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Litter sex ratio affects lifetime reproductive success of free-living female Alpine marmots Marmota marmota

机译:产仔性别比影响自由生活的雌性高山土拨鼠Marmota marmota的终生生殖成功

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摘要

In litter-bearing mammals, adult phenotype is inuenced during prenatal life by the sex of neighbouring foetuses. This phenomenon, found so far only in laboratory studies, may have ecological importance in nature. We present the rst evidence that litter sex ratio has consequences for lifetime reproductive success in mammals. Female Alpine marmots born in a male-biased litter, i.e. more likely to be located in utero next to male foetuses, are more likely to be dominant later in life – a prerequisite for reproduction in this species. We found no evidence for lower reproductive output of these females, a common cost of prenatal masculinization.
机译:在产仔的哺乳动物中,成年表型在产前生活中受邻近胎儿的性别影响。迄今为止仅在实验室研究中发现的这种现象在自然界中可能具有生态重要性。我们提供的第一个证据表明,同窝性别比对哺乳动物终生生殖成功具有影响。雌性高山土拨鼠出生于雄性带斜纹的窝中,即更有可能位于雄性胎儿旁边的子宫内,在生活的后期更有可能成为优势种-这是该物种繁殖的先决条件。我们没有发现降低这些女性生殖能力的证据,这是产前男性化的普遍代价。

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