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Population genetics of northern pike (Esox lucius) introduced into Lake Davis, California

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Abstract:

We used molecular genetic techniques to identify the source population of northern pike (Esox lucius) illegally introduced into Lake Davis, California, and to study the dynamics of genetic change since the introduction. We typed 10 tetranucleotide microsatellite loci from 11 populations and used measures of population differentiation, phylogenetic analysis, and assignment tests to determine the origins of the pre- and post-rotenone-treatment populations. We found that levels of genetic differentiation were low between the pre- and both post-treatment Lake Davis samples and phylogenetic analysis revealed that they were all closely related. Assignment tests classified a high proportion of posttreatment individuals to the original Lake Davis population. Consequently, our results indicate that the fish population that reappeared in 1999 and a subsequent sample in 2002 were descendents or survivors of the initial population. We were unable to assign the pre- or post-treatment individuals consistently to any one population from a panel of potential source populations, indicating that the ultimate source of the Lake Davis population was likely not sampled. Genetic signatures of a recent population bottleneck are evident in the samples from Lake Davis and the effective population size over the sampling period was approximately 7–12 individuals.

Des techniques moléculaires nous ont servi à identifier la population d'origine des grand brochets (Esox lucius) introduits illégalement dans le lac Davis, Californie, et à étudier la dynamique des changements génétiques depuis cette introduction. Nous avons caractérisé 10 locus microsatellites à quatre nucléotides dans 11 populations et avons utilisé des mesures de différentiation des populations, une analyse phylogénétique et des tests d'assignation pour déterminer l'origine des populations avant et après le traitement à la roténone. Les niveaux de différentiation génétique entre les échantillons du lac Davis avant et après le traitement sont faibles; l'analyse phylogénétique leur attribue tous une forte parenté. Les tests d'assignation placent un fort pourcentage des individus capturés après le traitement dans la population originale du lac Davis. Nos résultats indiquent donc que la population de poissons qui est réapparue en 1999 et les poissons d'un échantillon subséquent en 2002 sont des descendants ou des survivants de la population initiale. Nous sommes incapables d'assigner de façon constante les individus capturés avant ou après le traitement à l'une de plusieurs populations potentielles d'origine, ce qui laisse croire que la source ultime de la population du lac Davis n'a pas été échantillonnée. Il y a des indications dans les échantillons du lac Davis de signatures génétiques d'un goulot d'étranglement récent dans la population; la taille effective de la population durant la période d'échantillonnage était d'environ 7–12 individus.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: July 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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