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Genetic differentiation on multiple spatial scales in an ecotype-forming marine snail with limited dispersal: Littorina saxatilis

Artikel i vetenskaplig tidskrift
Författare Tuuli Mäkinen
Marina Panova
Kerstin Johannesson
Andrey Tatarenkov
Christin Appelqvist
Carl André
Publicerad i Biological Journal of the Linnean Society
Volym 94
Nummer/häfte 1
Sidor 31-40
ISSN 0024-4066
Publiceringsår 2008
Publicerad vid Institutionen för marin ekologi, Tjärnö marinbiologiska laboratorium
Institutionen för marin ekologi
Sidor 31-40
Språk en
Länkar <Go to ISI>://000255463300004
Ämnesord allozymes, gene flow, genetic structure, isolation by distance, microsatellites, parallel evolution, microsatellite DNA markers, cod gadus-morhua, population-structure, allozyme variation, geographic distance, olivi prosobranchia, natural-selection, f-statistics, flow, locus
Ämneskategorier Biologiska vetenskaper

Sammanfattning

The population genetic structure of marine species lacking free-swimming larvae is expected to be strongly affected by random genetic drift among populations, resulting in genetic isolation by geographical distance. At the same time, ecological separation over microhabitats followed by direct selection on those parts of the genome that affect adaptation might also be strong. Here, we address the question of how the relative importance of stochastic vs. selective structuring forces varies at different geographical scales. We use microsatellite DNA and allozyme data from samples of the marine rocky shore snail Littorina saxatilis over distance scales ranging from metres to 1000 km, and we show that genetic drift is the most important structuring evolutionary force at distances > 1 km. On smaller geographical scales (< 1 km), divergent selection between contrasting habitats affects population genetic structure by impeding gene flow over microhabitat borders (microsatellite structure), or by directly favouring specific alleles of selected loci (allozyme structure). The results suggest that evolutionary drivers of population genetic structure cannot a priori be assumed to be equally important at different geographical scales. (C) 2008 The Linnean Society of London.

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