Figure 3.
The stable switching rate when selection strengths vary temporally. (a) The selection coefficients are s1 = s3 = 0.4 and s2 = s4 with the difference in selection pressure (s1 − s2) presented in the legend. The expected environmental period is 10 generations in the both demes. The environmental variability parameter ψ is equal to 0.1. (b) The selection coefficients are s1 = s3 = 0.4 and s2 = s4 = 0.1. The expected environmental period is 10 generations in the both demes, and the colours correspond to different levels of environmental variability ψ. Environmental variability ψ = 0 corresponds to the periodic case of an environmental switch every 10 generations. Environmental variability ψ = 1 represents the case where both environments change with an exponential waiting time of 10 generations. The plotted curves are fitted to the data using a generalized additive model with penalized cubic regression splines.