Figure 4.

Latitudinal cline in Heterandria formosa allozyme genetic diversity. This linear regression model shows a strong negative relationship between allozymic genetic diversity (He) and latitude (P = 0.002). Black dots indicate genetic diversity of sites below 28°N latitude (dashed line; the temperate-tropical transition), with bioclimatic prediction above the logistic threshold in our Last Glacial Maximum model (Figure 3B), i.e. within the putative LGM refugium.

Bagley et al. BMC Evolutionary Biology 2013 13:223   doi:10.1186/1471-2148-13-223
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