Orientation in pied flycatchers:: the relative importance of magnetic and visual information at dusk
Orientation in pied flycatchers:: the relative importance of magnetic and visual information at dusk
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DOI：
10.1006/anbe.1998.1040
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发表时间：
1999-04-01
期刊：
影响因子：
2.5
通讯作者：
Bäckman, J
中科院分区：
文献类型：
--
作者：
Åkesson, S;Bäckman, J
我们利用方向笼实验研究了瑞典南部秋季迁徙期间斑鹟 (Ficedulahypoleuca) 幼年的方向，以研究日落时视觉和磁信息的相对重要性。我们在 12 种实验条件下进行了笼式测试，这些条件操纵了可用的地磁和视觉日落线索，用于定位：当地或垂直磁场中的自然晴朗天空；模拟局部垂直磁场中的总阴天；天光偏振的自然模式和来自星星的方向信息被屏蔽，太阳的位置正常或通过镜子逆时针移动 120 度；减少局部或垂直磁场中的极化；局部或垂直磁场中的极化方向（e 向量）分别为 NE/SW 和 NW/SE。当斑鹟可以结合使用天光和地磁线索时，它们的方向明显偏西偏南。随着镜子对日落位置的偏转，平均方向发生了显着的变化。减少的极化对局部或垂直磁场中的方向没有显着影响。鸟类倾向于与偏振轴平行的方向，但只有当人工电子矢量对准西北/东南时。模拟总阴天下的垂直方向和局部磁场的平均方向与随机方向没有显着差异。很难将任何一个线索列为主导：另一个，我们得出的结论是，在活跃的迁徙过程中被捕获和测试时，视觉和磁性线索似乎对鸟类的方向都很重要。 (C) 1999 动物行为研究协会。
We investigated the orientation of juvenile pied flycatchers, Ficedula hypoleuca, during autumn migration in south Sweden using orientation cage experiments, to study the relative importance of visual and magnetic information at sunset. We performed cage tests under 12 experimental conditions that manipulated the geomagnetic and visual sunset cues available, for orientation: natural clear skies in the local or a vertical magnetic field; simulated total overcast in the local pr a vertical magnetic field; natural pattern of skylight polarization and directional information from stars screened off, with the sun's position as normal or shifted 120 degrees anticlockwise with mirrors; reduced polarization in the local or a vertical magnetic field; directions of polarization (e-vector) NE/SW and NW/SE, respectively, in the local or a vertical magnetic field. The pied flycatchers were significantly oriented towards slightly south of west when they could use a combination of skylight and,geomagnetic cues. The mean orientation was significantly shifted along with the deflection of the sunset position by mirrors. Reduced polarization had no significant effect on orientation either in the local, or in a vertical, magnetic field. The birds tended to orient parallel with the axis of polarization, but only when the artificial e-vector was aligned NW/SE. The mean orientation under simulated total overcast in a vertical, and in the local, magnetic field was not significantly different from random. It is difficult to rank either cue as dominant over: the other and we conclude that both visual and magnetic cues seem to be important for the birds' orientation when caught and tested during active migration. (C) 1999 The Association for the Study of Animal Behaviour.