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Genetic fragmentation of populations of the fluvial sculpin Cottus nozawae (Pisces: Cottidae) at the southern margin of its native range

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Abstract:

The influence of fragmentation on local genetic population structure of the fluvial sculpin Cottus nozawae was studied by comparing populations in two regions: the Tohoku District (the southern margin of the species' native range) and Hokkaido Island (the center of its native range), Japan, based on restriction fragment length polymorphism analysis of mitochondrial DNA amplified by means of the polymerase chain reaction. Relatively high genetic divergences were found among populations from different regions. An analysis of molecular variance showed that ΦST values among samples from the same river system in the Tohoku District were higher than among samples from Hokkaido Island. Heterogeneities in haplotype composition among tributary populations and among distinctive clusters were also found in the Tohoku District river system. Cottus nozawae in the Tohoku District are distributed patchily in headwater streams and may be thermally isolated. As a result, there appears to be little gene flow among tributary populations from different areas that exhibit divergence due to random genetic drift and have small effective population sizes.

L'influence de la fragmentation sur la structure génétique des populations locales de Cottus nozawae a été étudiée par comparaison des populations de deux régions du Japon, le district de Tohoku (à la limite sud de la répartition naturelle de l'espèce) et l'île d'Hokkaido (au centre de sa répartition), par analyse du polymorphisme de la longueur des fragments de restriction de l'ADN mitochondrial amplifiés par la réaction de polymérisation en chaîne. L'analyse a mis en lumière des divergences génétiques importantes entre les populations des deux régions. Une analyse de la variance moléculaire a démontré que les valeurs de ΦST d'échantillons d'un même système hydrographique sont plus élevées dans le district de Tohoku que dans l'île d'Hokkaido. Il y a hétérogénéité dans la composition des haplotypes d'une population à l'autre et il se forme des groupes distinctifs dans le système hydrographique du district de Tohoku. Cottus nazawae a une répartition contagieuse dans les ruisseaux d'amont dans le district de Tohoku et est peut-être isolé thermiquement. En conséquence, il semble y avoir peu de flux de gènes d'une région à l'autre et la divergence est attribuable à la dérive génétique aléatoire et à la petite taille des populations effectives.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: May 1, 2002

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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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nrc/cjz/2002/00000080/00000005/art00010
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