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Genetic diversity in a remnant population of lake trout (Salvelinus namaycush)

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Genetic diversity of the remnant population of lake trout (Salvelinus namaycush (Walbaum in Artedi, 1792)) in Crean Lake was compared with that for two other populations in the Prince Albert National Park (PANP) using single-strand conformation polymorphism (SSCP) and DNA sequencing analyses of two mtDNA genes. Although there was no sequence variation among individuals for nad5, six different nad2 haplotypes were detected. The Crean Lake population had the least number of haplotypes and lowest nucleotide variation. Also, one common nad2 haplotype in Crean Lake was not detected in the other populations. The results suggest that introductions of lake trout from Wassegam Lake into Crean Lake were unsuccessful with respect to the establishment and (or) reproduction of the stocked fish. Conservation of the remnant population of lake trout in Crean Lake is important because it is genetically distinct from other populations within PANP and in adjacent areas.

Nous comparons la diversité génétique de la population relique de touladis (Salvelinus namaycush (Walbaum in Artedi, 1792)) du lac Crean à celle de deux autres populations du parc national de Prince-Albert (PANP) à l’aide d’analyses du polymorphisme de configuration d’un simple brin (SSCP) et de séquençage d’ADN de deux gènes d’ADNmt. Bien qu’il n’y ait pas de variation entre les individus dans les séquences de nad5, six haplotypes différents de nad2 ont été décelés. La population du lac Crean possède le nombre le moins élevé d’haplotypes et la variation la plus basse des nucléotides. De plus, un des haplotypes de nad2 fréquent au lac Crean n’a pas été retrouvé dans les deux autres populations. Ces résultats font croire que les introductions de touladis dans le lac Crean à partir du lac Wassegam n’ont pas réussi en ce qui a trait à l’établissement et(ou) la reproduction des poissons ensemencés. La conservation de la population relique du lac Crean est donc importante, car il s’agit d’une population distincte des autres populations du PANP et des régions adjacentes.
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Document Type: Research Article

Publication date: 2009-07-01

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  • Published since 1929, this monthly journal reports on primary research contributed by respected international scientists in the broad field of zoology, including behaviour, biochemistry and physiology, developmental biology, ecology, genetics, morphology and ultrastructure, parasitology and pathology, and systematics and evolution. It also invites experts to submit review articles on topics of current interest.
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