Journal
JOURNAL OF ORNITHOLOGY
Volume 150, Issue 3, Pages 685-689Publisher
SPRINGER
DOI: 10.1007/s10336-009-0375-5
Keywords
Age ratio; Anas crecca; Body mass; Differential migration; Sex ratio; Teal; Winter
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Funding
- Agence Nationale de la Recherche
- Sante-Environnement/Sante au travail
- European Union's Framework Program for Research and Technological Development [FP6]
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The body size hypothesis predicts that if individuals of a population migrate different distances from the breeding to the wintering grounds, the distance should be related to the differential ability to cope with adverse conditions, with larger individuals wintering further north. Data collected over a 40-year period in Essex, UK and the Camargue, southern France, revealed that the average body mass of Teal ringed in Essex during these years was actually not greater than that of Teal ringed in the Camargue. A higher proportion of males were included in the UK ringing catch than in the French catch, but we found no support for the body size hypothesis to explain such differential migration of the sexes.
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