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

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Avian orientation: effects of cue-conflict experiments with young migratory songbirds in the high Arctic. / Åkesson, Susanne; Morin, J; Muheim, Rachel; Ottosson, Ulf.

I: Animal Behaviour, Vol. 64, Nr. 3, 2002, s. 469-475.

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

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T1 - Avian orientation: effects of cue-conflict experiments with young migratory songbirds in the high Arctic

AU - Åkesson, Susanne

AU - Morin, J

AU - Muheim, Rachel

AU - Ottosson, Ulf

PY - 2002

Y1 - 2002

N2 - 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.

AB - 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.

U2 - 10.1006/anbe.2002.3077

DO - 10.1006/anbe.2002.3077

M3 - Article

VL - 64

SP - 469

EP - 475

JO - The British Journal of Animal Behaviour

T2 - The British Journal of Animal Behaviour

JF - The British Journal of Animal Behaviour

SN - 1095-8282

IS - 3

ER -