Fig. 1: The Misty Lake and inlet stream stickleback system.

a Geographic situation of Misty Lake, its inlet stream, and the marsh located between these habitats (map created by the authors based on data from Google Earth). Sample sites along the lake-stream transition are indicated by orange dots (GPS coordinates and sample sizes given in Supplementary Table 1). b Representative lake and stream stickleback individuals of both sexes (Photo credit: Katja Räsänen).