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Drift diving by hooded seals (Cystophora cristata) in the Northwest Atlantic Ocean

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Author(s)

Julie Andersen, Garry Stenson, Mette Skern-Maurizen, Yolanda Wiersma , Aqqalu Rosing-Asvid, Lars Boehme, Mike Hammill

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Abstract

Many pinniped species perform a specific dive type, referred to as a ‘drift dive’, where they drift passively through the water column. This dive type has been suggested to function as a resting/sleeping or food processing dive, and can be used as an indication of feeding success by calculating the daily change in vertical drift rates over time, which reflects the relative fluctuations in buoyancy of the animal as the proportion of lipids in the body change. Northwest Atlantic hooded seals perform drift dives at regular intervals throughout their annual migration across the Northwest Atlantic Ocean. We found that the daily change in drift rate varied with geographic location and the time of year and that this differed between sexes. Positive changes in buoyancy (reflecting increased lipid stores) were evident throughout their migration range and although overlapping somewhat, they were not statistically associated with high use areas as indicated by First Passage Time (FPT). Differences in the seasonal fluctuations of buoyancy between males and females suggest that they experience a difference in patterns of energy gain and loss during winter and spring, associated with breeding. The fluctuations in buoyancy around the moulting period were similar between sexes.
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Details

Original languageEnglish
Article numbere103072
Number of pages11
JournalPLoS One
Volume9
Issue number7
DOIs
Publication statusPublished - 22 Jul 2014

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