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ICES Journal of Marine Science: Journal du Conseil Advance Access originally published online on December 14, 2007
ICES Journal of Marine Science: Journal du Conseil 2008 65(1):65-71; doi:10.1093/icesjms/fsm181
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© 2007 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Genetic divergence among East Icelandic and Faroese populations of Atlantic cod provides evidence for historical imprints at neutral and non-neutral markers

Christophe Pampoulie1,, Pétur Steingrund2, Magnus Ö. Stefánsson1 and Anna K. Daníelsdóttir1

1 Marine Research Institute, Skúlagata 4, 101 Reykjavík, Iceland
2 Faroese Fisheries Laboratory, Nóatún, PO Box 3051, FO-110 Tórshavn, Faroe Islands

Correspondence to C. Pampoulie: tel: +354 575 2038; fax: +354 575 2001; e-mail: chrisp{at}hafro.is

Pampoulie, C., Steingrund, P., Stefánsson, M. Ö., and Daníelsdóttir, A. K. 2008. Genetic divergence among East Icelandic and Faroese populations of Atlantic cod provides evidence for historical imprints at neutral and non-neutral markers. – ICES Journal of marine Science, 65: 65–71.

During the past decade, genetic markers have been used increasingly to improve stock discrimination and to aid fisheries management. Today, the Icelandic and Faroese Plateau cod (Gadus morhua) are managed as separate units, belonging to ICES Subareas Va and Vb1, respectively. There is little information on the genetic connectivity of the two units, however, except in terms of tagging experiments which revealed limited adult migration between the two areas, and few genetic studies describing genetic differentiation among Faroese and East Icelandic cod. Here, previously published data on the genetic structure of Icelandic cod were combined with new data from the Faroe Plateau to assess the level and the source of genetic variability of Atlantic cod around the Iceland–Faroe Ridge and the potential sources of genetic variation. In all, 771 cod were genotyped at nine microsatellite loci and at the Pantophysin locus (Pan I). The genetic markers employed were congruent and showed that South Icelandic and East Icelandic–Faroese Plateau populations have limited genetic connectivity. Diversifying selection associated with restricted gene flow is likely to explain the observed pattern with the Pan I locus. Further analyses detected historical imprints in the microsatellite data, suggesting that the divergence could be due to isolation of different cod populations during the last glacial maximum.

Keywords: Faroe Islands, Gadus morhua, historical signal, Iceland, microsatellite loci, migration, Pantophysin

Received 19 June 2007; accepted 26 October 2007; advance access publication 14 December 2007.


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