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首页> 外文期刊>Oecologia >Sex and migratory strategy influence corticosterone levels in winter-grown feathers, with positive breeding effects in a migratory pelagic seabird
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Sex and migratory strategy influence corticosterone levels in winter-grown feathers, with positive breeding effects in a migratory pelagic seabird

机译：性别和迁徙策略影响冬季生长的羽毛中的皮质酮水平，对迁徙的远洋海鸟具有积极的育种作用

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摘要

To overcome unpredictable stressful transitory events, animals trigger an allostatic response involving the hypothalamic-pituitary-adrenal cortex. This hormonal response, which involves the release of glucocorticoids which in turn mediate between the main physiological mechanisms that regulate the energetic demands and resource allocation trade-off with behavioural responses to environmental perturbations and may ultimately lead to variation in fitness. We have used the Cory's shearwater Calonectris borealis, a sexually dimorphic pelagic seabird with a partial migratory strategy, as a model bird species to analyse a number of traits related to the stress response. We investigated whether the activation of a stressful response, mediated by corticosterone, during the wintering period (1) correlated with the previous breeding success, (2) was affected by the migratory behaviour of male birds and (3) had consequences in the fitness of the birds. Corticosterone levels in feathers grown overwinter were analysed in 61 adult birds during three consecutive migratory periods (2009-2012) and in 14 immature birds in the wintering period 2010-2011. Moreover, the levels of corticosterone were analysed in experimental birds which were freed from their reproductive duties and compared with control birds which raised fledglings to the end of the breeding period. The results show that the levels of corticosterone were sex dependent, differed between years and were affected by the migratory strategy performed by the birds. The activation of the stressful response over the wintering period generated residual carry-over effects that positively affected the reproductive output in the subsequent breeding stage, a phenomenon previously undescribed in a long-lived pelagic seabird. Our study provides evidence that the analysis of corticosterone from feathers is a useful tool to evaluate carry-over effects in birds far away from breeding sites, opening new possibilities for future studies in this field.
机译：为了克服不可预测的应激性短暂事件，动物触发涉及下丘脑-垂体-肾上腺皮质的异体反应。这种激素反应涉及糖皮质激素的释放，而糖皮质激素又在调节能量需求的主要生理机制和资源分配与环境扰动的行为反应之间进行介导，并最终导致适应性变化。我们已经使用科里的water水Calonectrisborealis（一种具有部分迁徙策略的性二形中上层海鸟）作为模型鸟类来分析与压力反应有关的许多性状。我们调查了冬季期间（1）与先前的繁殖成功相关的皮质激素介导的应激反应的激活，（2）受雄鸟的迁徙行为的影响，（3）对雄性鸟类适应性的影响那些鸟儿。在连续三个迁徙期（2009-2012年）内对61只成年鸟的羽毛进行了分析，并在2010-2011年越冬期间对14只未成年鸟的羽毛进行了分析。此外，分析了没有繁殖能力的实验鸟的皮质酮水平，并与饲养雏鸟直至繁殖期结束的对照鸟进行了比较。结果表明，皮质类固醇的水平是性别依赖性的，不同年份之间存在差异，并且受鸟类的迁徙策略影响。在越冬期间，应激反应的激活产生了残留的残留效应，对后续繁殖阶段的繁殖产量产生积极影响，这种现象以前在长寿命的中上层海鸟中没有发生过。我们的研究提供的证据表明，对羽毛中的皮质酮的分析是评估远离繁殖地点的鸟类的残留效应的有用工具，为该领域的未来研究提供了新的可能性。

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