Genetic structure of land-locked ayu within the Biwa Lake system.

• IGUCHI KEI'ICHIRO

  Freshwater Fisheries and Environmental Division, National Research institute of Fisheries Science

• OHKAWA TOSHIYUKI

  Graduate School of Agriculture, Kyoto University

• NISHIDA MUTSUMI

  Ocean Research Institute, University of Tokyo

抄録

Landlocked ayu stocks in the Biwa Lake system were investigated using a mitochondrial DNA marker to evaluate their genetic structure. Samples examined consisted of spring migrants (o-ayu), fall migrants (ko-ayu), and juvenile residents in the lake at a predifferentiated stage. Compared to amphidromous fish, the landlocked fish, overall, were characterized by a lower genetic diversity that has resulted from lower haplotype diversity and a higher similarity in nucleotide sequences between haplotypes. Some nucleotide diversities that were unique to the samples showed that the landlocked ayu are not genetically homogeneous, suggesting the occurrence of a single metapopulation throughout the Biwa Lake system. The pairwise fixation index inferred different respective local populations for the o-ayu and ko-ayu ascending the same stream in the same year class, as well as the isolation by distance among local populations of ko-ayu. For conservation practices during transplantation with fish from non-native stocks, it should be taken into account that the Biwa Lake stocks have a high probability of not being genetically uniform.

収録刊行物

• Ｆｉｓｈｅｒｉｅｓ　ｓｃｉｅｎｃｅ

  Ｆｉｓｈｅｒｉｅｓ　ｓｃｉｅｎｃｅ 68 (1), 138-143, 2002

  公益社団法人 日本水産学会

キーワード

• genetic structure
• Lake Biwa system
• landlocked stocks
• mitochondrial DNA
• Plecoglossus altivelis

詳細情報

• CRID: 1390001204429666432
• NII論文ID: 10008272386
• NII論文ID: 130003742405
• NII書誌ID: AA10993718
• DOI: 10.1046/j.1444-2906.2002.00399.x
• ISSN: 14442906
• ISSN: 09199268
• NDL書誌ID: 6060407
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I6060407
• 本文言語コード: en
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• 抄録ライセンスフラグ: 使用不可