Discovery of the Japanese rosy bitterling, <I>Rhodeus ocellatus kurumeus</I>, in Nara Prefecture
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概要
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The Japanese rosy bitterling (<I>Rhodeus ocellatus kurumeus</I>) is a cyprinid subspecies endemic to Japan. It is now on the verge of extinction due to hybridization with its subspecies <I>R. o. ocellatus</I>, introduced from mainland China. In this study, we examined 13 populations of <I>R. ocellatus</I> from Nara Prefecture, Japan, using morphological analysis and molecular analyses of mtDNA and microsatellites. One of the populations in Nara Park (Stn. 9) closely matched the morphological characteristics of <I>R. o. kurumeus</I>, while other populations more closely resembled <I>R. o. ocellatus.</I> The former population possessed mitotypes of <I>R. o. kurumeus</I> only, while the latter possessed those of both subspecies or those of <I>R. o. ocellatus</I> only. Notably, mitotypes of <I>R. o. kurumeus</I> were widely observed in the Nara Basin. In addition to the presence of mitotypes reported in an Osaka population of <I>R. o. kurumeus</I>, the low genetic diversity of the population at Stn. 9 was comparable to that of the Osaka <I>R. o. kurumeus</I> population. In a principal component analysis of microsatellites data, three clusters were recognized; 1. <I>R. o. kurumeus</I> (including the population at Stn. 9), 2. <I>R. o. ocellatus</I> and 3. their probable hybrids. These results suggest that <I>R. o. kurumeus</I> was once distributed widely in the middle reaches of the Yamato River, but the remaining populations have hybridized with <I>R. o. ocellatus</I>, except for the population at Stn. 9. Low genetic diversity in the Nara Park population is considered a result of a population bottleneck in a small isolated habitat.
- 日本魚類学会の論文
日本魚類学会 | 論文
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