Corticosterone and foraging behavior in a pelagic seabird
Corticosterone and foraging behavior in a pelagic seabird
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DOI：
10.1086/512585
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发表时间：
2007-05-01
影响因子：
1.6
通讯作者：
Chastel, Olivier
中科院分区：
文献类型：
--
作者：
Angelier, Frederic;Shaffer, Scott A.;Chastel, Olivier
由于内分泌机制被认为是介导对环境变化的行为反应，因此研究这些机制对于了解长寿海鸟如何根据对比环境条件调整其觅食决定以最大限度地提高其适应性至关重要。在这种情况下，激素皮质酮（CORT）值得特别关注，因为它与运动活动的主要联系。我们第一次研究了个体CORT水平和觅食成功和行为的测量之间的关系，使用卫星跟踪和血液采样从流浪信天翁（Diomedea exulans）之前（行程前CORT水平）和之后（行程后CORT水平）觅食旅行在潜伏期。血浆CORT水平下降后觅食之旅，和水平的posttrip CORT与个人觅食成功，计算为总质量增益超过觅食之旅。行前CORT水平与在海上度过的时间无关，但与每日旅行距离和海上最大航程呈正相关。在这项研究中，我们能够强调CORT水平对能量摄入变化的敏感性，我们首次表明，个体CORT水平可以通过觅食成功率的变化来解释。出行前CORT水平与每日行驶距离和最大行程之间的关系与出行前体重无关，这表明出行前CORT水平的轻微升高可能有助于自发活动。然而，由于觅食行为和出行前CORT水平可能会受到个体素质的影响，未来的实验研究，包括操纵CORT水平，需要测试CORT是否可以调解觅食的决定，根据觅食条件。
Because endocrine mechanisms are thought to mediate behavioral responses to changes in the environment, examining these mechanisms is essential for understanding how long-lived seabirds adjust their foraging decisions to contrasting environmental conditions in order to maximize their fitness. In this context, the hormone corticosterone (CORT) deserves specific attention because of its major connections with locomotor activities. We examined for the first time the relationships between individual CORT levels and measurements of foraging success and behavior using satellite tracking and blood sampling from wandering albatrosses (Diomedea exulans) before (pretrip CORT levels) and after (posttrip CORT levels) foraging trips during the incubation period. Plasma CORT levels decreased after a foraging trip, and the level of posttrip CORT was negatively correlated with individual foraging success, calculated as total mass gain over a foraging trip. Pretrip CORT levels were not linked to time spent at sea but were positively correlated with daily distance traveled and maximum range at sea. In this study, we were able to highlight the sensitivity of CORT levels to variation in energy intake, and we showed for the first time that individual CORT levels can be explained by variation in foraging success. Relationships between pretrip CORT levels and daily distance traveled and maximum range were independent of pretrip body mass, suggesting that slight elevations in pretrip CORT levels might facilitate locomotor activity. However, because both foraging behavior and pretrip CORT levels could be affected by individual quality, future experimental studies including manipulation of CORT levels are needed to test whether CORT can mediate foraging decisions according to foraging conditions.