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ICES Journal of Marine Science: Journal du Conseil 2004 61(8):1389-1397; doi:10.1016/j.icesjms.2004.08.011
© 2004 by ICES/CIEM International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer
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Conservation of genetic variation in harvested salmon populations

Kjetil Hindara,*, Jarle Tuftob, Leif Magnus Sættemc and Torveig Balstada

a NINA Tungasletta 2, N-7485 Trondheim, Norway
b Department of Mathematical Sciences, NTNU N-7491 Trondheim, Norway
c Department of Environment County Governor of Møre and Romsdal, N-6404 Molde, Norway

*Correspondence to K. Hindar: tel: +47 73 80 15 46; fax: +47 73 80 14 01. e-mail: kjetil.hindar{at}nina.no.

Management of a group of Atlantic salmon (Salmo salar) populations that are harvested together in the ocean, but separately in freshwater, is looked at from a genetic perspective. A model that estimates total effective population size from local effective population sizes and migration patterns is applied to a system of ten salmon populations in the Sognefjorden district, western Norway. This population system is dominated numerically by the River Lærdalselva population, which may act as a source of migrants into nine smaller populations in a "source–sink" metapopulation. The total effective population size of this system is to a large extent dependent on the effective population size of the Lærdalselva population, but the contribution per spawner to the total effective population size is greater for a fish from the smaller populations than for a fish from Lærdalselva. The results are discussed in light of conservation genetic theory, and empirical results on the fitness consequences of loss of genetic variation in salmonids. The genetic consequences of harvesting need to be assessed both at the levels of local populations and the metapopulation.

Keywords: Atlantic salmon, fisheries management, genetics, metapopulation, Norway, subdivided population

Received 27 January 2004; accepted 4 July 2004.


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