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ICES Journal of Marine Science: Journal du Conseil 2005 62(5):948-955; doi:10.1016/j.icesjms.2005.03.006
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© 2005 International Council for the Exploration of the Sea

Genetic differentiation of blue whiting (Micromesistius poutassou Risso) populations at the extremes of the species range and at the Hebrides–Porcupine Bank spawning grounds

Anthony W. Ryana,*, Valeria Mattiangelia,b and Jarle Morka

a NTNU – Norwegian University of Science and Technology, Trondhjem Biological Station N-7493 Trondheim, Norway
b Aquaculture Development Centre, Department of Zoology and Animal Ecology Lee Maltings, Prospect Row, National University of Ireland, Cork, Ireland

*Correspondence to A. W. Ryan: Institute of Molecular Medicine, Trinity Centre for Health Sciences, St James's Hospital, Dublin 8, Ireland; tel: +353 1 608 3273/3292; fax: +353 1 454 2043. e-mail: aryan12{at}tcd.ie.

The blue whiting, Micromesistius poutassou (Teleostei, Gadidae) is found between latitudes 26° and 82°N along the continental margin of the Northeast Atlantic, with smaller populations in the Northwest Atlantic and the Mediterranean. There is an annual spawning aggregation on the Porcupine Bank and Hebridean Shelf (west of Ireland and Scotland, respectively), where most of the blue whiting population of the Northeast Atlantic spawns. Analysis of samples from the Barents Sea, the Northeast Atlantic, and the Mediterranean (n = 850, 11 samples) using one minisatellite and five microsatellite loci revealed significant geographic heterogeneity and isolated populations at the extremes of the species range in the Barents Sea and the Mediterranean. Furthermore, there was evidence of genetic heterogeneity among samples taken during the spawning season on the Porcupine Bank and Hebridean Shelf, with highly significant differentiation between the samples taken in the Hebrides in 1992 and 1998.

Keywords: genetic differentiation, marine species, Micromesistius, microsatellites, minisatellites

Received 28 November 2004; accepted 5 March 2005.


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