Sexual Selection in a Wild Population of the Butterfly Danaus chrysippus L.
Danaus chrysippus has two common forms, chrysippus and dorippus, in east Africa. Form chrysippus males have a mating advantage lasting 3 to 4 months, which is lost as their frequency increases. Female dorippus are normally superior to female chrysippus in sexual vigor. Sexual selection favoring different morphs in each sex contributes to the maintenance of the polymorphism.
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