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Occasional inter-sex differences in diet and foraging behavior of the Blue-footed Booby: maximizing chick rearing in a variable environment?

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Abstract

Labor division in parental care and reduction of inter-sex competition by division of the foraging niche have been suggested as part of the evolutionary basis for reversed sexual size dimorphism in boobies (Sulidae). To test the potential viability of both hypotheses for the maintenance of dimorphism, we studied parental care and foraging behavior of the Blue-footed Booby (Sula nebouxii) in two colonies in the Gulf of California, Mexico. Proportion of time spent at the nest, feeding frequency, and time devoted to nest defense were used as indicators of parental care. Foraging ecology was evaluated through the number and duration of foraging trips, proportion of time dedicated to flight and to active feeding, rate and depth of diving, and diet. We found some inter-sex differences in foraging only under high demand conditions, such as food shortage or large broods. Inconsistent inter-sex differences seem to be part of a strategy to maximize chick rearing under a variable environmental regime.

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Acknowledgments

Betty Ann Schreiber kindly provided the data loggers. CONACYT (SEP-2004-C01-45995) and CICESE funded our field work. CONACYT also supported J.A.C.-G. through a scholarship. Aaron Aguilar, Marco A. Gonzalez-Bernal and his family provided logistic support. Aaron Aguilar, Miguel Prado, Erik A. Peñaloza and Fabiola Cárdenas assisted during field work. Jill Awkerman,Guillermo Fernández and Will Stein provided editorial advice. We are grateful to all of them. Fieldwork carried out for this study complied with applicable Mexican laws (permits SGPA/DGVS/00610, SGPA/DGVS/08203, and SGPA/DGVS/08089/06 to E. Mellink).

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Authors and Affiliations

  1. Centro de Investigación Científica y de Educación Superior de Ensenada, B.C. Apdo. postal 2732, Ensenada, BC, México

    José Alfredo Castillo-Guerrero & Eric Mellink

  2. Unidad Académica Mazatlán, Instituto de Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, Apartado Postal 811, 82040, Mazatlán, Sinaloa, México

    José Alfredo Castillo-Guerrero

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  1. José Alfredo Castillo-Guerrero
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Correspondence to Eric Mellink.

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Communicated by P. H. Becker.

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Castillo-Guerrero, J.A., Mellink, E. Occasional inter-sex differences in diet and foraging behavior of the Blue-footed Booby: maximizing chick rearing in a variable environment?. J Ornithol 152, 269–277 (2011). https://doi.org/10.1007/s10336-010-0575-z

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  • DOI: https://doi.org/10.1007/s10336-010-0575-z

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