J-Exp-Biol-2011-Wiltschko-3096-101

2019-08-01 15:49  下载量：0

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The avian magnetic compass is an inclination compass that appears to be based on radical pair processes. It requires light from the short-wavelength range of the spectrum up to 565?nm green light; under longer wavelengths, birds are disoriented. When preexposed to longer wavelengths for 1?h, however, they show oriented behavior. This orientation is analyzed under 582?nm yellow light and 645?nm red light in the present study: while the birds in spring prefer northerly directions, they do not show southerly tendencies in autumn. Inversion of the vertical component does not have an effect whereas reversal of the horizontal component leads to a corresponding shift, indicating that a polar response to the magnetic field is involved.

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