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Effects of magnetic manipulations on orientation: comparing diurnal and nocturnal passerine migrants on Capri, Italy in autumn.

Åkesson, Susanne LU ; Jonzén, Niclas LU ; Pettersson, J ; Rundberg, M and Sandberg, Roland LU (2006) In Ornis Svecica 16(1-2). p.55-61
Abstract
Orientation cage experiments were performed on Capri in Italy, with a diurnal passerine migrant (Tree Pipit Anthus trivialis), and a nocturnal passerine migrant (Garden Warbler Sylvia borin), to study the use of magnetic compass information during autumn passage migration. The experiments were performed outdoors at sunset in: (1) the local geomagnetic field under natural clear skies, (2) a shifted magnetic field (mN -90[degree]) under clear skies, and (3) a shifted magnetic field (mN -90[degree]) under simulated overcast skies. Day migrating Tree Pipits showed a clear shift in orientation compared to controls (i.e. local geomagnetic field and clear sky conditions) corresponding roughly with the magnetic shift (mN -90[degree]) under clear... (More)
Orientation cage experiments were performed on Capri in Italy, with a diurnal passerine migrant (Tree Pipit Anthus trivialis), and a nocturnal passerine migrant (Garden Warbler Sylvia borin), to study the use of magnetic compass information during autumn passage migration. The experiments were performed outdoors at sunset in: (1) the local geomagnetic field under natural clear skies, (2) a shifted magnetic field (mN -90[degree]) under clear skies, and (3) a shifted magnetic field (mN -90[degree]) under simulated overcast skies. Day migrating Tree Pipits showed a clear shift in orientation compared to controls (i.e. local geomagnetic field and clear sky conditions) corresponding roughly with the magnetic shift (mN -90[degree]) under clear as well as overcast skies, while the Garden Warbler migrating at night, did not respond to the same magnetic manipulations by shifting their preferred directions in the cages. The mean orientation of Tree Pipits did not differ from the sun's position during experiments, while it was clearly different in Garden Warblers. Species-specific orientation responses to experimental manipulations in caged compared to free-flying migrants is discussed. (Less)
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author
; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Ornis Svecica
volume
16
issue
1-2
pages
55 - 61
publisher
Sveriges Ornitologiska Förening
external identifiers
  • scopus:33646449966
ISSN
1102-6812
language
English
LU publication?
yes
id
af18a808-313e-4a37-b7f1-236a4e0a0cc2 (old id 164525)
date added to LUP
2016-04-01 17:01:07
date last changed
2020-01-12 19:58:00
@article{af18a808-313e-4a37-b7f1-236a4e0a0cc2,
  abstract     = {Orientation cage experiments were performed on Capri in Italy, with a diurnal passerine migrant (Tree Pipit Anthus trivialis), and a nocturnal passerine migrant (Garden Warbler Sylvia borin), to study the use of magnetic compass information during autumn passage migration. The experiments were performed outdoors at sunset in: (1) the local geomagnetic field under natural clear skies, (2) a shifted magnetic field (mN -90[degree]) under clear skies, and (3) a shifted magnetic field (mN -90[degree]) under simulated overcast skies. Day migrating Tree Pipits showed a clear shift in orientation compared to controls (i.e. local geomagnetic field and clear sky conditions) corresponding roughly with the magnetic shift (mN -90[degree]) under clear as well as overcast skies, while the Garden Warbler migrating at night, did not respond to the same magnetic manipulations by shifting their preferred directions in the cages. The mean orientation of Tree Pipits did not differ from the sun's position during experiments, while it was clearly different in Garden Warblers. Species-specific orientation responses to experimental manipulations in caged compared to free-flying migrants is discussed.},
  author       = {Åkesson, Susanne and Jonzén, Niclas and Pettersson, J and Rundberg, M and Sandberg, Roland},
  issn         = {1102-6812},
  language     = {eng},
  number       = {1-2},
  pages        = {55--61},
  publisher    = {Sveriges Ornitologiska Förening},
  series       = {Ornis Svecica},
  title        = {Effects of magnetic manipulations on orientation: comparing diurnal and nocturnal passerine migrants on Capri, Italy in autumn.},
  volume       = {16},
  year         = {2006},
}