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Avian orientation: effects of cue-conflict experiments with young migratory songbirds in the high Arctic

Author:
  • Susanne Åkesson
  • J Morin
  • Rachel Muheim
  • Ulf Ottosson
Publishing year: 2002
Language: English
Pages: 469-475
Publication/Series: Animal Behaviour
Volume: 64
Issue: 3
Document type: Journal article
Publisher: Elsevier

Abstract english

The migratory orientation of juvenile white-crowned sparrows, Zonotrichia leucophrys gambelli, was investigated by orientation cage experiments in manipulated magnetic fields performed during the evening twilight period in northwestern Canada in autumn. We did the experiments under natural clear skies in three magnetic treatments: (1) in the local geomagnetic field; (2) in a deflected magnetic field (mN shifted -90degrees); and (3) after exposure to a deflected magnetic field (mN -90degrees) for 1 h before the cage experiment performed in the local geomagnetic field at dusk. Subjects showed a mean orientation towards geographical east in the local geomagnetic field, north of the expected migratory direction towards southeast. The sparrows responded consistently to the shifted magnetic field, demonstrating the use of a magnetic compass during their first autumn migration. Birds exposed to a cue conflict for 1 h on the same day before the experiment, and tested in the local geomagnetic field at sunset, showed the same northerly orientation as birds exposed to a shifted magnetic field during the experiment. This result indicates that information transfer occurred between magnetic and celestial cues. Thus, the birds' orientation shifted relative to available sunset and geomagnetic cues during the experimental hour. The mean orientation of birds exposed to deflected magnetic fields prior to and during testing was recorded up to two more times in the local geomagnetic field under natural clear and overcast skies before release, resulting in scattered mean orientations. (C) 2002 The Association for the Study of Animal Behaviour. Published by Elsevier Science Ltd. All rights reserved.

Keywords

  • Zoology
  • Biological Sciences

Other

Published
  • ISSN: 1095-8282
Rachel Muheim
E-mail: rachel.muheim [at] biol.lu.se

Researcher

Functional zoology

+46 46 222 31 93

B-B314

4

Centre for Animal Movement Research
Evolutionary Ecology, Department of Biology
Ecology building S-223 62 Lund Sweden