Figure 1.

Trajectories of within- (h_s) and between-population (h_b) genetic diversities under cycles of isolation and connection: (a) in the long-period domain P > P_I and (b) in the short-period domain P < P_W. The dashed and dotted lines represent the expected equilibrium value when populations are connected and isolated, respectively. In (a), both h_s and h_b reach their expected equilibrium value at the end of each connection and isolation period. In (b), both h_s and h_b tend to their equilibrium value of connection (dashed line) with very small fluctuations. Parameters are M = 40, n = 10, N = 2 000, μ = 2.5 × 10⁻⁵. (a) P = 60 000, (b) P = 150.