Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Distribution of native and non-native lineages of Misgurnus anguillicaudatus in Osaka Prefecture, Japan and development of morphological identification for each lineage.

Abstract

The weather loach Misgurnus anguillicaudatus in Japanese water is composed of three major Clades based on mitochondrial and nuclear DNA. and Clade .A and B-1 are known as Japanese names while Clade B-2 is known as a non-native lineage introduced from the Chinese continent. In this study. we investigated distribution of genetic lineages in Osaka Prefecture and determined morphological differences between Clades. Based un morphological differences. we also judged the lineage of specimens collected previously and then inferred previous change of distribution of lineages. We showed that Clade B-1 and B-2 are distributed in Osaka Prefecture and that individuals of Clade B-1 were laud locally, while those of Clade B-2 were distributed widely. It is likely that pure native populations composed of only B-1 individuals survive in a very limited area of northern Osaka and that they are endangered. although they were originally distributed widely in the Prefecture.