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Behavioral Ecology and Sociobiology

, Volume 54, Issue 6, pp 562–572 | Cite as

Orientation behavior of homing pigeons at the Gernsheim anomaly

  • Roswitha WiltschkoEmail author
  • Wolfgang Wiltschko
Original Article

Abstract

Pigeons were released at four release sites within the Gernsheim anomaly, a magnetic 'hill' with a peak 199 nT above the regional reference field and gentle 'slopes' to all sides, situated 44 km south of the Frankfurt loft. Local magnetic conditions at the sites differed in total intensity and in direction and steepness of the intensity gradient. At all sites, the pigeons were well oriented, showing counterclockwise deviations from the home directions that were most pronounced in the western part of the anomaly. There was no systematic difference in orientation behavior or homing performance between the sites within the anomaly and a control site outside. No effect of the local gradient direction was found, nor did the difference in intensity between home loft and the release site affect behavior. This argues against the use of magnetic navigational factors. However, pigeons released for the first time within the anomaly tended to have longer mean vectors with increasingly steeper gradients, which could mean that the birds might somehow have realized the anomalous nature of the local magnetic conditions and ignored them, relying on non-magnetic cues instead.

Keywords

Geomagnetic field Homing pigeons Magnetic anomaly Navigation Release site bias 

Notes

Acknowledgements

Our work was supported by the Deutsche Forschungsgemeinschaft. We sincerely thank R. Blum, Hessisches Landesamt für Bodenforschung, Wiesbaden, and A. Junge, Geophysik der Unversität Frankfurt, for their valuable help with obtaining the magnetic data of the area, and C. Becker, M. Geil, O. Henseler, W. Raabe, T. Ruch, M. Szczepanski, P. Thalau and D. Zeller with releasing the pigeons. The experiments were performed in accordance with the rules and regulations of Germany.

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Copyright information

© Springer-Verlag 2003

Authors and Affiliations

  1. 1.Fachbereich Biologie und InformatikJ.W.Goethe-Universität Frankfurt am MainFrankfurt am MainGermany

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