Within-individual plasticity explains age-related decrease in stress response in a short-lived bird
Within-individual plasticity explains age-related decrease in stress response in a short-lived bird
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DOI：
10.1098/rsbl.2015.0272
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发表时间：
2015-07-01
期刊：
影响因子：
3.3
通讯作者：
Chastel, Olivier
中科院分区：
文献类型：
--
作者：
Lendvai, Adam Z.;Giraudeau, Mathieu;Chastel, Olivier
对于每一个有机体来说，一个至关重要的问题是如何在相互竞争的生活史组成部分之间分配能量。最优分配决策往往是状态依赖的，并由激素介导。在这里，我们调查了年龄，一个主要的状态变量如何影响个体对标准化压力源的激素反应：一种可能反映自我维持和生殖之间分配的特征。我们捕捉自由生活的家麻雀，并连续几年测量其激素（皮质酮）反应捕捉压力。使用长期的振铃数据集，我们确定了鸟类的年龄，并将变化划分为个体内和个体外年龄分量，以分别研究可塑性与选择或基因流对应激反应的影响。我们发现鸟类的激素分布存在很大的个体差异，但总体而言，随着年龄的增长，鸟类对捕获压力的反应不那么强烈。这些结果表明，压力反应是一种可塑性特征，可能会在个体内以适应性的方式变化，自然选择可能会作用于反应规范，在实际环境和生活史阶段产生最佳的表型反应。
A crucial problem for every organism is how to allocate energy between competing life-history components. The optimal allocation decision is often state-dependent and mediated by hormones. Here, we investigated how age, a major state variable affects individuals' hormonal response to a standardized stressor: a trait that may reflect allocation between self-maintenance and reproduction. We caught free-living house sparrows and measured their hormonal (corticosterone) response to capture stress in consecutive years. Using a long-term ringing dataset, we determined the age of the birds, and we partitioned the variation into within-and among-individual age components to investigate the effects of plasticity versus selection or gene flow, respectively, on the stress response. We found large among-individual variation in the birds' hormone profiles, but overall, birds responded less strongly to capture stress as they grew older. These results suggest that stress responsiveness is a plastic trait that may vary within individuals in an adaptive manner, and natural selection may act on the reaction norms producing optimal phenotypic response in the actual environment and life-history stage.