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Polyandrous females provide sons with more competitive sperm : Support for the sexy-sperm hypothesis in the rattlebox moth (Utetheisa ornatrix) [Evolution]

Keywords : Lepidoptera, paternity, polyandry, sexual selection, sperm competition

par Frédéric Magné - publié le

Given the costs of multiple-mating, why has female polyandry evolved ? Utetheisa ornatrix moths are well-suited for studying multiple mating in females because females are highly polyandrous over their lifespan, with each male mate transferring a substantial spermatophore with both genetic and non-genetic material. The accumulation of resources might explain the prevalence of polyandry in this species, but another, not mutually-exclusive, possibility is that females mate multiply to increase the probability that their sons will inherit more-competitive sperm.(...)

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