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Spread of hybridization between native westslope cutthroat trout, Oncorhynchus clarki lewisi, and nonnative rainbow trout, Oncorhynchus mykiss

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Abstract:

We examined spatial and temporal patterns of hybridization between native westslope cutthroat trout, Oncorhynchus clarki lewisi, and nonnative rainbow trout, O. mykiss, in streams of the Flathead River system in Montana, U.S.A. We detected hybridization in 24 of 42 sites sampled from 1998 to 2001. We found new Oncorhynchus mykiss introgression in seven of 11 sample populations that were determined to be nonhybridized in 1984. Patterns of spatial autocorrelation and linkage disequilibrium indicated that hybridization is spreading among sites and is advancing primarily via post-F1 hybrids. Although hybridized populations were distributed widely throughout the study area, the genetic contribution from O. mykiss decreased with increasing upstream distance from the Flathead River mainstem, suggesting that O. mykiss introgression is spreading in an upstream direction. The spread of hybridization may be constrained more by demographic than by environmental factors, given that (i) hybridized populations generally encompassed the range of environmental variability in nonhybridized populations, and (ii) hybridization status was more strongly associated with neighborhood statistics than measured environmental gradients.

Nous avons examiné les patterns spatiaux et temporels de l'hybridation de la truite fardée indigène du versant occidental, Oncorhynchus clarki lewisi, avec la truite arc-en-ciel non indigène, Oncorhynchus mykiss, dans des cours d'eau du système hydrographique de la Flathead au Montana, États-Unis. Il y avait de l'hybridation dans 24 des 42 sites examinés de 1998 à 2001. De nouvelles introgressions d'O. mykiss ont été trouvées dans sept de 11 populations qui ne montraient aucun signe d'hybridation en 1984. Les patterns d'autocorrélation spatiale et de déséquilibre d'association indiquent que l'hybridation se répand d'un site à l'autre, surtout par l'intermédiaire des hybrides post-F1. Bien que les populations hybrides soient largement réparties dans la zone d'étude, la contribution génétique d'O. mykiss décroît en fonction de la distance en amont depuis le cours principal de la Flathead, ce qui laisse croire que l'introgression d'O. mykiss se répand vers l'amont. La propagation de l'hybridation semble être davantage contrôlée par des facteurs démographiques qu'environnementaux, puisque (i) les populations hybrides subissent la même gamme de variations des conditions de l'environnement que les populations pures et (ii) le statut de l'hybridation est plus fortement associé aux mesures de proximité qu'aux gradients environnementaux étudiés.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: December 1, 2003

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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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