Long-Distance Dispersal Shaped Patterns of Human Genetic Diversity in Eurasia.

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Serval ID
serval:BIB_6B4D91EBA2A8
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Long-Distance Dispersal Shaped Patterns of Human Genetic Diversity in Eurasia.
Journal
Molecular Biology and Evolution
Author(s)
Alves I., Arenas M., Currat M., Sramkova Hanulova A., Sousa V.C., Ray N., Excoffier L.
ISSN
1537-1719 (Electronic)
ISSN-L
0737-4038
Publication state
Published
Issued date
2016
Peer-reviewed
Oui
Volume
33
Number
4
Pages
946-958
Language
english
Abstract
Most previous attempts at reconstructing the past history of human populations did not explicitly take geography into account or considered very simple scenarios of migration and ignored environmental information. However, it is likely that the last glacial maximum (LGM) affected the demography and the range of many species, including our own. Moreover, long-distance dispersal (LDD) may have been an important component of human migrations, allowing fast colonization of new territories and preserving high levels of genetic diversity. Here, we use a high-quality microsatellite data set genotyped in 22 populations to estimate the posterior probabilities of several scenarios for the settlement of the Old World by modern humans. We considered models ranging from a simple spatial expansion to others including LDD and a LGM-induced range contraction, as well as Neolithic demographic expansions. We find that scenarios with LDD are much better supported by data than models without LDD. Nevertheless, we show evidence that LDD events to empty habitats were strongly prevented during the settlement of Eurasia. This unexpected absence of LDD ahead of the colonization wave front could have been caused by an Allee effect, either due to intrinsic causes such as an inbreeding depression built during the expansion or due to extrinsic causes such as direct competition with archaic humans. Overall, our results suggest only a relatively limited effect of the LGM contraction on current patterns of human diversity. This is in clear contrast with the major role of LDD migrations, which have potentially contributed to the intermingled genetic structure of Eurasian populations.
Keywords
human evolution, long-distance dispersal, last glacial maximum, out of Africa
Pubmed
Web of science
Open Access
Yes
Create date
19/06/2016 17:05
Last modification date
20/08/2019 14:25
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