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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Age-dependent breeding dispersal and adult survival within a metapopulation of Common Terns Sterna hirundo
Auteurs :	Andre R. Breton, Auteur ; Ian C. T. Nisbet, Auteur ; Carolyn S. Mostello, Auteur ; Jeremy J. Hatch, Auteur
Type de document :	Article
Dans :	Ibis (156(3) JUL 2014)
Article en page(s) :	534-547
Résumé :	Dispersal is increasingly recognized as a process of fundamental importance in population dynamics and other aspects of biology. Concurrently, interest in age-dependent effects on survival, including actuarial senescence, has increased, especially in studies of long-lived seabirds. Nevertheless, datasets necessary for studying dispersal and age-dependent effects are few, as these require simultaneous data collection at two or more sites over many years. We conducted a 22-year capture-mark-recapture study of Common Terns Sterna hirundo at three breeding colonies 10-26km apart in Buzzards Bay, Massachusetts, USA. All birds in the study were of known age (range 2-28years, median 7years, n=3290) and 77% were of known sex. Estimates of adult recapture, survival and breeding dispersal rates were obtained for all age-classes from 2 to 20years. The model that acquired 100% of the QAICc (Akaike's Information Criterion adjusted for small sample size and overdispersion) weight in our analysis included age-specificity in all parameters but no relationship with sex. Our study may be the first to demonstrate age-specificity in recapture, survival and breeding dispersal rates simultaneously, using a single model. Annual rates of breeding dispersal ranged from

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