Genetic Differentiation in Populations of the Ryukyu-ayu Plecoglossus altivelis ryukyuensis on Amami-oshima Island.

概要

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The Ryukyu-ayu, <I>Plecoglossus altivelis ryukyuensis</I>, currently occurs only on Amami-oshima Island, and is represented by geographically separated, amphidromous populations in the eastern and western parts of this island (Sumiyo Bay and Yakeuchi Bay areas, respectively). To examine the level of isolation between the populations in the two areas, ecological and genetic investigations were made. The occurrence of young fish ascending streams from the sea was determined by a survey throughout the island, there being no evidence of occurrence in streams in the region separating the above areas of distribution. Genetic examination of 28 loci using allozyme electrophoresis revealed considerable allele frequency differences (p<0.001) between the eastern and western populations at two loci. These results suggest that the two populations are substantially independent from each other with little gene flow via larval migration along the coast. The considerable genetic heterogeneity in <I>P. a. ryukyuensis</I> on Amami-oshima Island should be taken into account in future conservation procedures involving this endangered subspecies.
日本魚類学会の論文