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Nest size and hatchling sex ratio in chinstrap penguins

机译:下巴企鹅的巢大小和孵化性别比

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Variation in the sex ratio at hatching in the chinstrap penguin Pygoscelis antarctica was investigated, using molecular sexing to test predictions of sex allocation theory. The sex ratio was slightly male-biased (0.54) but did not differ significantly from parity. The proportion of males increased with nest size, an estimator of parental quality in chinstrap penguins. High-quality parents were able to produce and rear a higher proportion of male offspring, the more costly sex in this slightly sexually dimorphic species. Our results may be in agreement with Trivers and Willard's (1973) argument on biases in the offspring sex ratio being contingent on parental condition or quality.
机译:调查了南极企鹅(Chingstrap penguin)的南极企鹅(Pygoscelis antarctica)孵化时性别比例的变化,使用分子性别鉴定来检验性别分配理论的预测。性别比例略有男性偏见(0.54),但与平价并无明显差异。雄性比例随着巢大小的增加而增加,巢大小是下巴企鹅的父母质量的估计值。高素质的父母能够繁殖和养育更高比例的雄性后代,而这种略带性别的双态物种的性交成本更高。我们的研究结果可能与Trivers和Willard(1973)关于后代性别比例偏差取决于父母状况或质量的观点相吻合。

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