Advanced

Decoupling of behavioural and morphological differentiation in a partially migratory bird population

Morganti, Michelangelo; Åkesson, Susanne LU and Pulido, Francisco (2015) In Bird Study 62(1). p.29-38
Abstract
Capsule Resident Blackcaps in eastern Spain differ in morphology and isotope profile from central European conspecifics wintering in the area, but not from locally breeding migrants. Aims Natural selection shapes flight morphology in relation to migratory habits. Thus, intraspecific variation in migratory behaviour is often paralleled by morphological differentiation. We test whether differences in flight morphology between migrants and residents can evolve in a partially migratory bird population. Methods We explored morphological differences among three categories of Blackcaps Sylvia atricapilla from a single study site in eastern Spain: residents, locally breeding migrants and wintering birds. We used discriminant function analyses to... (More)
Capsule Resident Blackcaps in eastern Spain differ in morphology and isotope profile from central European conspecifics wintering in the area, but not from locally breeding migrants. Aims Natural selection shapes flight morphology in relation to migratory habits. Thus, intraspecific variation in migratory behaviour is often paralleled by morphological differentiation. We test whether differences in flight morphology between migrants and residents can evolve in a partially migratory bird population. Methods We explored morphological differences among three categories of Blackcaps Sylvia atricapilla from a single study site in eastern Spain: residents, locally breeding migrants and wintering birds. We used discriminant function analyses to determine whether a set of morphological features was effective in predicting migratory status. In addition, we analysed deuterium (delta D) in claws and feathers to identify wintering areas. Results Discriminant functions identified central European Blackcaps wintering in the area, but failed to find morphological differences between residents and local migrants that also did not differ in isotopic profiles. Conclusions Lack of morphological and isotopic differences between migrant and resident fractions of the partially migratory population, suggests a facultative determination of migratory behaviour. Alternatively, migratory movements of migrants from this population may be too short to be detected using stable-isotope signatures. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Bird Study
volume
62
issue
1
pages
29 - 38
publisher
British Trust for Ornithology
external identifiers
  • wos:000349155200003
  • scopus:84922401805
ISSN
0006-3657
DOI
10.1080/00063657.2014.971703
language
English
LU publication?
yes
id
49ad0a18-aa5e-4235-8d58-07f4bedfebda (old id 5194568)
date added to LUP
2015-03-25 11:27:21
date last changed
2017-04-02 03:47:38
@article{49ad0a18-aa5e-4235-8d58-07f4bedfebda,
  abstract     = {Capsule Resident Blackcaps in eastern Spain differ in morphology and isotope profile from central European conspecifics wintering in the area, but not from locally breeding migrants. Aims Natural selection shapes flight morphology in relation to migratory habits. Thus, intraspecific variation in migratory behaviour is often paralleled by morphological differentiation. We test whether differences in flight morphology between migrants and residents can evolve in a partially migratory bird population. Methods We explored morphological differences among three categories of Blackcaps Sylvia atricapilla from a single study site in eastern Spain: residents, locally breeding migrants and wintering birds. We used discriminant function analyses to determine whether a set of morphological features was effective in predicting migratory status. In addition, we analysed deuterium (delta D) in claws and feathers to identify wintering areas. Results Discriminant functions identified central European Blackcaps wintering in the area, but failed to find morphological differences between residents and local migrants that also did not differ in isotopic profiles. Conclusions Lack of morphological and isotopic differences between migrant and resident fractions of the partially migratory population, suggests a facultative determination of migratory behaviour. Alternatively, migratory movements of migrants from this population may be too short to be detected using stable-isotope signatures.},
  author       = {Morganti, Michelangelo and Åkesson, Susanne and Pulido, Francisco},
  issn         = {0006-3657},
  language     = {eng},
  number       = {1},
  pages        = {29--38},
  publisher    = {British Trust for Ornithology},
  series       = {Bird Study},
  title        = {Decoupling of behavioural and morphological differentiation in a partially migratory bird population},
  url          = {http://dx.doi.org/10.1080/00063657.2014.971703},
  volume       = {62},
  year         = {2015},
}