Geographical and temporal flexibility in the response to crosswinds by migrating raptors
Geographical and temporal flexibility in the response to crosswinds by migrating raptors
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DOI：
10.1098/rspb.2010.2106
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发表时间：
2011-05-07
影响因子：
4.7
通讯作者：
Alerstam, Thomas
中科院分区：
文献类型：
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作者：
Klaassen, Raymond H. G.;Hake, Mikael;Alerstam, Thomas
风和洋流可能会对旅行的动物产生重要影响，因为对横向流动没有反应的动物将从其预期的运动方向漂移。通过分析迁徙的鱼鹰Pandion haliaetus和沼泽鹞Circus aerodynosus的日常活动，如卫星遥测记录的，与全球风数据，我们发现，这些猛禽允许平均47%的漂移。此外，我们的分析揭示了显着的地理和时间变化的侧风的反应。在迁徙的某些部分，鸟类会漂流，而在其他部分，它们会补偿甚至过度补偿。在某些地区，沼泽鹞的反应取决于风向。当风来自一侧时，它们会漂移，当风来自另一侧时，它们会（过度）补偿，这种灵活的反应在不同的地理区域是不同的。这些结果表明，迁徙猛禽调制他们的侧风在不同的地方和时间在他们的旅行，并显示个别鸟类使用更多样化的剧目的行为反应风比迄今为止假设的。我们的研究结果也可以解释为什么对比和变量的结果已经在以前的研究风对鸟类迁徙的影响。
Wind and ocean currents may potentially have important effects on travelling animals, as an animal which does not respond to lateral flow will be drifted from its intended direction of movement. By analysing daily movements of migrating ospreys Pandion haliaetus and marsh harriers Circus aeruginosus, as recorded by satellite telemetry, in relation to global wind data, we showed that these raptors allow on average 47 per cent drift. Furthermore, our analyses revealed significant geographical and temporal variation in the response to crosswinds. During some parts of the migration, the birds drifted and in other parts they compensated or even overcompensated. In some regions, the response of marsh harriers depended on the wind direction. They drifted when the wind came from one side and (over)compensated when the wind came from the opposite side, and this flexible response was different in different geographical regions. These results suggest that migrating raptors modulate their response to crosswinds at different places and times during their travels and show that individual birds use a much more varied repertoire of behavioural responses to wind than hitherto assumed. Our results may also explain why contrasting and variable results have been obtained in previous studies of the effect of wind on bird migration.