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Evidence for the existence of a native population of sockeye salmon (Oncorhynchus nerka) and subsequent introgression with introduced populations in a Pacific Northwest watershed

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The Lake Washington watershed (Washington, USA) has been the recipient of numerous transplantations of nonnative Oncorhynchus nerka (both sockeye salmon and their landlocked form, kokanee) over the past century and currently contains self-sustaining populations of both ecotypes. Microsatellite DNA markers were used to identify native and introduced groups while characterizing population structure. This study confirmed that Baker Lake sockeye transplantations during the 20th century contributed to three current sockeye populations: Cedar River, Issaquah Creek, and Pleasure Point Beach in the Lake Washington watershed. Distinctive allele distributions at two loci, One101 and One114, provide evidence that a fourth Lake Washington sockeye population, Bear Creek, is divergent from other Lake Washington sockeye and may be of substantially native origin despite heavy stocking activity in the watershed over the past century. Data from these loci also suggest the presence of native genes in populations that had been regarded as entirely of introduced origin.

Le bassin versant du lac Washington (Washington, É.-U.) a reçu de nombreux empoissonnements d'Oncorhynchus nerka (tant des saumons rouges que des kokanis non anadromes) non indigènes depuis un siècle; aujourd'hui, il contient des populations autosuffisantes des deux écotypes. Des marqueurs microsatellites de l'ADN nous ont servi à identifier les groupes indigènes et introduits et à caractériser du même coup la structure des populations. Notre étude confirme que les empoissonnements de saumons rouges du lac Baker au cours du 20e siècle ont contribué aux trois populations actuelles de saumons rouges, celles de Cedar River, d'Issaquah Creek et de Pleasure Point Beach dans le bassin versant du lac Washington. Des distributions distinctes d'allèles à deux locus, One 101 et One 114, donnent des indications de l'existence d'une quatrième population de saumons rouges au lac Washington, celle de Bear Creek, qui diverge des autres saumons rouges du lac Washington et qui peut avoir une importante origine indigène malgré les nombreuses activités d'empoissonnement dans le bassin versant au cours du dernier siècle. Des données provenant de ces locus indiquent aussi la présence de gènes indigènes dans ces populations qui ont été considérées comme étant d'origine entièrement extérieure.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: 2007-09-01

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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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