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Apparent survival, natal philopatry, and recruitment of Barrow’s goldeneyes (Bucephala islandica) in the Cariboo-Chilcotin region of British Columbia, Canada

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We used capture-resight data to evaluate apparent survival, natal philopatry, and recruitment of Barrow’s goldeneyes (Bucephala islandica (Gmelin, 1789)) in British Columbia, Canada. Median ages of first pairing and first breeding for females were 2 years and 3 years, respectively. The Cormack-Jolly-Seber model that best fit our data indicated that apparent survival rates (φ) differed according to sex, year, and age class at marking. Estimates were similar for after-hatch-year (AHY) females (0.62) and AHY males (0.58), which was consistent with predictions. However, contrary to predictions, apparent survival rates of hatch-year (HY) females (0.68) were similar to those of AHY females and significantly higher than those of HY males (0.35). We interpret this difference as being primarily related to higher dispersal probabilities by HY males. Also evident was a negative correlation between apparent survival rate during the 1st year after capture for HY birds and their subsequent apparent survival rates, which suggests that probability of dispersal increased after these birds reached reproductive maturity and began to compete for breeding territories. We interpret this as evidence for density-dependent control of access to limited resources such as nest cavities.

Nous utilisons des données de captures et d’observations subséquentes afin d’évaluer la survie apparente, la philopatrie natale et le recrutement du garrot d’Islande (Bucephala islandica (Gmelin, 1789)) en Colombie-Britannique, Canada. Les âges moyens de première formation des couples et de première reproduction chez les femelles sont respectivement de 2 ans et de 3 ans. Le modèle Cormack-Jolly-Seber qui s’ajuste le mieux à nos données indique que les taux de survie apparente (φ) varient en fonction du sexe, de l’année et de la classe d’âge au moment du marquage. Les estimations pour les femelles de l’année après l’éclosion (AHY) (0,62) et pour les mâles AHY (0,58) sont semblables, ce qui s’accorde aux prédictions. Cependant, contrairement aux prédictions, les taux de survie apparente des femelles de l’année de l’éclosion (HY) (0,68) sont semblables à ceux des femelles AHY et significativement plus élevés que ceux des mâles HY (0,35). Nous interprétons cette différence comme étant principalement le reflet des probabilités plus élevées de dispersion des mâles HY. Il apparaît aussi une corrélation négative entre la survie apparente durant la première année après la capture chez les oiseaux HY et leurs taux subséquents de survie apparente, ce qui indique que la probabilité de dispersion augmente une fois que ces oiseaux atteignent la maturité reproductive et commencent à faire compétition pour les territoires de reproduction. Nous interprétons ces faits comme des indications d’un contrôle dépendant de la densité de l’accès aux ressources limitées, telles que les cavités de nidification.

Document Type: Research Article

Publication date: 2009-04-01

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  • Published since 1929, this monthly journal reports on primary research contributed by respected international scientists in the broad field of zoology, including behaviour, biochemistry and physiology, developmental biology, ecology, genetics, morphology and ultrastructure, parasitology and pathology, and systematics and evolution. It also invites experts to submit review articles on topics of current interest.
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