高度侵入性哺乳动物后代性别比例和母体分配的差异,Ecology and Evolution

当前位置： X-MOL 学术 › Ecol. Evol. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

高度侵入性哺乳动物后代性别比例和母体分配的差异
Ecology and Evolution ( IF 2.6 ) Pub Date : 2023-05-25 , DOI: 10.1002/ece3.10136
Sarah M Chinn ₁ , Timothy Smyser ₂ , James C Beasley ₁

Affiliation

出生时的性别比例偏斜在野生种群中被广泛报道，然而，父母能够在多大程度上调节后代的性别比例以最大限度地提高自身适应度仍不清楚。对于高度多胎的物种尤其如此，因为最大化适应性可能包括性别比例与窝中后代的大小和数量之间的权衡。在这种情况下，母亲可能会调整每窝后代的数量和后代性别，以最大限度地提高个体适应性。调查野猪（Sus scrofa ）的母性性别分配) 在随机环境条件下，我们预测在有利条件下，高质量的母亲（更大和更老）会产生偏向雄性的窝，并投入更多来生产更多雄性的大窝。我们还预测性别比例会随着窝产仔数的变化而变化，在较小的产仔中会出现雄性偏差。我们发现有证据表明，增加野猪血统、母亲年龄和状况以及资源可用性可能对性别比例偏向男性的影响微弱，但是，本研究中未测量的未知因素被认为具有更大的影响力。优质母亲将更多资源分配给产仔数，但这种关系是由产仔数而非性别比例的调整驱动的。性别比和产仔数之间没有关系。总的来说，

"点击查看英文标题和摘要"

Variance in offspring sex ratio and maternal allocation in a highly invasive mammal

Skewed sex ratios at birth are widely reported in wild populations, however, the extent to which parents are able to modulate the sex ratio of offspring to maximize their own fitness remains unclear. This is particularly true for highly polytocous species as maximizing fitness may include trade-offs between sex ratio and the size and number of offspring in litters. In such cases, it may be adaptive for mothers to adjust both the number of offspring per litter and offspring sex to maximize individual fitness. Investigating maternal sex allocation in wild pigs (Sus scrofa) under stochastic environmental conditions, we predicted that under favorable conditions, high-quality mothers (larger and older) would produce male-biased litters and invest more in producing larger litters with more males. We also predicted sex ratio would vary relative to litter size, with a male-bias among smaller litters. We found evidence that increasing wild boar ancestry, maternal age and condition, and resource availability may weakly contribute to male-biased sex ratio, however, unknown factors not measured in this study are assumed to be more influential. High-quality mothers allocated more resources to litter production, but this relationship was driven by adjustment of litter size, not sex ratio. There was no relationship between sex ratio and litter size. Collectively, our results emphasized that adjustment of litter size appeared to be the primary reproductive characteristic manipulated in wild pigs to increase fitness rather than adjustment of offspring sex ratio.

更新日期：2023-05-27

点击分享查看原文

点击收藏

公开下载

阅读更多本刊最新论文本刊介绍/投稿指南

全部期刊列表>>