Abstract
Energy management during the breeding season is crucial for central place foragers since parents need to feed themselves and their offspring while being spatially and temporally constrained. In this work, we used overall dynamic body acceleration as a measure of activity and also to allude to the foraging energy expenditure of breeding Imperial cormorants Phalacrocorax atriceps. We also analyzed how changes in the time or energy allocated to different activities affected the foraging trip energy expenditure and estimated the daily food requirements of the species. Birds spent 42 % of the total energy flying to and from the feeding areas and 16 % floating at sea. The level of activity underwater was almost 1.5 times higher for females than for males. The most expensive diving phase in terms of rate of energy expenditure was descending though the water column. The total foraging trip energy expenditure was particularly sensitive to variation in the amount of time spent flying. During the breeding season, adult cormorants breeding along the Patagonian coast would consume approximately 10,000 tons of food.
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Acknowledgments
This research was funded by grants from the Wildlife Conservation Society, Consejo Nacional de Investigaciones Científicas y Técnicas de la República Argentina (CONICET) and Agencia de Promoción Científica y Tecnológica to F. Quintana and by a Rolex Award for Enterprise awarded to R.P. Wilson. We would like to thank the Organismo Provincial de Turismo for the permits to work in Punta León and the Centro Nacional Patagónico (CENPAT-CONICET) for institutional and logistical support. A. Gómez-Laich is supported by a Postdoctoral fellowship from the Consejo Nacional de Investigaciones Científicas y Técnicas de la República Argentina (CONICET).
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Gómez-Laich, A., Wilson, R.P., Shepard, E.L.C. et al. Energy expenditure and food consumption of foraging Imperial cormorants in Patagonia, Argentina. Mar Biol 160, 1697–1707 (2013). https://doi.org/10.1007/s00227-013-2222-8
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DOI: https://doi.org/10.1007/s00227-013-2222-8