Fuel accumulation advances nocturnal departure: a migratory restlessness study on northern wheatears at stopover
Fuel accumulation advances nocturnal departure: a migratory restlessness study on northern wheatears at stopover
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DOI：
10.1016/j.anbehav.2016.04.017
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发表时间：
2016-07-01
期刊：
影响因子：
2.5
通讯作者：
Schmaljohann, Heiko
中科院分区：
文献类型：
--
作者：
Eikenaar, Cas;Mueller, Florian;Schmaljohann, Heiko
迁徙的动物通常会中途停留休息，并补充以前旅行中使用的燃料。在鸟类中，肥胖或快速加油的个体通常比瘦或慢加油的鸟类更容易离开中途停留。然而，离开决定涉及的不仅仅是日常离开的可能性。此外，移徙者离开的夜间（或白天）时间也很重要，因为这在很大程度上决定了飞行时间的长短，从而影响到移徙的速度。由于中途停留是为了补充燃料储备，纵向数据是关于燃料储备和夜间起飞时间之间关系的最有价值的数据，但不存在这样的数据。为了填补这一空白，我们在一个春季中途停留点捕捉并暂时圈养了迁徙的北方小麦品种Oenanthe oenanthe。我们将鸟类晚上的燃料储存与它们夜间迁徙的开始联系起来。在北方麦穗，这是一个可靠的代理，他们的实际出发时间在自由飞行的条件。我们观察到一个强大的负面内的个人影响的燃料商店开始迁徙不安。随着燃料储备的增加，鸟类提前开始躁动。这清楚地表明，夜间燃料储备对移徙者夜间离开的时间很重要。因此，除了先天节律的调节外，春季迁徙期间夜间离开的时间也取决于燃料储存的线索。(C)2016动物行为研究协会。由爱思唯尔有限公司出版。保留所有权利。
Migrating animals typically make stopovers to rest and replenish the fuel used during previous travel bouts. In birds, fat or fast refuelling individuals are generally more likely to depart from stopover than lean or slow refuelling birds. The departure decision, however, involves more than the day-to-day departure likelihood. Also, the time of night (or day) at which migrants depart is relevant, as this largely determines the duration of the flight bout and thereby affects the speed of migration. Because stopovers serve to replenish fuel stores, longitudinal data are most informative regarding the relationship between fuel stores and nocturnal departure time, but no such data exist. To fill parts of this gap, we caught and temporarily caged migrating northern wheatears, Oenanthe oenanthe, at a spring stopover site. We related the birds' evening fuel stores to their start of nocturnal migratory restlessness. In northern wheatears, this is a reliable proxy for their actual departure time under free-flying conditions. We observed a strong negative within-individual effect of fuel stores on the start of migratory restlessness. With an increase in fuel stores birds advanced their start of restlessness. This clearly shows that evening fuel stores are important for migrants' timing of departure at night. Hence, next to the regulation by innate rhythms, the timing of nocturnal departures during spring migration also depends on cues from fuel stores. (C) 2016 The Association for the Study of Animal Behaviour. Published by Elsevier Ltd. All rights reserved.