Abstract:1. Sperm competition is extremely common in many species but conclusions about the relative successes of males, measured as the proportion of a female's offspring fertilised by the second male to mate with it, are based largely on laboratory studies using two laboratory‐bred males or on interrupted last copulations.
2. A study was conducted in which virgin female yellow dung flies Scathophaga stercoraria mated uninterrupted with two field‐captured males.
3. The results confirmed two previous conclusions: the p… Show more
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