Genetic structure of land-locked ayu within the Biwa Lake system.
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Accession number;02A0246672
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| Title;Genetic structure of land-locked ayu within the Biwa Lake system. |
| Author;
IGUCHI K
(National Res. Inst. Fisheries Sci., Nagano, Jpn)
OHKAWA T
(Kyoto Univ., Kyoto, Jpn)
NISHIDA M
(Univ. Tokyo, Tokyo, Jpn)
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Journal Title;Fish Sci
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Journal Code:L2029A
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ISSN:0919-9268
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VOL.68;NO.1;PAGE.138-143(2002)
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| Figure&Table&Reference;FIG.3, TBL.3, REF.38 |
| Pub. Country;Japan |
| Language;English |
| Abstract;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. (author abst.) |
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