Figure 2

Maps of the sampling sites and investigated regions. The solid black triangles in map (a) indicate the sampling sites of five introduced populations in Europe including LAN Langeoog, HUN Hundige, DRA Dragor, HEA Heatherhill, and SKA Skanor, the solid black dots in map (b) indicate the sampling sites of two native populations in China including MUP Muping and HCH Hunchun, and the two rectangles in map (c) show the two investigated regions in Eurasia.