Figure 3.

Estimated summer (A) and winter (B) survival of the fry released into the two natural lakes, CPH and PPH. Points represent the proportion of fish surviving from those released 20 July 2005. Letters indicate significant differences in survival among the genotypes (G-test, all P < 0.05). Strains are pure wild (W; 0% domesticated alleles), second-generation backcross (BC₂; 12.5% domesticated alleles), first-generation backcross (BC₁, 25% domesticated alleles), F₁ hybrid (F₁; 50% domesticated alleles) and pure domesticated (D; 100% domesticated alleles). The line connecting the D and W means indicates the a priori expectation of additive genetic effects; character means for all hybrids should fall on this line if divergence was because of genes with only additive effects.