Progress in analyzing fish population structure in ayu [Plecoglossus altivelis] with today's significance
2006
Iguchi, K.(National Research Inst. of Fisheries Science, Ueda, Nagano (Japan). Freshwater Fisheries Lab.) | Takeshima, H.
Studies on population structure of ayu (Plecoglossus altivelis) were reviewed to evaluate the present status of our task concerning genetic structure of the species. More detailed description has been allowed according to the technical progress in analysis. At first, phenotypic markers including morphological, ecological and behavioural characteristics were successful in distinguishing landlocked Lake Biwa form from amphidromuos form. Allozyme analysis was used to describe new subspecies as P. a. ryukyuensis, and provided genetic basis on the divergence of landlocked Lake Biwa form. Mitochondrial DNA analysis observed metapopulational structure between insular and mainland local populations, while genetic structure within a Japan's amphidromous form was remained suggestive but unclear. Our study proved effectiveness of microsatellite DNA as a genetic marker, and successfully detected genetic structure within a Japan's amphidromous form. Application of microsatellite DNA can contribute to establish conservation unit and/or resource management unit.
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