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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Causes and consequences of within-population variation in inter-brood interval of a migratory songbird (2026)
Auteurs :	Hayley A. Spina, Auteur ; Amy E. M. Newman, Auteur ; Nathaniel T. Wheelwright, Auteur ; Daniel J. Mennill, Auteur ; Stéphanie M. Doucet, Auteur ; Joseph B. Burant, Auteur ; Sarah L. Dobney, Auteur ; Sarah D. Mueller, Auteur ; Greg W. Mitchell, Auteur ; D. Ryan Norris, Auteur
Type de document :	Article
Dans :	Ibis (168(1) January, 2026)
Article en page(s) :	182-200
Langues:	Anglais
Mots-clés:	Savannah Sparrow ; fecundity ; individual quality ; inter-clutch interval ; interbrood interval
Résumé :	Many birds produce two broods each year and exhibit significant intra-population variation in the length of time between the hatching of first and second broods (the inter-brood interval). Why within-population variation in inter-brood interval occurs and whether longer inter-brood intervals influence second-brood survival remain key questions in understanding the benefits of producing a second brood. We examined the causes and consequences of variation in inter-brood interval in a wild population of migratory Savannah Sparrows Passerculus sandwichensis breeding on Kent Island, New Brunswick, Canada. Using a 29-year dataset, we show that females tended to have short inter-brood intervals when their first nest was initiated later in the season, when they had a low number of first-brood fledglings to care for, or when they had higher lifetime recruitment (suggesting that they were of higher quality). Males with the shortest and longest inter-brood intervals had low feeding rates. Finally, structural equation modelling provided evidence that longer inter-brood intervals led to later second-brood hatch dates, which in turn led to smaller clutch sizes and fewer recruits. Our results suggest that the length of time between broods is a key factor predicting the first-year survival of second-brood offspring. These long-term data reveal that inter-brood interval reflects the timing of breeding and variation in female quality and that it influences offspring survival and, likely, fitness.
En ligne :	https://onlinelibrary.wiley.com/doi/abs/10.1111/ibi.13438

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