FIG. 1.—
A cartoon schematic of the demographic models estimated for D. miranda and D. pseudoobscura. The demographic history of D. miranda is characterized by a severe bottleneck, while D. pseudoobscura is inferred to have had a relatively long-term stable population size, followed be recent growth. Thus, while the recent demographic history has served to exaggerate differences in size, the ancestral population size after the split of the two species may have been similar. T1 and T2 are the estimated times of the population size changes in 4N generations, and F1 and F2 are the changes in population size associated with the event (where F is the population size fraction relative to the ancestral size). The vertical black dotted line indicates the present time of sampling (i.e., t = 0).