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Correlates of postfledging survival, the timing of dispersal, and local recruitment in American Dippers

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Abstract:

Natal dispersal is a complex process that involves decisions about when to leave the natal territory, how to move through the landscape, and where to settle. We investigated what factors influence the timing of dispersal and local recruitment of American Dippers (Cinclus mexicanus Swainson, 1827) in Chilliwack, British Columbia. We monitored 102 fledglings from 30 broods between 2003 and 2005. Survival to 5 days after fledging was high (>80%), but individuals fledging early in the season and at an older age had higher survival than those fledging later and younger. Fifty-four percentage of surviving fledglings dispersed within 14 days of nest departure. Females and individuals that spent more time foraging were more likely to disperse within 14 days than males and individuals that foraged less. For those that dispersed, individuals that fledged early in the season and at older ages spent less time in their natal territory. Approximately 10% (10/82) of dispersing individuals were known to recruit locally. Local recruitment of individuals that delayed dispersal was higher than local recruitment of individuals dispersing early. Our study demonstrates that fitness benefits associated with extended natal philopatry are not restricted to cooperatively breeding birds.

La dispersion après la naissance est un processus complexe qui implique des décisions sur quand quitter le territoire natal, comment se déplacer à travers le paysage et où s’établir. Nous avons étudié les facteurs qui déterminent le moment de la dispersion et le recrutement local chez des cincles d’Amérique (Cinclus mexicanus Swainson, 1827) à Chilliwack, Colombie-Britannique. Nous avons suivi 102 jeunes à l’envol provenant de 30 couvées entre 2003 et 2005. La survie jusqu’à 5 jours après l’envol est élevée (>80 %), mais les petits qui prennent leur envol tôt dans la saison ou à un âge plus avancé ont des taux de survie plus grands que ceux qui s’envolent plus tard ou à un âge moins avancé. Cinquante-quatre pourcentage des petits qui survivent à l’envol se dispersent en moins de 14 jours après le départ du nid. Les femelles et les individus qui passent plus de temps à s’alimenter sont plus susceptibles de se disperser en dedans de 14 jours que les mâles et les individus qui s’alimentent moins. Chez ceux qui se dispersent, les individus qui prennent leur envol tôt dans la saison ou à un âge plus avancé passent moins de temps dans leur territoire natal. Nous avons observé qu’environ 10% (10/82) des individus qui se dispersent s’intègrent à la population locale. Le recrutement local des individus qui retardent leur dispersion est plus élevé que le recrutement local des individus qui se dispersent tôt. Notre étude démontre que les bénéfices de fitness associés à une philopatrie natale prolongée ne sont pas restreints aux oiseaux qui se reproduisent de manière coopérative.

Document Type: Research Article

Publication date: August 1, 2008

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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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