Differentiation along a segment of chromosome seven between the lake and stream stickleback population from the Constance (black) and Boot (gray) system. Sliding window analysis was performed by local polynomial fitting of FST values for data sets with the allele frequency threshold n set to one (all SNPs in the data sets considered; dotted lines), and n set to four (at least four copies of the minor allele required across the pooled lake and stream sample in each system; solid lines). Note the relatively flat differentiation profiles with n = 1.
Roesti et al. BMC Evolutionary Biology 2012 12:94 doi:10.1186/1471-2148-12-94