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Genetic structure, migration, and patterns of allelic richness among coho salmon (Oncorhynchus kisutch) populations of the Oregon coast

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Abstract:

Genotypic data from eight microsatellite loci are used to infer population structure, effective population size, migration rates, and patterns of allelic richness among wild and hatchery populations of Oregon coastal coho salmon (Oncorhynchus kisutch). Corroborating the results of a previous study, we found relatively weak genetic structure among coho from different river basins, although some geographically and ecologically defined clades are supported. Contemporary migration rates among basins appear to be high and asymmetrical. Hatchery populations tended to resemble the wild populations from which they were founded, but presented significantly lower levels of allelic richness. Allelic richness was also low in Oregon coastal lake populations and peaked in the central region of the evolutionarily significant unit among wild river populations. We suggest that the observed patterns may reflect both current source–sink dynamics and post-Pleistocene colonization events.

Les données génotypiques provenant de huit locus microsatellites nous ont servi à déduire la structure de la population, la taille effective de la population, les taux de migration et les patrons de richesse allélique chez des populations sauvages et de pisciculture de saumons coho (Oncorhynchus kisutsch) de la région côtière de l’Oregon. Nous trouvons une structure génétique relativement faible parmi les saumons coho des divers bassins versants, ce qui corrobore les résultats d’une étude antérieure; néanmoins, il y a évidence de quelques clades définis géographiquement ou écologiquement. Les taux de migration actuels d’un bassin à l’autre semblent être élevés et asymétriques. Les populations de pisciculture tendent à ressembler aux populations sauvages dont elles sont issues, mais elles affichent des taux significativement plus bas de richesse allélique. La richesse allélique est également basse dans les populations lacustres de la côte de l’Oregon et elle atteint son maximum dans la région centrale de l’unité évolutive significative parmi les populations sauvages d’eau courante. Nous pensons que les patrons observés sont le reflet à la fois de la dynamique actuelle de type source–drain et des événements de la colonisation après le pléistocène.

Document Type: Research Article

Publication date: July 1, 2008

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  • Published continuously since 1901 (under various titles), this monthly journal is the primary publishing vehicle for the multidisciplinary field of aquatic sciences. It publishes perspectives (syntheses, critiques, and re-evaluations), discussions (comments and replies), articles, and rapid communications, relating to current research on cells, organisms, populations, ecosystems, or processes that affect aquatic systems. The journal seeks to amplify, modify, question, or redirect accumulated knowledge in the field of fisheries and aquatic science. Occasional supplements are dedicated to single topics or to proceedings of international symposia.
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