Figure 5.

Alternative parameterizations (top and centre, main text) centred around the Makassar Strait (M) suggest no gene flow between Sulawesi and Borneo after colonization of Sulawesi and identify distinctive patterns of population structure in the X and autosomes of M. nemestrina (bottom). An excess of shared derived sites in P₂ and P₃ (red double-headed arrows, top and centre) makes Patterson's D positive, whereas an excess of these sites between P₁ and P₃ (black double-headed arrows) makes Patterson's D negative. Dotted branches indicate an ancestry component shared between Sulawesi, the Sumatra sample and some Borneo samples (all but PM665) in the autosomes, and between Sulawesi and all Borneo samples in the X. Here, for parameterization 1, Sulawesi 1 includes the three species from the northern peninsula and Sulawesi 2 includes the other species from the rest of Sulawesi. Results are similar with other combinations of individual Sulawesi species (electronic supplementary material, figure S10). (Online version in colour.)