Fig. 3. Maps and distributions of eDNA-based phylogenetic groups ofBarbatula toni: (a) map of the Japanese archipelago and Sakhalin; (b) distributions of eDNA-based phylogenetic groups of B. toni in Hokkaido. The different colors are described in the captions of Figs. 1 and 2 and proportions in the two-color circles indicate the haplotype frequencies in each phylogenetic group. The numbers are the IDs of the rivers from which the groups were extracted.