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Do migratory flight paths of raptors follow constant geographical or geomagnetic courses?

Thorup, K; Fuller, M; Alerstam, Thomas LU ; Hake, M; Kjellén, Nils LU and Strandberg, Roine LU (2006) In Animal Behaviour 72(4). p.875-880
Abstract
We tested whether routes of raptors migrating over areas with homogeneous topography follow constant geomagnetic courses more or less closely than constant geographical courses. We analysed the routes taken over land of 45 individual raptors tracked by satellite-based radiotelemetry: 25 peregrine falcons, Falco peregrinus, on autumn migration between North and South America, and seven honey buzzards, Pernis apivorus, and 13 ospreys, Pandion haliaetus, on autumn migration between Europe and Africa. Overall, migration directions showed a better agreement with constant geographical than constant geomagnetic courses. Tracks deviated significantly from constant geomagnetic courses, but were not significantly different from geographical courses.... (More)
We tested whether routes of raptors migrating over areas with homogeneous topography follow constant geomagnetic courses more or less closely than constant geographical courses. We analysed the routes taken over land of 45 individual raptors tracked by satellite-based radiotelemetry: 25 peregrine falcons, Falco peregrinus, on autumn migration between North and South America, and seven honey buzzards, Pernis apivorus, and 13 ospreys, Pandion haliaetus, on autumn migration between Europe and Africa. Overall, migration directions showed a better agreement with constant geographical than constant geomagnetic courses. Tracks deviated significantly from constant geomagnetic courses, but were not significantly different from geographical courses. After we removed movements directed far from the mean direction, which may not be migratory movements, migration directions still showed a better agreement with constant geographical than constant geomagnetic courses, but the directions of honey buzzards and ospreys were not significantly different from constant geomagnetic courses either. That migration routes of raptors followed by satellite telemetry are in closer accordance with constant geographical compass courses than with constant geomagnetic compass courses may indicate that geographical (e.g. based on celestial cues) rather than magnetic compass mechanisms are of dominating importance for the birds' long-distance orientation. Published by Elsevier Ltd on behalf of The Association for the Study or Animal Behaviour. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Animal Behaviour
volume
72
issue
4
pages
875 - 880
publisher
Elsevier Ltd
external identifiers
  • wos:000241105800016
  • scopus:33748596620
ISSN
1095-8282
DOI
10.1016/j.anbehav.2006.01.028
language
English
LU publication?
yes
id
8ac288bb-d270-468a-9caa-80d69c14b043 (old id 162764)
date added to LUP
2007-06-26 12:26:09
date last changed
2019-02-20 04:27:30
@article{8ac288bb-d270-468a-9caa-80d69c14b043,
  abstract     = {We tested whether routes of raptors migrating over areas with homogeneous topography follow constant geomagnetic courses more or less closely than constant geographical courses. We analysed the routes taken over land of 45 individual raptors tracked by satellite-based radiotelemetry: 25 peregrine falcons, Falco peregrinus, on autumn migration between North and South America, and seven honey buzzards, Pernis apivorus, and 13 ospreys, Pandion haliaetus, on autumn migration between Europe and Africa. Overall, migration directions showed a better agreement with constant geographical than constant geomagnetic courses. Tracks deviated significantly from constant geomagnetic courses, but were not significantly different from geographical courses. After we removed movements directed far from the mean direction, which may not be migratory movements, migration directions still showed a better agreement with constant geographical than constant geomagnetic courses, but the directions of honey buzzards and ospreys were not significantly different from constant geomagnetic courses either. That migration routes of raptors followed by satellite telemetry are in closer accordance with constant geographical compass courses than with constant geomagnetic compass courses may indicate that geographical (e.g. based on celestial cues) rather than magnetic compass mechanisms are of dominating importance for the birds' long-distance orientation. Published by Elsevier Ltd on behalf of The Association for the Study or Animal Behaviour.},
  author       = {Thorup, K and Fuller, M and Alerstam, Thomas and Hake, M and Kjellén, Nils and Strandberg, Roine},
  issn         = {1095-8282},
  language     = {eng},
  number       = {4},
  pages        = {875--880},
  publisher    = {Elsevier Ltd},
  series       = {Animal Behaviour},
  title        = {Do migratory flight paths of raptors follow constant geographical or geomagnetic courses?},
  url          = {http://dx.doi.org/10.1016/j.anbehav.2006.01.028},
  volume       = {72},
  year         = {2006},
}