Corticosterone and timing of migratory departure in a songbird
Corticosterone and timing of migratory departure in a songbird
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DOI：
10.1098/rspb.2016.2300
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发表时间：
2017-01-11
影响因子：
4.7
通讯作者：
Schmaljohann, Heiko
中科院分区：
文献类型：
--
作者：
Eikenaar, Cas;Mueller, Florian;Schmaljohann, Heiko
鸟类迁徙需要在中途停留地点补充燃料储备。在那里，个人每天都会决定是否恢复移民，还必须决定离开的时间。出发时间的变化会影响完成迁徙旅程所需的总时间，这反过来又会通过到达繁殖和越冬地的时间来影响健康。众所周知，中途离开的决定是基于内在节奏、内在因素和外在因素的提示。然而，几乎对将这些暗示与离开决定联系在一起的生理机制(S)一无所知。在这里，我们展示了一种夜间迁徙的鸣禽，北方小麦鸟(Oenanthe Oenanthe)，在迁徙季节和在风的帮助下，鸟类在中途停留的皮质酮水平都会增加。皮质酮反过来预测离开的可能性；基线皮质酮水平高的人更有可能在给定的夜晚恢复迁徙。皮质酮进一步预测夜间出发时间，高基线水平与提前出发有关。这些新的发现表明，皮质酮可能在离开提示和离开中途停留地点的时间之间起调节作用，这是理解动物迁徙的激素控制的重要一步。
Bird migration entails replenishing fuel stores at stopover sites. There, individuals make daily decisions whether to resume migration, and must also decide their time of departure. Variation in departure timing affects the total time required to complete a migratory journey, which in turn affects fitness through arrival time at the breeding and wintering grounds. It is well established that stopover departure decisions are based on cues from innate rhythms, intrinsic factors and extrinsic factors. Yet, virtually nothing is known about the physiological mechanism(s) linking these cues to departure decisions. Here, we show for a nocturnal migratory songbird, the northern wheatear (Oenanthe oenanthe), that baseline corticosterone levels of birds at stopover increased both over the migratory season and with wind assistance towards the migratory destination. Corticosterone in turn predicted departure probability; individuals with high baseline corticosterone levels were more likely to resume migration on a given night. Corticosterone further predicted the departure time within the night, with high baseline levels being associated with early departures. These novel findings indicate that corticosterone may be mediating between departure cues and the timing of departure from a stopover site, which is a major step towards understanding the hormonal control of animal migration.