Fuelling decisions in migratory birds: geomagnetic cues override the seasonal effect
Fuelling decisions in migratory birds: geomagnetic cues override the seasonal effect
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DOI：
10.1098/rspb.2007.0554
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发表时间：
2007-09-07
影响因子：
4.7
通讯作者：
Fransson, Thord
中科院分区：
文献类型：
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作者：
Kullberg, Cecilia;Henshaw, Ian;Fransson, Thord
最近对鸟类迁徙的时间和空间精确性的评估要求，除了从方向、距离和沿着加油行为方面确定迁徙旅程的遗传方案之外，还需要外部线索。我们用少年欧洲知更鸟（Erithacus rubecula）研究地磁线索是否影响燃料沉积在一个中等距离的移民模拟从瑞典东南部的迁徙之旅在西班牙南部的越冬区。在秋季迁移的发病后期，知更鸟暴露于磁处理达到了较低的燃料负荷比控制鸟类暴露于瑞典东南部的环境磁场。与此相反，知更鸟捕获的早期阶段的发病秋季迁移都表现出低燃料沉积，无论实验治疗。这些结果是，正如预期的那样，相反的，我们已经发现在类似的研究中，在长距离的移民，画眉夜莺（Luscinia luscinia），这表明燃料行为方面的反应，以模拟向南迁移的物种的相关性而有所不同。此外，我们认为，从地磁场的信息作为一个重要的外部线索压倒季节性的影响，在候鸟的加油行为。
Recent evaluations of both temporal and spatial precision in bird migration have called for external cues in addition to the inherited programme defining the migratory journey in terms of direction, distance and fuelling behaviour along the route. We used juvenile European robins (Erithacus rubecula) to study whether geomagnetic cues affect fuel deposition in a medium-distance migrant by simulating a migratory journey from southeast Sweden to the wintering area in southern Spain. In the late phase of the onset of autumn migration, robins exposed to the magnetic treatment attained a lower fuel load than control birds exposed to the ambient magnetic field of southeast Sweden. In contrast, robins captured in the early phase of the onset of autumn migration all showed low fuel deposition irrespective of experimental treatment. These results are, as expected, the inverse of what we have found in similar studies in a long-distance migrant, the thrush nightingale (Luscinia luscinia), indicating that the reaction in terms of fuelling behaviour to a simulated southward migration varies depending on the relevance for the species. Furthermore, we suggest that information from the geomagnetic field act as an important external cue overriding the seasonal effect on fuelling behaviour in migratory birds.