Sources of variation in maternal allocation in a long‐lived mammal,Journal of Animal Ecology

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Sources of variation in maternal allocation in a long‐lived mammal
Journal of Animal Ecology ( IF 3.5 ) Pub Date : 2020-06-29 , DOI: 10.1111/1365-2656.13243
Kaitlin R Macdonald ₁ , Jay J Rotella ₁ , Robert A Garrott ₁ , William A Link ₂

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Abstract Life history theory predicts allocation of energy to reproduction varies with maternal age, but additional maternal features may be important to the allocation of energy to reproduction. We aimed to characterize age‐specific variation in maternal allocation and assess the relationship between maternal allocation and other static and dynamic maternal features. Mass measurements of 531 mothers and pups were used with Bayesian hierarchical models to explain the relationship between diverse maternal attributes and both the proportion of mass allocated by Weddell seal mothers, and the efficiency of mass transfer from mother to pup during lactation as well as the weaning mass of pups. Our results demonstrated that maternal mass was strongly and positively associated with the relative reserves allocated by a mother and a pup's weaning mass but that the efficiency of mass transfer declines with maternal parturition mass. Birthdate was positively associated with proportion mass allocation and pup weaning mass, but mass transfer efficiency was predicted to be highest at the mean birthdate. The relative allocation of maternal reserves declined with maternal age but the efficiency of mass transfer to pups increases, suggestive of selective disappearance of poor‐quality mothers. These findings highlight the importance of considering multiple maternal features when assessing variation in maternal allocation.

中文翻译：

长寿哺乳动物母体分配变异的来源

摘要生活史理论预测，生殖能量分配随母亲年龄而变化，但额外的母亲特征可能对生殖能量分配很重要。我们旨在表征母亲分配中特定于年龄的变化，并评估母亲分配与其他静态和动态母亲特征之间的关系。使用贝叶斯分层模型对 531 只母海豹和幼崽进行的质量测量来解释不同母体属性与威德尔海豹母体分配的质量比例之间的关系，以及哺乳期和断奶期间从母体到幼崽的质量转移效率大量的幼崽。我们的研究结果表明，母体质量与母体和幼崽分配的相对储备呈强正相关。s 断奶量，但传质效率随产妇分娩量而下降。出生日期与比例质量分配和幼仔断奶质量呈正相关，但预计传质效率在平均出生日期最高。母体储备的相对分配随着母体年龄的增长而下降，但向幼崽转移的效率增加，表明劣质母体的选择性消失。这些发现强调了在评估母体分配变化时考虑多个母体特征的重要性。母体储备的相对分配随着母体年龄的增长而下降，但向幼崽转移的效率增加，表明劣质母体的选择性消失。这些发现强调了在评估母体分配变化时考虑多个母体特征的重要性。母体储备的相对分配随着母体年龄的增长而下降，但向幼崽转移的效率增加，表明劣质母体的选择性消失。这些发现强调了在评估母体分配变化时考虑多个母体特征的重要性。

更新日期：2020-06-29

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