Table 1: Premating isolation IPSI between intraspecific (homotypic) and interspecific (heterotypic) strains ofD. w. willistoni and D. w. winge as well as interspecific mating asymmetry (IAPSI(AB/BA). S= Saint Vincent; U= Uruguay; G= Guadeloupe; P= Puerto Rico. P‐values were determined by bootstrapping 10,000 times. *P < 0.05; **P < 0.01; ***P < 0.001.