Data from: Persistence of an extreme male-biased adult sex ratio in a natural population of polyandrous bird

András Kosztolányi, Zoltan Barta, Clemens Küpper & Tamás Székely
In a number of insects, fishes and birds the conventional sex roles are reversed: males are the main care provider whereas females focus on matings. The reversal of typical sex roles is an evolutionary puzzle, because it challenges the foundations of sex roles, sexual selection and parental investment theory. Recent theoretical models predict that biased parental care may be a response to biased adult sex ratios (ASRs). However, estimating ASR is challenging in natural populations,...

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