RT Journal Article
T1 Decoupling of behavioural and morphological differentiation in a partially migratory bird population
A1 Morganti, Michelangelo
A1 Åkesson, Sussanne
A1 Pulido Delgado, Francisco
AB 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 (δD) 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 stableisotope signatures.
PB Taylor & Francis
SN 0006-3657, ESSN: 1944-6705
YR 2015
FD 2015
LK https://hdl.handle.net/20.500.14352/35428
UL https://hdl.handle.net/20.500.14352/35428
LA eng
NO Ministerio de Ciencia e Innovación (MICINN)
NO Ministerio de Educación y Ciencia (España)
NO Swedish Research Council
NO Italian Ministry of Education, University and Research
DS Docta Complutense
RD 9 abr 2025