Sexual conflict and the evolution of genitalia: male damselflies remove more sperm when mating with a heterospecific female.

The female had no significant effect (F 1,79 = 2.34, p = 0.130), but there was a highly significant effect of the male × female interaction (F 1,79 = 9.52, p = 0.003), because interspecific matings were shorter.

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The duration of stage II was not significantly affected by male identity or the interaction (p > 0.209), although there was a marginally significant effect of female species (F 1,79 = 3.17, p = 0.079).

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