Fig. 1From: Testing the devil’s impact on southern Baltic and North Sea basins whitefish (Coregonus spp.) diversityGeographical map of Europe, showing the sampling locations of 15 contemporary and 2 historical whitefish populations, accumulated into nine groups of origin (O1-O9, upper panel), and locations of population origin in northern Germany (lower panel). Lake-resident populations are indicated by circles, whereas anadromous populations are indicated by diamonds. Historical lake populations are indicated by squares and historical anadromous population by triangles. For details of populations, see Table 1Back to article page