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Autumn migratory orientation and displacement responses of two willow warbler subspecies (Phylloscopus trochilus trochilus and P. t. acredula) in South Sweden.

Ilieva, Mihaela; Toews, David P L; Bensch, Staffan LU ; Sjöholm, Christoffer and Åkesson, Susanne LU (2012) In Behavioural Processes 91(3). p.253-261
Abstract
Topography and historical range expansion has formed a so-called migratory divide between two subspecies of willow warbler (Phylloscopus trochilus) in central Scandinavia. The autumn migratory directions of individuals assigned molecularly to both subspecies and possible hybrids were recorded using orientation cage experiments in southwest and southeast Sweden. We found pronounced differences in willow warblers' orientation in respect to genotype. The mean directions registered in the control experiments were in accordance with the ringing recoveries and analyses of stable isotopes for Scandinavian willow warblers. With the same individuals we performed displacement experiments between both sites. They resulted in non-significant... (More)
Topography and historical range expansion has formed a so-called migratory divide between two subspecies of willow warbler (Phylloscopus trochilus) in central Scandinavia. The autumn migratory directions of individuals assigned molecularly to both subspecies and possible hybrids were recorded using orientation cage experiments in southwest and southeast Sweden. We found pronounced differences in willow warblers' orientation in respect to genotype. The mean directions registered in the control experiments were in accordance with the ringing recoveries and analyses of stable isotopes for Scandinavian willow warblers. With the same individuals we performed displacement experiments between both sites. They resulted in non-significant orientation, which could be explained by the intermediate distance of the displacement or reactions to housing, transportation and location. On a separate set of birds we tested whether stress following transportation could explain the disorientation and found that orientation before and after transport was unchanged. Experimental studies of effects of intermediate displacements across longitudes and studies of orientation of hybrid individuals in the zones of migratory divides are crucial for understanding the mechanisms underlying orientation behaviour. Our work further stresses the importance of knowing the migration genotype of a particular bird under study, in order to correctly evaluate expected migration routes. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Displacement, Genetic differences, Migratory divide, Orientation, Subspecies, Willow warbler
in
Behavioural Processes
volume
91
issue
3
pages
253 - 261
publisher
Elsevier
external identifiers
  • wos:000311660200006
  • pmid:23022572
  • scopus:84868213260
ISSN
0376-6357
DOI
10.1016/j.beproc.2012.09.005
project
BECC
Migratory genes in willow warblers
CAnMove
language
English
LU publication?
yes
id
100198d5-385e-4d7f-9bc9-68af13bc06bb (old id 3161375)
date added to LUP
2012-12-18 13:57:24
date last changed
2017-07-09 03:28:23
@article{100198d5-385e-4d7f-9bc9-68af13bc06bb,
  abstract     = {Topography and historical range expansion has formed a so-called migratory divide between two subspecies of willow warbler (Phylloscopus trochilus) in central Scandinavia. The autumn migratory directions of individuals assigned molecularly to both subspecies and possible hybrids were recorded using orientation cage experiments in southwest and southeast Sweden. We found pronounced differences in willow warblers' orientation in respect to genotype. The mean directions registered in the control experiments were in accordance with the ringing recoveries and analyses of stable isotopes for Scandinavian willow warblers. With the same individuals we performed displacement experiments between both sites. They resulted in non-significant orientation, which could be explained by the intermediate distance of the displacement or reactions to housing, transportation and location. On a separate set of birds we tested whether stress following transportation could explain the disorientation and found that orientation before and after transport was unchanged. Experimental studies of effects of intermediate displacements across longitudes and studies of orientation of hybrid individuals in the zones of migratory divides are crucial for understanding the mechanisms underlying orientation behaviour. Our work further stresses the importance of knowing the migration genotype of a particular bird under study, in order to correctly evaluate expected migration routes.},
  author       = {Ilieva, Mihaela and Toews, David P L and Bensch, Staffan and Sjöholm, Christoffer and Åkesson, Susanne},
  issn         = {0376-6357},
  keyword      = {Displacement,Genetic differences,Migratory divide,Orientation,Subspecies,Willow warbler},
  language     = {eng},
  number       = {3},
  pages        = {253--261},
  publisher    = {Elsevier},
  series       = {Behavioural Processes},
  title        = {Autumn migratory orientation and displacement responses of two willow warbler subspecies (Phylloscopus trochilus trochilus and P. t. acredula) in South Sweden.},
  url          = {http://dx.doi.org/10.1016/j.beproc.2012.09.005},
  volume       = {91},
  year         = {2012},
}