Figure 1.
Map illustrating locations of the 61 ponds from which genetic samples were collected. The open squares contributed only Rana temporaria; open triangles only Triturus alpestris; filled circles both species. Rivers are indicated by lines, and lakes are hatched. The inset indicates the location of the study area within Switzerland. In some cases, ponds are so close together that their symbols cannot be distinguished; therefore, exact locations of all ponds are given in Table S1.