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Seascape analysis reveals regional gene flow patterns among populations of a marine planktonic diatom

Journal article
Authors Anna Godhe
Jenny Egardt
David Kleinhans
Lisa Sundqvist
Robinson Hordoir
Per R. Jonsson
Published in Proceedings of the Royal Society of London. Biological Sciences
Volume 280
Issue 1773
ISSN 0962-8452
Publication year 2013
Published at Department of Biological and Environmental Sciences
Language en
Keywords oceanographic connectivity, Bacillariophyceae, microsatellites, Skeletonema marinoi
Subject categories Biological Sciences


We investigated the gene flow of the common marine diatom, Skeletonema marinoi, in Scandinavian waters and tested the null hypothesis of panmixia. Sediment samples were collected from the Danish Straits, Kattegat and Skagerrak. Individual strains were established from germinated resting stages. A total of 350 individuals were genotyped by eight microsatellite markers. Conventional F-statistics showed significant differentiation between the samples. We therefore investigated whether the genetic structure could be explained using genetic models based on isolation by distance (IBD) or by oceanographic connectivity. Patterns of oceanographic circulation are seasonally dependent and therefore we estimated how well local oceanographic connectivity explains gene flow month by month. We found no significant relationship between genetic differentiation and geographical distance. Instead, the genetic structure of this dominant marine primary producer is best explained by local oceanographic connectivity promoting gene flow in a primarily south to north direction throughout the year. Oceanographic data were consistent with the significant FST values between several pairs of samples. Because even a small amount of genetic exchange prevents the accumulation of genetic differences in F-statistics, we hypothesize that local retention at each sample site, possibly as resting stages, is an important component in explaining the observed genetic structure.

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