Integrated study on the formation ofthe freshwater fish fauna in western Japan based on a large molecular data set

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This study examined the formation of the strictly freshwater fish fauna in western Japan using a large genetic data set. A comparative phylogeographic/phylogenetic analysis of over 20 species revealed several major patterns in their population structures and led to a new understanding of the origin of the Lake Biwa endemic fauna. Based on ecological niche modeling, the potential distribution patterns of fish and their changes were inferred for presumed maximum regression and transgression periods. The phylogeographic patterns under natural/artificial secondary contact were clarified empirically in several cases, giving important insights into the dynamic distribution processes of freshwater fishes in western Japan.