Fig. 3.

Results of the test for isolation-by-distance (IBD) among groups using Mantel tests on matrices of genetic and geographic distances with IBD v.1.52 (Bohonak 2002; http://www.bio.sdsu.edu/pub/andy/IBD.html). We used linearized FST-values calculated as FST/(1-FST) and logarithmic geographic distance matrices based on the minimum overland Euclidean distances between each pair of sampling sites (dots) estimated using Google Earth for the test for IBD. The correlation was run with 100,000 randomizations (Z = 0.6576). To visualize the distance, we give kilometers as units for physical on the x-axis.