Genetic differentiation between collections of hatchery and wild masu salmon (<Emphasis Type="Italic">Oncorhynchus masou</Emphasis>) inferred from mitochondrial and microsatellite DNA analyses |
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Authors: | Jeong-Nam Yu Noriko Azuma Syuiti Abe |
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Institution: | (1) Division of Marine Bioscience, Faculty and Graduate School of Fisheries Sciences, Hokkaido University, Hakodate 041–8611, Japan;(2) National Institute of Bioresource Research, Environmental Research Complex, Gyeongseo-dong, Seo-gu, Incheon-si, 404-708, South Korea;(3) Nodai Bioresource Institute, Tokyo University of Agriculture, Abashiri 099–2493, Japan; |
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Abstract: | There has been very little effort to understand genetic divergence between wild and hatchery populations of masu salmon (Oncorhynchus masou). In this study, we used mitochondrial (mt) NADH dehydrogenase subunit 5 gene (ND5) and six polymorphic nuclear microsatellite DNA loci to compare the genetic variability in three hatchery broodstocks of
masu salmon with the variability in eight putative wild masu populations sampled in five rivers including one known source
river for the hatchery broodstocks. Both ND5 and microsatellites showed no significant genetic divergence (based on FST estimates) between four annual collections from the source river population, suggesting no change in genetic diversity over
this time period. The FST estimates, an analysis of molecular variance (AMOVA), and a neighbor-joining tree using both DNA markers suggested significant
differentiation between the three hatchery and all eight putative wild populations. We conclude that genetic diversity of
hatchery populations are low relative to putative wild populations of masu salmon, and we discuss the implications for conservation
and fisheries management in Hokkaido. |
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