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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Ecological opportunities and individual condition as predictors of extra-pair paternity in a south-temperate swallow (Tachycineta leucorrhoa) (2018)
Auteurs :	Valentina Ferretti, Auteur ; Viviana Massoni, Auteur ; Florencia Bulit, Auteur ; Irby J. Lovette, Auteur
Type de document :	Article
Dans :	Journal of Field Ornithology (89(3) September, 2018)
Article en page(s) :	221-233
Langues:	Anglais
Mots-clés:	Hirundinidae ; body condition ; breeding density ; breeding synchrony ; extra-pair paternity ; mating system
Résumé :	Ecological and physiological factors such as breeding density, breeding synchrony, and adult body condition can all affect extra-pair mating behavior, but the relative importance of these factors may vary among species. White-rumped Swallows (Tachycineta leucorrhoa) nesting in Buenos Aires Province, Argentina, exhibit high rates of extra-pair paternity, with 77% of nests having extra-pair young. Our objective was to determine the extent to which extra-pair paternity in this species is explained by breeding synchrony, breeding density, and adult body condition. Our study of a population of White-rumped Swallows breeding in nest boxes was conducted during two consecutive breeding seasons (September – early January 2006–2008). We found that neither breeding synchrony nor density of neighbors predicted levels of extra-pair paternity in our study population. Leaner females were more likely to engage in extra-pair behavior and fledged more nestlings, but did not differ in structural size from females that did not engage in extra-pair behavior, suggesting that female mass is an important predictor of mating decisions and fitness for these aerial insectivores. Male body condition was not related to male extra-pair behavior. The mass of female White-rumped Swallows may affect their flying ability such that, during their fertile period, they are exposed to more potential extra-pair mates during longer foraging flights. Being lighter may also improve the ability of females to provision nestlings later in the breeding cycle.
En ligne :	https://onlinelibrary.wiley.com/doi/abs/10.1111/jofo.12259

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