| Titre : | Effect of neck collars on the body condition of migrating Greater Snow Geese |
| Auteurs : | Pierre Legagneux, Auteur ; Alice-Anne Simard, Auteur ; Gilles Gauthier, Auteur ; Joel Bety, Auteur |
| Type de document : | Article |
| Dans : | Journal of Field Ornithology (84(2) JUN 2013) |
| Article en page(s) : | 201-209 |
| Langues: | Anglais |
| Résumé : | Markers are widely used to study behavior, migration, and the life history traits of birds such as survival, dispersal, and reproductive success. The presence of neck collars has been shown to impact the breeding propensity of adult female Greater Snow Geese (Chen caerulescens atlantica), but not their survival rates. We evaluated the hypothesis that the reduction in breeding propensity in neck-collared birds was due to a reduction in the body condition of these long-distance migrants that rely on a partial capital breeding strategy. Our study was conducted during 4 consecutive years along the St. Lawrence estuary in Quebec, Canada, a major spring staging area for these geese. We captured and marked 2552 geese with collars and 34 were recaptured in subsequent years at the same site. After controlling for confounding variables such as year and date of capture, we found that the presence of a neck collar reduced body condition of females during spring staging. Female Greater Snow Geese lost an average of 105.5 +/- 39.1 (SE) g (4% of body mass) after carrying a collar for 1 yr and an average of 81.9 +/- 43.6 g compared to original mass when recaptured 2 or 3 yr later. Our results suggest that the previously reported reduction in breeding propensity of neck-collared geese may be due to a reduction in body condition during spring staging. Neck collars could negatively affect the body condition of female Greater Snow Geese by increasing their energy expenditure (due to increased drag during flight or to chronic stress) or reducing their foraging efficiency. |
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