Fig. 2. Migration and population divergence models tested in the present study using data from the Caribbean (CA; θ₁), East Atlantic (EA; θ₂) and Southwest Indian Ocean (SWO; θ₃).

(A) Model 1: an island model without divergence; (B) Model 2: CA and SWO diverged from EA; (C) Model 3: CA and EA diverged from SWO; (D) Model 4: EA and SWO diverged from CA. Arrows indicate migration. Differences in population-specific divergence times (τ_i) are for illustrative purposes; divergence time priors were parametrized similarly among populations (Supplementary Table S2).