F st values obtained in pairwise comparisons among the sites were also low ( Table 3 ), although seven values were individually significant (six at P <0.01 and one at P <0.05) and a further seven approached significance (0.08< P <0.05).
Individually significant F st values were only found in pairwise comparisons involving Anchorage Island (Binomial proportions test, P <0.05) and this pattern became even stronger when marginally significant P -values (0.08< P <0.05) were taken into account (14/21 versus 0/15 for comparisons excluding Anchorage; Binomial proportions test, P = 0.0002).