Abstract
We studied the effects of colony size on individual reproductive success in a multi-site population of Black-headed Gulls Chroicocephalus ridibundus where colony size ranged from 10 to 5,000 pairs. By focusing on family size, the number of chicks attended by individually marked parents, and accounting for between-individual variation, we detected a negative colony-size effect during the very first days of life of the chicks that was compensated by a subsequent increase in the proportion of surviving chicks with colony size. We suggest that this result originates in the interplay between overcrowding costs acting on hatching success, and benefits of colonial breeding, most probably more efficient food-searching (foraging enhancement), acting on chick survival. However, the frequency of complete colony failure increased with decreasing colony size. Taking this hazard risk into account yielded a corrected estimate of the effect of colony size on breeding success, and indicated that the largest colonies were the most productive. This pattern is congruent with the previous finding that larger colonies are more attractive to dispersing breeders.



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Acknowledgments
Thanks are due to all volunteers, students and researchers who contributed to the field work. We are grateful to land owners who gave access to their properties. We thank in particular J. Arquillère, Manager of La Ronze, for continuous support and help throughout this study. T. Boulinier kindly offered helpful comments on a first draft of this article. We are grateful to P.H. Becker, E.V.M. Stienen and an anonymous reviewer for improving this article.
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Communicated by P. H. Becker.
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Péron, G., Lebreton, JD. & Crochet, PA. Costs and benefits of colony size vary during the breeding cycle in Black-headed Gulls Chroicocephalus ridibundus . J Ornithol 151, 881–888 (2010). https://doi.org/10.1007/s10336-010-0526-8
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DOI: https://doi.org/10.1007/s10336-010-0526-8


