Figure 5

Variations in mean population genetic values at different latitudes and at different generations. The value for each latitude is the average of the five mean genetic values for the populations concerned. Latitudinal means were computed and reported for two levels of environmental cline and three different strengths of assortative mating. All simulations were conducted under the island migration model with moderate gene flow (Nm = 5.1). The red line indicates strong assortative mating (ρ=0.8), the blue line moderate assortative mating (ρ = 0.3), and the black line random mating (ρ = 0). The dashed line depicts the mean genetic value obtained under divergent selection modeled with ω² = 5 and ${\sigma }_{Z_{\text{opt}}}^2=5$ and without assortative mating. Each line represents the mean of 50 independent replicates for each evolutionary scenario.