Evolutionary basis of intermale sexual behavior by multiple pheromone switches in <i>Drosophila</i>.

ABSTRACT: We have identified a Drosophila species which exhibits spontaneous and robust intermale sexual behavior. D. santomea males distinguish conspecific sexes but court both vigorously and seldom attack. Elevated intermale courtship stems from at least three evolutionarily derived pheromonal changes. In males, the sexually monomorphic cuticular pheromone 7-tricosene promotes rather than inhibits courtship and the courtship-inhibiting olfactory pheromone cVA is reduced 84-92% compared to close relatives. The third switch is in D. santomea females, where cVA suppresses rather than promotes sexual receptivity. Female cVA aversion and male cVA reduction may have co-evolved to maintain efficient intraspecific mating but prevent hybridization with the sympatric sibling species D

SUBMITTER: Ouadah Y 

PROVIDER: S-EPMC12632756 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature