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Relationships between heterozygosity, allelic distance (d2), and reproductive traits in chinook salmon, Oncorhynchus tshawytscha

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Abstract:

Correlations of various measures of individual genetic variation with fitness have been reported in a number of taxa; however, the genetic nature of such correlations remains uncertain. To explore this, we mated 100 male and 100 female chinook salmon (Oncorhynchus tshawytscha) in a one-to-one breeding design and quantified reproductive fitness and allocation (male gonadosomatic index, GSI; female fecundity; egg size; egg survival). Each fish was scored for allele size at seven microsatellite loci. We applied univariate and multivariate regression models incorporating two genetic variation statistics (microsatellite heterozygosity and squared allelic distance, d2) with reproductive parameters. The majority of the relationships were found to be nonsignificant; however, we found significant, positive, univariate relationships for fecundity and GSI (25% of tests) and significant, multivariate relationships at individual loci for all four traits (13% of tests). One microsatellite locus, Omy207, appeared to be closely associated with reproductive fitness in female chinook salmon (but not male), based on the multivariate analysis. Although direct tests for overdominance versus inbreeding effects proved inconclusive, our data are consistent with the presence of both inbreeding (general) and overdominance (local) effects on reproductive traits in chinook salmon.

Dans le passé, des corrélations ont été établies entre diverses mesures de la variation génétique individuelle et le fitness chez un bon nombre de taxons; cependant, la signification génétique de telles corrélations reste obscure. Pour étudier la question, nous avons apparié par couple 100 Saumons quinnat (Oncorhynchus tshawytscha) mâles et 100 femelles et quantifié leur fitness reproducteur et leur allocation reproductive (indice gonosomatique du mâle, GSI; fécondité de la femelle; taille des oeufs; survie des oeufs). Chaque poisson a été évalué quant à la taille des allèles à sept locus microsatellites. La majorité des modèles de régression à une et plusieurs variables que nous avons utilisés pour relier deux mesures de la variation génétique (hétérozygosité des microsatellites et distance allélique au carré d2) aux paramètres reproducteurs ont généré des relations nonsignificatives; cependant, nous avons obtenu des relations significatives, positives et unidimensionnelles dans le cas de la fécondité et du GSI (25 % des épreuves) et des relations significatives multidimensionnelles pour les 4 variables à des locus individuels (13 % des épreuves). Un locus microsatellite, Omy207, semble fortement associé au fitness reproducteur chez les Saumons quinnat femelles (mais pas chez les mâles), d'après l'analyse multidimensionnelle. Bien que les tests directs pour distinguer les effets de la surdominance de ceux de la consanguinité n'aient pas été concluants, nos données s'accordent avec la présence à la fois d'effets généraux de la consanguinité et d'effets locaux de la surdominance sur les caractéristiques reproductives du Saumon quinnat.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: January 1, 2002

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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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