Figure 4

Heat map showing pairwise population differentiation through estimation of fixation index (FST) between combined “shallow” (10 m and 16 m) and “deep” (25 m and 35 m) populations. Values within cells are estimated FST; intensity of red coloration corresponds with increasing FST; bolded values denote significant differentiation between populations (after FDR correction; α = 0.05). Site abbreviations listed in Table 2.