Initial reactivity and magnitude of the acute stress response associated with personality in wild great tits (Parus major)
Initial reactivity and magnitude of the acute stress response associated with personality in wild great tits (Parus major)
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DOI：
10.1016/j.ygcen.2013.04.030
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发表时间：
2013-08-01
影响因子：
2.7
通讯作者：
Hau, Michaela
中科院分区：
文献类型：
--
作者：
Baugh, Alexander T.;van Oers, Kees;Hau, Michaela
表型相关，如功能不同的行为性状之间的相关，可以通过选择对个体性状、性状组合和多效性机制的作用而出现。已知类固醇激素对一系列行为和生理特征具有多效性效应，包括应对压力的稳定个体差异。然而，表征与人格有关的压力轴通常集中在估计糖皮质激素的基线和峰值水平上，主要是在圈养动物中。相比之下，应激反应的反应性如何迅速开启和持续可能更好地表明一个人科普挑战的能力，特别是在自由生活的动物中。使用野生大山雀（山雀），我们测试的假设，谨慎的个人响应一个标准化的压力与更大胆的个人相比，一个反应性的压力反应。野生鸟类被捕获，并在一个新的环境中进行探索行为测试，这是对该物种个性的一种操作性测量，并单独评估它们对标准化压力源的糖皮质激素反应。在捕获后的前三分钟内，较慢的探索者表现出糖皮质激素水平的更大升高。此外，探索速度较慢的人在压力源期间达到了更高的最大CORT浓度，并且糖皮质激素的总暴露量也更高。这些数据提供的证据表明，内分泌应激反应的时间反应性，特别是其速度和幅度，与自由生活的动物的稳定行为特征。(C)2013 Elsevier Inc. All rights reserved.
Phenotypic correlations, such as those between functionally distinct behavioral traits, can emerge through the action of selection on individual traits, on trait combinations, and through pleiotropic mechanisms. Steroid hormones are known to have pleiotropic effects on a suite of behavioral and physiological traits, including stable individual differences in coping with stress. Characterizing the stress axis in relation to personality, however, has typically focused on estimating baseline and peak levels of glucocorticoids, principally in captive animals. In contrast, the reactivity of the stress response how quickly it turns on and persists may better indicate the ability of an individual to cope with challenges, particularly in free-living animals. Using wild great tits (Parus major) we tested the hypothesis that cautious individuals respond to a standardized stressor with a more reactive stress response compared to bolder individuals. Wild birds were captured and tested for exploration behavior in a novel environment an operational measure of personality in this species and assessed separately for their glucocorticoid response to a standardized stressor. Slower explorers exhibited a greater elevation in glucocorticoid levels within the first three minutes after capture. Further, slower explorers reached a higher maximum CORT concentration and had higher total exposure to glucocorticoids during the stressor period. These data provide evidence that the temporal reactivity of the endocrine stress response, specifically its speed and magnitude, is associated with stable behavioral traits in free-living animals. (C) 2013 Elsevier Inc. All rights reserved.