Depolarization of natural skylight disrupts orientation of an avian nocturnal migrant |
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Authors: | A J Helbig |
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Institution: | (1) Zoologisches Institut, Universität Frankfurt/M., Siesmayerstr. 70, D-6000 Frankfurt, (Federal Republic of Germany) |
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Abstract: | Summary Given a view of clear evening skies, migratory blackcaps (Aves:Sylvia atricapilla) orient appropriately in the absence of meaningful information from the geomagnetic field. When the intensity of natural skylight polarization patterns was reduced with pseudodepolarizers by over 90%, test birds were disoriented, and their migratory restlessness in autumn was drastically reduced. |
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Keywords: | Orientation skylight polarization bird migration pseudodepolarizer Sylvia atricapilla |
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