Population structure and stock identification of chum salmon (Oncorhynchus keta) from British Columbia determined with microsatellite DNA variation

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Abstract:

Variation at 14 microsatellite loci was surveyed in 205 populations of chum salmon (Oncorhynchus keta (Walbaum in Artedi, 1792)) from British Columbia to determine population structure and the possible application of microsatellites to estimate stock composition of chum salmon in mixed-stock fisheries. The genetic differentiation index (FST) over all populations and loci was 0.016, with individual locus values ranging from 0.006 to 0.059. Sixteen regional stocks were defined in British Columbia for stock identification applications. Analysis of simulated fishery samples suggested that accurate and precise regional estimates of stock composition should be produced when the microsatellites were used to estimate stock compositions. The main stocks that constitute the October 2007 samples of migrating chum salmon through Johnstone Strait in southern British Columbia were Fraser River (45%-64%), southern British Columbia mainland (22%), and east coast Vancouver Island (13%-28%), within the range of those to be expected in samples from Johnstone Strait. Microsatellites have the ability to provide fine-scale resolution of stock composition in British Columbia coastal fisheries.

Nous avons évalué la variation à 14 locus microsatellites chez 205 populations de saumons kéta (Oncorhynchus keta (Walbaum in Artedi, 1792)) de Colombie-Britannique pour déterminer la structure de population et l’utilisation potentielle des microsatellites pour estimer la composition des stocks de saumons kéta dans les pêches à stocks multiples. Le coefficient de différenciation génétique (FST) dans l’ensemble des populations et des locus est de 0,016 et les valeurs varient de 0,006 à 0,059 pour les locus individuels. Nous avons défini 16 stocks régionaux en Colombie-Britannique pour servir à l’indentification des stocks. Une analyse d’échantillons de pêche simulés indique que l’utilisation des microsatellites pour l’identification des stocks devrait permettre des estimations régionales justes et précises de la composition des stocks. Les stocks principaux qui composent les échantillons de pêche d’octobre 2007 de saumons kéta en migration dans le détroit de Johnstone dans le sud de la Colombie-Britannique sont ceux du Fraser (45 % - 64 %), de la région continentale du sud de la Colombie-Britannique (22 %) et de la côte est de l’île de Vancouver (13 % - 28 %), tous dans l’ensemble des stocks attendus dans des échantillons du détroit de Johnstone. Les microsatellites permettent donc la détermination à échelle fine de la composition des stocks dans les pêches côtières de la Colombie-Britannique.

Document Type: Research Article

Publication date: September 1, 2008

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  • Published since 1929, this monthly journal reports on primary research contributed by respected international scientists in the broad field of zoology, including behaviour, biochemistry and physiology, developmental biology, ecology, genetics, morphology and ultrastructure, parasitology and pathology, and systematics and evolution. It also invites experts to submit review articles on topics of current interest.
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