FIGURE 1.

Variation in lateral plate number among Japanese threespine stickleback populations. (a) Sampling sites of freshwater stickleback populations in Japan. The map is based on the Digital Map published by the Geospatial Information Authority of Japan. New habitats analyzed in this study are indicated by asterisks. (b) Violin plot of plate numbers. For the abbreviations of habitats, see (a). Data from one anadromous population from Akkeshi Bay and one brackish‐water resident population from Hyotan Pond published in Kitano et al. (2007) are also plotted for reference.