Article

Environmental Biology of Fishes

, Volume 69, Issue 1, pp 37-50

Genetic Population Structure of Chum Salmon in the Pacific Rim Inferred from Mitochondrial DNA Sequence Variation

  • Shunpei SatoAffiliated withDivision of Biological Science, Graduate School of Science, Hokkaido University
  • , Hiroyuki KojimaAffiliated withGraduate School of Science and Engineering, Hokkaido Tokai University
  • , Junko AndoAffiliated withDivision of Biological Science, Graduate School of Science, Hokkaido University
  • , Hironori AndoAffiliated withDivision of Biological Science, Graduate School of Science, Hokkaido University
  • , Richard L. WilmotAffiliated withAuke Bay Laboratory, Alaska Fisheries Science Center, NOAA
  • , Lisa W. SeebAffiliated withAlaska Department of Fish and Game
  • , Vladimir EfremovAffiliated withRussian Academy of Science
  • , Larry LeClairAffiliated withWashington Department of Fish and Wildlife
  • , Wally BuchholzAffiliated withU.S. Fish and Wildlife Service
    • , Deuk-Hee JinAffiliated withKangnung National University
    • , Shigehiko UrawaAffiliated withSalmon Resources Center
    • , Masahide KaeriyamaAffiliated withGraduate School of Science and Engineering, Hokkaido Tokai University
    • , Akihisa UranoAffiliated withDivision of Biological Science, Graduate School of Science, Hokkaido UniversityField Science Center, Hokkaido University
    • , Syuiti AbeAffiliated withDivision of Biological Science, Graduate School of Science, Hokkaido UniversityLaboratory of Animal Cytogenetics, Center for Advanced Science and Technology, Hokkaido UniversityLaboratory of Breeding Science, Graduate School of Fisheries Sciences, Hokkaido University

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Abstract

We examined the genetic population structure of chum salmon, Oncorhynchus keta, in the Pacific Rim using mitochondrial (mt) DNA analysis. Nucleotide sequence analysis of about 500 bp in the variable portion of the 5′ end of the mtDNA control region revealed 20 variable nucleotide sites, which defined 30 haplotypes of three genealogical clades (A, B, and C), in more than 2,100 individuals of 48 populations from Japan (16), Korea (1), Russia (10), and North America (21 from Alaska, British Columbia, and Washington). The observed haplotypes were mostly associated with geographic regions, in that clade A and C haplotypes characterized Asian populations and clade B haplotypes distinguished North American populations. The haplotype diversity was highest in the Japanese populations, suggesting a greater genetic variation in the populations of Japan than those of Russia and North America. The analysis of molecular variance and contingency χ2 tests demonstrated strong structuring among the three geographic groups of populations and weak to moderate structuring within Japanese and North American populations. These results suggest that the observed geographic pattern might be influenced primarily by historic expansions or colonizations and secondarily by low or restricted gene flow between local groups within regions. In addition to the analysis of population structure, mtDNA data may be useful for constructing a baseline for stock identification of mixed populations of high seas chum salmon.

mtDNA control region Pacific salmon haplotype genealogy genetic divergence