Endocrine regulation of migratory departure from stopover: Evidence from a longitudinal migratory restlessness study on northern wheatears
Endocrine regulation of migratory departure from stopover: Evidence from a longitudinal migratory restlessness study on northern wheatears
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DOI：
10.1016/j.yhbeh.2018.01.008
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发表时间：
2018-03-01
影响因子：
3.5
通讯作者：
Stoewe, Mareike
中科院分区：
文献类型：
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作者：
Eikenaar, Cas;Mueller, Florian;Stoewe, Mareike
大多数候鸟都会中途停留以补充燃料储备。从中途停留地恢复迁徙的决定在很大程度上决定了迁徙的时间组织。众所周知，这一决定是由一系列内在和外在因素决定的，例如鸟类的燃料储存和当前的天气状况。然而，中途停留的出发是如何在生理上进行调节的仍然未知。我们在此提供的数据强烈表明，皮质酮（一种对运动具有刺激作用的激素）在燃料储存和中途停留之间发挥着中介作用。在中途停留的迁徙北方麦穗鸟（Oenanthe oenanthe）中，我们观察到燃料储存的变化与鸟类粪便中糖皮质激素代谢物（GCM）水平的同时变化之间存在正相关关系。我们还发现 GCM 水平的变化与夜间迁徙不安强度的变化之间存在正相关关系。由于在北方麦穗中，夜间迁徙的不安是中途停留可能性的准确代表，因此我们的结果表明，皮质酮在燃料储存和恢复迁徙的决定之间发挥着中介作用。我们独特的纵向研究代表了我们对鸟类迁徙内分泌调节的理解取得了相当大的进步。
Most migrating birds make stopovers to replenish fuel stores. The decision to resume migration from stopover to a large extent shapes the temporal organization of migration. This decision is known to be shaped by a suite of intrinsic and extrinsic factors such as the bird's fuel stores and current weather conditions. However, how departures from stopover are physiologically regulated is largely unknown. We here present data that strongly indicate that corticosterone, a hormone with a stimulatory effect on locomotion, acts as a mediator between fuel stores and departure from stopover. In migrating northern wheatears (Oenanthe oenanthe) temporarily caged at stopover, we observed a positive relationship between the change in fuel stores and the concurrent change in glucocorticoid metabolite (GCM) levels measured in the birds' droppings. We also found a positive relationship between the change in GCM levels and the change in the intensity of nocturnal migratory restlessness. As in northern wheatears nocturnal migratory restlessness is an accurate proxy for stopover departure likelihood, our results indicate that corticosterone mediates between fuel stores and the decision to resume migration. Our unique longitudinal study represents a considerable advance in our understanding of the endocrine regulation of avian migration.