Fig. 6.

Allele frequency changes over time at the Eda locus after colonization of a freshwater lake by marine fish in the 1980s. (A) Loberg Lake. (B) Observed frequency change of the low-armor Eda allele (points) compared with the predicted frequency (dotted line) from the fitted model with a selection coefficient estimated as s = 0.49 ± 0.05 SE. (C) Pairwise F_st between the earliest sample in 1992 and subsequent samples to 2008. Significantly faster differentiation over time is observed at Eda (filled circles), than at three putatively neutral microsatellite loci (Stn60, Stn239, and Stn277; open symbols). The two figures use different year spans.