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Genetic characterization of Kenai brown bears (Ursus arctos): microsatellite and mitochondrial DNA control region variation in brown bears of the Kenai Peninsula, south central Alaska

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Abstract:

We collected data from 20 biparentally inherited microsatellite loci, and nucleotide sequence from the maternally inherited mitochondrial DNA (mtDNA) control region, to determine levels of genetic variation of the brown bears (Ursus arctos L., 1758) of the Kenai Peninsula, south central Alaska. Nuclear genetic variation was similar to that observed in other Alaskan peninsular populations. We detected no significant inbreeding and found no evidence of population substructuring on the Kenai Peninsula. We observed a genetic signature of a bottleneck under the infinite alleles model (IAM), but not under the stepwise mutation model (SMM) or the two-phase model (TPM) of microsatellite mutation. Kenai brown bears have lower levels of mtDNA haplotypic diversity relative to most other brown bear populations in Alaska.

Nous avons récolté des données sur 20 locus microsatellites hérités des deux parents et sur la séquence de nucléotides de la région de contrôle de l’ADN mitochondrial (ADNmt) héritée de la mère afin de déterminer l’importance de la variation génétique chez les ours bruns (Ursus arctos L., 1758) de la péninsule de Kenai, centre sud de l’Alaska. La variation génétique nucléaire est semblable à celle observée chez d’autres populations péninsulaires de l’Alaska. Il n’y a aucune endogamie significative, ni d’indication de sous-structuration de la population sur la péninsule de Kenai. Nous observons une signature génétique d’un goulot d’étranglement dans le modèle des allèles infinis (IAM), mais non dans le modèle de mutation par étape (SMM) ni dans celui de mutation microsatellite en deux phases (TPM). Les ours bruns de Kenai possèdent des niveaux de diversité haplotypique de l’ADNmt plus faibles que la plupart des autres populations d’ours bruns de l’Alaska.

Document Type: Research Article

Publication date: July 1, 2008

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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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