Genetic variations ofCottus nozawae populations from five tributaries of the Shiribetsu River of southern Hokkaido,Japan |
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| Authors: | Naohiko Okumura Yutaka Hasebe Akira Goto |
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| Institution: | (1) Laboratory of Embryology and Genetics, Faculty of Fisheries, Hokkaido University, 3-1-1 Minato-cho, Hakodate, 041 Hokkaido, Japan;(2) Present address: Department of Bioresource Chemistry, Obihiro University of Agricuture and Veterinary Medicine, Inada-cho, Obihiro, 080 Hokkaido, Japan |
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| Abstract: | To estimate genetic differentiation and heterogeneity in the landlocked river sculpin,Cottus nozawae, between tributary populations in the same river-system, 107 specimens were captured from 5 tributaries of the Shiribetsu
river (course length 128 km), Hokkaido Island and surveyed for allozyme variations and restriction fragment length polymorphisms
of mitochondrial DNA (mtDNA). Three and two alleles were seen at theIdh-2 andPgm loci, respectively, but only one locus,Idh-2, out of twenty loci examined was regarded as polymorphic, since the frequency of the most common allele did not exceed 0.95.
Three different mtDNA haplotypes were detected, there being replacement of them between the tributary populations. Heterogeneities
of allele and haplotype frequencies were significant between some tributary populations, suggesting that genetic differentiation
has occurred between them. |
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| Keywords: | Cottus nozawae allozyme variations restriction fragment length polymorphisms tributary populations |
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