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Oceanographic connectivity and environmental correlates of genetic structuring in Atlantic herring in the Baltic Sea

Journal article
Authors A. G. Teacher
Carl André
Per R. Jonsson
J. Merilä
Published in Evolutionary Applications
Volume 6
Issue 3
Pages 549-567
ISSN 1752-4571
Publication year 2013
Published at Department of Biological and Environmental Sciences, Tjärnö Marine Biological Laboratory
Pages 549-567
Language en
Links dx.doi.org/10.1111/eva.12042
Keywords Baltic Sea, Clupeaharengus, Fisheries, Genetics, Herring, Microsatellite, Selection, Transcriptome
Subject categories Marine ecology

Abstract

Marine fish often show little genetic structuring in neutral marker genes, and Atlantic herring (Clupea harengus) in the Baltic Sea are no exception; historically, very low levels of population differentiation (FST ≈ 0.002) have been found, despite a high degree of interpopulation environmental heterogeneity in salinity and temperature. Recent exome sequencing and SNP studies have however shown that many loci are under selection in this system. Here, we combined population genetic analyses of a large number of transcriptome-derived microsatellite markers with oceanographic modelling to investigate genetic differentiation and connectivity in Atlantic herring at a relatively fine scale within the Baltic Sea. We found evidence for weak but robust and significant genetic structuring (FST = 0.008) explainable by oceanographic connectivity. Genetic differentiation was also associated with site differences in temperature and salinity, with the result driven by the locus Her14 which appears to be under directional selection (FST = 0.08). The results show that Baltic herring are genetically structured within the Baltic Sea, and highlight the role of oceanography and environmental factors in explaining this structuring. The results also have implications for the management of herring fisheries, the most economically important fishery in the Baltic Sea, suggesting that the current fisheries management units may be in need of revision. © 2013 The Authors. Published by Blackwell Publishing Ltd.

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