Timing of nocturnal autumn migratory departures in juvenile European robins (Erithacus rubecula) and endogenous and external factors
Timing of nocturnal autumn migratory departures in juvenile European robins (Erithacus rubecula) and endogenous and external factors
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DOI：
10.1007/s10336-005-0046-0
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发表时间：
2006-04-01
影响因子：
1.3
通讯作者：
Tsvey, A
中科院分区：
文献类型：
--
作者：
Bulyuk, VN;Tsvey, A
许多雀形目中距离夜间迁徙鸟类不仅在夜开始时从中途停留地起飞，而且也在半夜和夜末从中途停留地起飞。在本文中，我们测试了对此现象的两种解释：(1) 出发时间受燃料储备控制，(2) 出发时间受天气影响。研究了欧洲知更鸟 (Erithacus rubecula) 秋季迁徙期间夜间迁徙时间分布与身体状况和天气因素的关系。这项研究于 1997 年至 2003 年在波罗的海的库里什沙嘴上进行，在夜间迁徙期间用高雾网重新捕获了 74 只环斑鸟。出发时间与到达和出发时的燃料储存、中途停留时间、燃料沉积率或季节进展无关。出发时当地的天气也不会影响出发时间。一个可能的原因是鸟类行为的巨大差异。与停留时间较长的鸟类相比，停留 1 天的欧洲知更鸟在更好的天气条件下到达和离开。在前一组中，具有四个预测变量的显着模型解释了出发时间的 55% 的变化。据推测，出发当晚和前一天晚上的天气影响了这些鸟类的起飞时间。在进行长时间停留的知更鸟中，出发时间可能受其个体内源性昼夜节律活动的控制，而这些节律与环境以复杂的方式相关。
Many passerine medium distance nocturnal migrants take off from stopover sites not only at the beginning of the night, but also in the middle and at the end of the night. In this paper, we tested two explanations for this phenomenon: (1) that departure time is governed by fuel stores, and (2) that departure time is influenced by the weather. The relationship of temporal distribution of migratory nocturnal departures with body condition and weather factors was studied in juvenile European robins (Erithacus rubecula) during autumn migration. The study was done on the Courish Spit on the Baltic Sea in 1997-2003 by retrapping 74 ringed birds in high mist nets during nocturnal migratory departure. Departure time was not related to fuel stores at arrival and departure, stopover duration, fuel deposition rate or progress of the season. Nor did the local weather at departure influence departure time. A possible reason was a large variation in the behaviour of the birds. European robins which made 1-day stopovers arrived and departed during better weather conditions than birds that stopped over for longer periods. In the former cohort, a significant model with four predictors explained 55% of variation in departure time. It is assumed that weather at the night of departure and during the previous night influenced the time of take-offs in these birds. In robins which made long stopovers, departure time is probably governed by their individual endogenous circadian rhythms of activity, which are related to the environment in a complex way.