Abstract.
Bird-borne data loggers were used to investigate the foraging strategies of Brünnich's guillemots breeding in a colony in the North Water Polynya: the flight performance and diving activity of incubating birds were compared to those of chick-rearing individuals. No significant differences were recorded between the bird groups in the potential foraging range. Conversely, clear differences were revealed between incubating and chick-rearing birds in diving behaviour. Chick-rearing birds were generally foraging at a significantly greater depth, and spent significantly higher proportions of the time submerged, than brooding individuals. Despite these differences, the estimated average daily energy expenditure of chick-rearing Brünnich's guillemots was only about 6% higher than that during incubation.
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Benvenuti, S., Dall'Antonia, L. & Falk, K. Diving behaviour differs between incubating and brooding Brünnich's guillemots, Uria lomvia. Polar Biol 25, 474–478 (2002). https://doi.org/10.1007/s00300-002-0372-0
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DOI: https://doi.org/10.1007/s00300-002-0372-0