Migrating songbirds recalibrate their magnetic compass daily from twilight cues
Migrating songbirds recalibrate their magnetic compass daily from twilight cues
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DOI：
10.1126/science.1095844
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发表时间：
2004-04-16
期刊：
影响因子：
56.9
通讯作者：
Wikelski, M
中科院分区：
文献类型：
--
作者：
Cochran, WW;Mouritsen, H;Wikelski, M
在圈养测试中，夜间迁徙的鸣鸟可以利用恒星、太阳、地磁场和偏振光进行定位。我们研究了自由飞行的鸣禽的磁场、恒星和黄昏方向线索之间的相互作用。我们在起飞前的黄昏时间将画眉暴露在向东转向的磁场中，然后跟随它们飞行了长达1100公里。实验鸟没有向北飞，而是向西飞。在接下来的几个晚上，这些人再次向北迁徙。我们建议鸟类使用磁罗盘定向，磁罗盘每天都会根据黄昏的信号进行校准。这可以解释鸟类如何穿越磁赤道，如何应对赤纬。
Night migratory songbirds can use stars, sun, geomagnetic field, and polarized light for orientation when tested in captivity. We studied the interaction of magnetic, stellar, and twilight orientation cues in free-flying songbirds. We exposed Catharus thrushes to eastward-turned magnetic fields during the twilight period before takeoff and then followed them for up to 1100 kilometers. Instead of heading north, experimental birds flew westward. On subsequent nights, the same individuals migrated northward again. We suggest that birds orient with a magnetic compass calibrated daily from twilight cues. This could explain how birds cross the magnetic equator and deal with declination.