Journal Title
Title of Journal: J Ornithol
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Abbravation: Journal of Ornithology
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Publisher
Springer-Verlag
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Authors: José Alfredo CastilloGuerrero Eric Mellink
Publish Date: 2010/08/28
Volume: 152, Issue: 2, Pages: 269-277
Abstract
Labor division in parental care and reduction of intersex 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 Bluefooted 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 intersex differences in foraging only under high demand conditions such as food shortage or large broods Inconsistent intersex differences seem to be part of a strategy to maximize chick rearing under a variable environmental regimeBetty Ann Schreiber kindly provided the data loggers CONACYT SEP2004C0145995 and CICESE funded our field work CONACYT also supported JACG through a scholarship Aaron Aguilar Marco A GonzalezBernal and his family provided logistic support Aaron Aguilar Miguel Prado Erik A Peñaloza and Fabiola Cárdenas assisted during field work Jill AwkermanGuillermo 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
Keywords:
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