Abstract:Two sympatric, distantly related Drosophila species, D. melanogaster and D. affinis have been shown to interact sexually. Mature D. melanogaster males perform vigorous courtship in response to both virgin and mated D. affinis females, but perform no courtship in response to virgin females of another sympatric species, D. immigrans. To determine whether inter-specific courtship might interfere with mating success and fitness, D. affinis females were used as 'interference sex objects' in tests where D. melanogas… Show more
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