Colony-specific differences in decadal longitudinal body composition of a capital-breeding marine top predator
Colony-specific differences in decadal longitudinal body composition of a capital-breeding marine top predator
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资本繁殖海洋顶级捕食者十年纵向身体组成的群体特异性差异
DOI：
10.1002/aqc.3093
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Hanson N
中科院分区：
文献类型：
--
作者：
Hanson N
主要繁殖动物，如真海豹（海豹科），依靠积累的身体储备来养育后代。在繁殖期开始时，母亲的身体组成可能取决于最近的环境条件，并为繁殖期提供资源。（Halichoerus grypus）繁殖群体与对比人口统计学特征，影响个体变异的因素和身体组成的时间趋势（以脂质与蛋白质质量比表示）。母体生殖支出以及对母体及其幼崽的影响，产后产妇身体成分的个体差异是相当大的。通过氢同位素稀释法估计27%（±5%）脂质和18%（±1%）蛋白质的平均值。没有发现年龄效应的证据。具有高脂质-蛋白质质量比的母亲消耗了更高比例的脂质资源，保存了蛋白质，并在第二年返回更多的蛋白质。两个殖民地之间的平均母体产后身体组成相似，但时间模式在一个殖民地不同，其中一个殖民地的幼崽产量下降，另一个殖民地的幼崽产量增加。在不断下降的殖民地的母亲断奶较大的幼崽比母亲在不断增加的殖民地在整个范围内的母亲的大小，但母体组成的措施并没有预测幼崽断奶群众。
Capital breeding animals such as true seals (Phocidae) rely on accumulated body reserves to rear offspring. A mother's body composition at the start of a breeding episode may depend on recent environmental conditions and sets the resources available for the reproductive episode.At two grey seal (Halichoerus grypus) breeding colonies with contrasting demographic characteristics, factors influencing individual variation and temporal trends in the body composition (expressed as the lipid‐to‐protein mass ratio) of females were examined.Maternal reproductive expenditure, and the consequences for mothers and their pups, were investigated.Individual variation in postpartum maternal body composition was considerable. Mean values of 27% (±5%) lipid and 18% (±1%) protein were estimated by hydrogen isotope dilution. No evidence of age effects was detected.Mothers with a high lipid‐to‐protein mass ratio expended a higher proportion of lipid resources, conserved protein and returned with more protein the following year.Average maternal postpartum body composition was similar between the two colonies, but temporal patterns differed at one colony where pup production was decreasing from another where pup production was increasing. Mothers at the declining colony consistently weaned larger pups than mothers at the increasing colony across the range of mother sizes, but measures of maternal body composition did not predict pup weaning masses.