The Magnetic Compass of Domestic Chickens, Gallus Gallus.
From: FB Biowissenschaften, J. W. Goethe-Universität Frankfurt, D-61231 Frankfurt am Main, Germany. wiltschko@bio.uni-frankfurt.de
The Journal of experimental biology
- Publish Date: Jul 2007
- ISSN: 0022-0949
- Volume: 210
- Issue: Pt 13
- Pages: 2300-10
- Medium: Print
- Language: English
- Citation (JAMA): Wiltschko Wolfgang, Freire Rafael, Munro Ursula, et al. The Magnetic Compass of Domestic Chickens, Gallus Gallus.. J. Exp. Biol. Jul 2007;210:2300-10
Abstract
By directional training, young domestic chickens have been shown to use a magnetic compass; the same method has now been used to analyse the functional characteristics and the physical principles underlying the chickens’ magnetic compass. Tests in magnetic fields with different intensities revealed a functional window around the intensity of the local geomagnetic field, with this window extending further towards lower than higher intensities. Testing chickens under monochromatic 465 nm blue and 645 nm red light suggested a wavelength dependence, with orientation possible under blue but not under red light. Exposing chickens to an oscillating field of 1.566 MHz led to disorientation, identifying an underlying radical pair mechanism. Local anesthesia of the upper beak, where iron-rich structures have been described as potential magnetoreceptors, did not affect the performance, suggesting that these receptors are not involved in compass orientation. These findings show obvious parallels to the magnetic compass described for European robins, indicating that chickens and small passerines use the same type of magnetic compass mechanism. This suggests that the avian magnetic compass may have evolved in the common ancestor of all present-day birds to facilitate orientation within the home range.
Mesh Headings (Keywords): Animals, Chickens, Homing Behavior, Magnetics, Orientation
Check for Full Text / PubMed Unique Identifier (PMID): 17575035
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