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Please use this identifier to cite or link to this item: http://hdl.handle.net/10023/3076
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Title: Spatial variation in foraging behaviour of a marine top predator (Phoca vitulina) determined by a large-scale satellite tagging program
Authors: Sharples, Ruth Jemma
Moss, Simon E
Patterson, Toby A
Hammond, Philip Steven
Keywords: Ecology
Harbour seal
QL Zoology
Issue Date: 21-May-2012
Citation: Sharples , R J , Moss , S E , Patterson , T A & Hammond , P S 2012 , ' Spatial variation in foraging behaviour of a marine top predator (Phoca vitulina) determined by a large-scale satellite tagging program ' PLoS One , vol 7 , no. 5 , e37216 .
Abstract: The harbour seal (Phoca vitulina) is a widespread marine predator in Northern Hemisphere waters. British populations have been subject to rapid declines in recent years. Food supply or inter-specific competition may be implicated but basic ecological data are lacking and there are few studies of harbour seal foraging distribution and habits. In this study, satellite tagging conducted at the major seal haul outs around the British Isles showed both that seal movements were highly variable among individuals and that foraging strategy appears to be specialized within particular regions. We investigated whether these apparent differences could be explained by individual level factors: by modelling measures of trip duration and distance travelled as a function of size, sex and body condition. However, these were not found to be good predictors of foraging trip duration or distance, which instead was best predicted by tagging region, time of year and inter-trip duration. Therefore, we propose that local habitat conditions and the constraints they impose are the major determinants of foraging movements. Specifically the distance to profitable feeding grounds from suitable haul-out locations may dictate foraging strategy and behaviour. Accounting for proximity to productive foraging resources is likely to be an important component of understanding population processes. Despite more extensive offshore movements than expected, there was also marked fidelity to the local haul-out region with limited connectivity between study regions. These empirical observations of regional exchange at short time scales demonstrates the value of large scale electronic tagging programs for robust characterization of at-sea foraging behaviour at a wide spatial scale.
Version: Publisher PDF
Status: Peer reviewed
URI: http://hdl.handle.net/10023/3076
DOI: http://dx.doi.org/10.1371/journal.pone.0037216
ISSN: 1932-6203
Type: Journal article
Rights: © 2012 Sharples et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Appears in Collections:NERC Sea Mammal Research Unit (SMRU) Research
Scottish Oceans Institute Research
Centre for Research into Ecological & Environmental Modelling (CREEM) Research
Biology Research
University of St Andrews Research



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