patterns of biodiversity and land use ... combined with climate models, will project how climate ... policy for setting aside conservation easements. Wildlife, ...
... interview with a researcher, please contact the Communications and External ... For more information on ORNL and its research and development ... you have a general media-related question or comment, you can ... ENERGY -- Spent fuel pellets . . . ...
Cached Biology News:Baseball diamonds: the lefthander's best friend 2Biodiversity maps developed by UCSD scientists will help guide conservation measures in East Africa 2Biodiversity maps developed by UCSD scientists will help guide conservation measures in East Africa 3Story tips from the Department of Energy's Oak Ridge National Laboratory, July 2008 2Story tips from the Department of Energy's Oak Ridge National Laboratory, July 2008 3
(Date:10/22/2014)... Research and Markets  has announced the addition of ... Geography - Global Analysis and Forecast (2014 - 2020)" ... electronics, also called as polymer electronics or plastic electronics, ... small conductive molecules and electrically conductive polymers. It is ... carbon based, made using synthetic strategies developed in the ...
(Date:10/20/2014)... Convey Computer , the leader in ... State University won first place in the 2014 ... the team’s solution achieved the highest overall performance in ... place finisher. , Experts from all segments of the ... challenge, using a variety of design tools, hardware and ...
(Date:10/20/2014)... GAITHERSBURG, Md. , Oct. 20, 2014  GenVec, Inc. ... Zola P. Horovitz , Ph.D., from its board of ... GenVec board in August 2003, and served as its chairman ... also served on the Nominating and Corporate Governance and Audit ... Zola for more than a decade of dedicated service to ...
(Date:10/20/2014)... Local veterinary surgeon, Dr. Tim McCarthy ... of donor stem cells for dogs with osteoarthritis. Dr. ... has performed clinical stem cell therapy for 7 years. ... if a single injection of donor stem cells into ... pain and inflammation in the treated joints. , ...
Breaking Biology Technology:Global Organic Electronics (Semiconductor, Conductive, Dielectric and Substrate) Market - Analysis and Forecast (2014 - 2020) 2Global Organic Electronics (Semiconductor, Conductive, Dielectric and Substrate) Market - Analysis and Forecast (2014 - 2020) 3Team from Iowa State Wins 2014 MemoCODE Design Contest Using Convey HC-2ex 2Team from Iowa State Wins 2014 MemoCODE Design Contest Using Convey HC-2ex 3Zola P. Horovitz To Retire From GenVec Board 2Cascade Veterinary Referral Center Seeks Candidates for an Investigational Study of Stem Cells for Dogs with Arthritis 2
... device, called a "spaser," is the first of its ... component for possible future technologies based on "nanophotonic" circuitry, ... of Electrical and Computer Engineering at Purdue University. ... lasers can,t be made small enough to integrate them ...
... Ohio State University researchers have developed a new method ... They are using this simple, fast, and low-temperature process ... industrial chemicals (TICs) and biological warfare agents. The ... the journal Materials Chemistry and Physics . ...
... available in <A HREF=",http://chinese.eurekalert.org/zh/pub_releases/2009-08/ps-wpe081309.php,">Chinese . A ... remove 90 percent of salt from brackish water or ... China and the U.S. Clean water for drinking, ... some parts of the world. Its availability in the ...
Cached Biology Technology:New nanolaser key to future optical computers and technologies 2New nanolaser key to future optical computers and technologies 3New way to make sensors that detect toxic chemicals 2New way to make sensors that detect toxic chemicals 3Wastewater produces electricity and desalinates water 2Wastewater produces electricity and desalinates water 3
... genome-wide microRNA expression profiling and built ... microfluidic on-chip synthesis platform. These microarrays ... comprehensive microRNA Expression Profiling Service. ... microRNA Microarray contains all known arabidopsis ...
... Microarrays designed for genome-wide microRNA expression profiling ... Paraflo microfluidic on-chip synthesis platform. These microarrays ... microRNA Expression Profiling Service. Probe ... all known cow microRNAs (108 unique mature ...
... microRNA expression profiling and built on ... on-chip synthesis platform. These microarrays are ... microRNA Expression Profiling Service. ... Microarray contains all known virus microRNAs ...
...
Biology Products: