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Magnetite-based magnetoreception in birds: the effect of a biasing field and a pulse on migratory behavior

Wolfgang Wiltschko1,*, Ursula Munro2, Roswitha Wiltschko1 and Joseph L. Kirschvink3,4

1 Fachbereich Biologie und Informatik, Zoologie, J. W. Goethe-Universität Frankfurt am Main, Siesmayerstrasse 70, D 60054 Frankfurt am Main, Germany
2 Department of Environmental Sciences, University of Technology, Sydney, PO Box 123, Broadway, NSW 2007, Australia
3 Division of Geological and Planetary Science, The California Institute of Technology, Pasadena, CA 91125, USA
4 Department of Earth and Planetary Sciences, University of Tokyo, Hongo Campus, Tokyo, Japan



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  		Fig. 1. Orientation behavior of silvereyes during the control phase (A) after exposure to the biasing field of 1 mT (B) and after treatment with a brief, strong magnetic pulse in the presence of the same biasing field (C). Left: PAR birds where the pulse was parallel to the biasing field; right: ANTI birds where the pulse was antiparallel to the biasing field. In A, the arrows represent mean vectors of up to six recordings per individual bird, drawn proportionally to the radius of the circle; the symbols at the periphery mark the mean headings. In B and C, symbols at the periphery represent headings of individual tests (in C: outside=day 1; inside=day 2), and the arrows give the axial vector of the respective data.

 

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© The Company of Biologists Ltd 2002