Individual heterogeneity in reproductive rates and cost of reproduction in a long-lived vertebrate.
Individual heterogeneity in reproductive rates and cost of reproduction in a long-lived vertebrate.
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DOI：
10.1002/ece3.615
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发表时间：
2013-07
影响因子：
2.6
通讯作者：
Garrott, Robert A.
中科院分区：
文献类型：
--
作者：
Chambert, Thierry;Rotella, Jay J.;Higgs, Megan D.;Garrott, Robert A.
关键词：
繁殖成功的个体差异是进化的一个关键特征，但也对预测种群对可变环境的反应具有重要意义。尽管在许多研究中已经报道了生殖结果的个体差异，但迄今为止的大多数分析都没有考虑这些实现的差异是否是由于生殖中潜在的个体异质性或仅仅是随机机会导致相似个体之间的不同结果。此外，潜在的异质性在健身组件可能会表达不同的对比环境条件下，很少被调查的问题。在这里，我们评估了（一）潜在的个体异质性的潜在存在和（二）其表达的性质（固定与可变）在一个人口的女性威德尔海豹（Leptonychotes weddellii），使用分层建模方法的30年的标记-再捕获数据集组成的954个人遇到的历史。我们发现了强有力的支持存在潜在的个体异质性的人口，与“强大”的个人预计将产生两倍的幼崽“虚弱”的个人。此外，个体异质性的表达似乎是一致的，只有轻微的证据表明，当环境条件恶劣时，它可能会被放大。最后，个体异质性的显式建模使我们能够检测到大量的繁殖成本，这在忽略异质性时并不明显。
Individual variation in reproductive success is a key feature of evolution, but also has important implications for predicting population responses to variable environments. Although such individual variation in reproductive outcomes has been reported in numerous studies, most analyses to date have not considered whether these realized differences were due to latent individual heterogeneity in reproduction or merely random chance causing different outcomes among like individuals. Furthermore, latent heterogeneity in fitness components might be expressed differently in contrasted environmental conditions, an issue that has only rarely been investigated. Here, we assessed (i) the potential existence of latent individual heterogeneity and (ii) the nature of its expression (fixed vs. variable) in a population of female Weddell seals (Leptonychotes weddellii), using a hierarchical modeling approach on a 30-year mark–recapture data set consisting of 954 individual encounter histories. We found strong support for the existence of latent individual heterogeneity in the population, with “robust” individuals expected to produce twice as many pups as “frail” individuals. Moreover, the expression of individual heterogeneity appeared consistent, with only mild evidence that it might be amplified when environmental conditions are severe. Finally, the explicit modeling of individual heterogeneity allowed us to detect a substantial cost of reproduction that was not evidenced when the heterogeneity was ignored.
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