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Genetic differentiation in walleye pollock (Theragra chalcogramma) in response to selection at the pantophysin (PanI) locus

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Samples of walleye pollock (Theragra chalcogramma) from the North Pacific Ocean and Bering Sea were screened for variation at the pantophysin (PanI) locus. Global genetic differentiation across samples (FST = 0.038) was considerably greater than reported in previous population studies using allozymes, mtDNA, or microsatellite loci and significantly greater than FST distributions of neutral loci simulated over a large range of locus heterozygosity. PanI allele frequencies varied over a broad latitudinal gradient and were correlated with estimated mean surface temperatures, resulting in the greatest levels of genetic divergence between the northern Bering Sea and the southernmost locations in the temperate Pacific Ocean (Puget Sound, Japan). The discordance between estimates of population differentiation estimated from PanI and other neutral marker classes, both in magnitude and in geographic patterns, could arise from temperature-mediated effects of natural selection over broad geographic scales. Our empirical results suggest that loci subject to directional selection may prove to be useful markers for stock identification in weakly structured marine fishes.

Nous avons évalué la variation au locus de la pantophysine (PanI) dans des échantillons de goberges de l'Alaska (Theragra chalcogramma) du nord du Pacifique et de la mer de Bering. La différentiation génétique globale parmi les échantillons (FST = 0,038) est considérablement plus élevée que celle qui a été signalée dans les études démographiques antérieures portant sur les allozymes, l'ADN mitochondrial (ADNmt) ou les locus microsatellites et significativement plus grande que les distributions simulées de FST de locus neutres sur une gamme étendue d'hétérozygotie des locus. Les fréquences de l'allèle PanI varient sur un large gradient de latitudes et sont en corrélation avec les températures moyennes de surface estimées; le niveau le plus élevé de divergence génétique s'observe entre le nord de la mer de Bering et les sites les plus au sud du Pacifique tempéré (Puget Sound, Japon). La discordance entre les estimations de différentiation des populations faites au moyen de PanI et les autres classes de marqueurs neutres, tant au niveau de l'importance que de la répartition géographique, peut être due à des effets de la sélection naturelle sur de grandes échelles géographiques, modulés par la température. Nos résultats empiriques laissent croire que les locus sujets à la sélection directionnelle peuvent être des marqueurs utiles pour l'identification des stocks dans les populations de poissons marins peu structurées.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: November 1, 2005

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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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