Figure 2.

Trajectories of within- (h_s) and between-population (h_b) genetic diversities under cycles of isolation and connection in the domain P_W < P < P_I when initial genetic diversity h_b(0) is (a) low and (b) high. In (a), when h_b(0) is low, the successive peaks of within-population genetic diversity (grey arrows) increase in size, while in (b) they decrease in size. In both (a) and (b), the equilibrium trajectories of genetic diversity (framed by a rectangle) are the same. Parameters are M = 400, θ = 0.1 n = 4, N = 10 000, P = 50 000 generations.