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

Åkesson, Susanne LU ; Morin, J; Muheim, Rachel LU and Ottosson, Ulf LU (2002) In Animal Behaviour 64(3). p.469-475
Abstract
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... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Animal Behaviour
volume
64
issue
3
pages
469 - 475
publisher
Elsevier
external identifiers
  • wos:000179105400015
  • scopus:0036403221
ISSN
1095-8282
DOI
10.1006/anbe.2002.3077
language
English
LU publication?
yes
id
4fe42086-e8a0-4a17-8cab-a966a34f5736 (old id 145474)
alternative location
http://dx.doi.org/
date added to LUP
2007-06-25 11:22:15
date last changed
2017-10-22 03:57:34
@article{4fe42086-e8a0-4a17-8cab-a966a34f5736,
  abstract     = {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.},
  author       = {Åkesson, Susanne and Morin, J and Muheim, Rachel and Ottosson, Ulf},
  issn         = {1095-8282},
  language     = {eng},
  number       = {3},
  pages        = {469--475},
  publisher    = {Elsevier},
  series       = {Animal Behaviour},
  title        = {Avian orientation: effects of cue-conflict experiments with young migratory songbirds in the high Arctic},
  url          = {http://dx.doi.org/10.1006/anbe.2002.3077},
  volume       = {64},
  year         = {2002},
}