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:7/9/2015)... , July 07, 2015 ... the addition of the "Biometrics for Banking; ... 2015-2020" report to their offering. ... contributor to this growth and the forecast is ... in revenue for companies involved in delivering biometric ...
(Date:7/8/2015)... -- Summary Pancreatic cancer is the 12th most ... a mortality rate of 10.9 deaths per 100,000 people ... has highlighted a significant need for new and improved ... the current market. A highly active pancreatic cancer ... types and mechanisms of action, which provides a striking ...
(Date:7/8/2015)... 8, 2015 The consumer products industry ... must have products such as wearables, smart wallets & other ... biometrics based devices continues to rapidly grow.  Biometrics & Wearable ... NXTD ), Google Inc. (NASDAQ: GOOG ), Apple Inc. ... GoPro, Inc. (NASDAQ: GPRO ) and Baidu Inc. (NASDAQ: ...
Breaking Biology News(10 mins):Global Banking Biometrics Market 2015-2020 - Market & Technology Analysis, Adoption Strategies and Forecasts 2Global Banking Biometrics Market 2015-2020 - Market & Technology Analysis, Adoption Strategies and Forecasts 3Frontier Pharma: Pancreatic Cancer - Identifying and Commercializing First-in-Class Innovation 2Frontier Pharma: Pancreatic Cancer - Identifying and Commercializing First-in-Class Innovation 3Consumers Flock to This Summer's Must Have Tech Gadgets as Latest Digital Wallets, Smart Technology & Wearable Products Continue to Grow in Popularity & Functionality 2