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Low but contrasting neutral genetic differentiation shaped by winter temperature in European great tits
Univ Zurich, Inst Evolutionary Biol & Environm Studies, Winterthurerstr 190, CH-8057 Zurich, Switzerland..
Univ Bern, Inst Ecol & Evolut, Aquat Ecol & Evolut, Baltzerstr 6, CH-3012 Bern, Switzerland.;Univ Sheffield, Dept Anim & Plant Sci, Sheffield S10 2TN, S Yorkshire, England..
Ctr Ecol Fonct & Evolut, UMR 5175, 1919 Route Mende, FR-34293 Montpellier 5, France..
Univ Bern, Inst Ecol & Evolut, Div Evolutionary Ecol, Baltzerstr 6, CH-3012 Bern, Switzerland..
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2016 (English)In: Biological Journal of the Linnean Society, ISSN 0024-4066, E-ISSN 1095-8312, Vol. 118, no 3, 668-685 p.Article in journal (Refereed) PublishedText
Abstract [en]

Gene flow is usually thought to reduce genetic divergence and impede local adaptation by homogenising gene pools between populations. However, evidence for local adaptation and phenotypic differentiation in highly mobile species, experiencing high levels of gene flow, is emerging. Assessing population genetic structure at different spatial scales is thus a crucial step towards understanding mechanisms underlying intraspecific differentiation and diversification. Here, we studied the population genetic structure of a highly mobile species - the great tit Parus major - at different spatial scales. We analysed 884 individuals from 30 sites across Europe including 10 close-by sites (< 50 km), using 22 microsatellite markers. Overall we found a low but significant genetic differentiation among sites (F-ST = 0.008). Genetic differentiation was higher, and genetic diversity lower, in south-western Europe. These regional differences were statistically best explained by winter temperature. Overall, our results suggest that great tits form a single patchy metapopulation across Europe, in which genetic differentiation is independent of geographical distance and gene flow may be regulated by environmental factors via movements related to winter severity. This might have important implications for the evolutionary trajectories of sub-populations, especially in the context of climate change, and calls for future investigations of local differences in costs and benefits of philopatry at large scales.

Place, publisher, year, edition, pages
2016. Vol. 118, no 3, 668-685 p.
Keyword [en]
F-statistics, isolation-by-distance, latitude, microsatellites, Parus major, Population genetic structure, winter severity
National Category
Evolutionary Biology
URN: urn:nbn:se:uu:diva-301028DOI: 10.1111/bij.12745ISI: 000379783400017OAI: oai:DiVA.org:uu-301028DiVA: diva2:953320
Available from: 2016-08-17 Created: 2016-08-17 Last updated: 2016-08-17Bibliographically approved

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