Linked Life Data

20561196

Source:http://linkedlifedata.com/resource/pubmed/id/20561196

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pubmed-article:20561196pubmed:abstractTextTo assess the effects of altitude on the level and structure of genetic diversity, a genetic survey was conducted in 12 populations of sessile oak (Quercus petraea) located between 130 and 1660 m in two parallel valleys on the northern side of the Pyrenees Mountains. Genetic diversity was monitored at 16 nuclear microsatellite loci and 5 chloroplast DNA (cpDNA) markers. The cpDNA survey suggested that extant populations in both valleys shared the same source populations from the plain. There was no visible trend of nuclear genetic diversity along altitude, even if indirect estimates of effective population sizes revealed a consistent reduction at higher altitudes. Population differentiation, although low, was mostly present among populations of the same valleys and reached similar levels than differentiation across the range of distribution of sessile oak. Contribution to the overall differentiation in the valleys was mostly due to the genetic divergence of the highest populations and the altitudinal variation of allelic frequencies at a few loci. Bayesian inference of migration between groups of populations showed that gene flow is preferentially unidirectional from lower altitudes in one valley to other groups of populations. Finally, we found evidence of clonal reproduction in high altitude populations. The introgression of Quercus robur and Quercus pubescens was also more frequent at the altitudinal margin suggesting that this mechanism may have contributed to the present migration and adaptation of Q. petraea and may also facilitate its future upslope shift in the context of climate change.lld:pubmed
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pubmed-article:20561196pubmed:articleTitlePopulation differentiation of sessile oak at the altitudinal front of migration in the French Pyrenees.lld:pubmed
pubmed-article:20561196pubmed:affiliationINRA, UMR 1202 Biodiversité Gènes et Communautés, Cestas, F-33610, France.lld:pubmed
pubmed-article:20561196pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:20561196pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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