Are assortative mating and genital divergence driven by reinforcement?

Since duration apparently influenced the success of mountings, we tested for an effect of location and found a highly significant male species × female species × location interaction (χ 2 = 18.89, df = 1, P = 0.00022), driven mainly by short interspecific matings in the sympatric, but not in the allopatric combinations (Fig. 1 A).

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