Stomach temperature telemetry reveals temporal patterns of foraging success in a free-ranging marine mammal

The Journal of Animal Ecology
Deborah AustinD J Boness

Abstract

1. We studied feeding frequency in free-ranging grey seals using stomach temperature telemetry to test if previously reported sex differences in the diving, movement and diet were reflected in the temporal pattern of foraging success. 2. Data were retrieved from 21 of 32 grey seals from 1999 to 2001, totalling 343 days and 555 feeding events, with individual record length varying from 2 to 40 days (mean: 16.33 +/- 2.67 days/seal). 3. Seals fed on 57.8 +/- 6.46% of days sampled and had an average of 1.7 +/- 0.26 meals per day, but individual variability was apparent in the temporal distribution of feeding as evidenced by high coefficients of variation (coefficient of variation = 69.0%). 4. Bout analysis of non-feeding intervals of six grey seals suggests that feeding intervals of individuals were varied and probably reflect differences in prey availability. Grey seals tended to have many single feeding events with long periods separating each event, as would be expected for a large carnivore with a batch-reactor digestive system. 5. We found significant sex differences in the temporal distribution of feeding. The number of feeding events per day was greater in males (2.2 +/- 0.4 vs. 1.0 +/- 0.2), as was time associated with feed...Continue Reading

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Citations

Jan 24, 2013·Proceedings of the National Academy of Sciences of the United States of America·Yuuki Y Watanabe, Akinori Takahashi
May 3, 2007·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·David A S RosenLisa A Hoopes
May 15, 2013·PloS One·Mark JessoppTom Hart
Jul 1, 2009·The Journal of Animal Ecology·Toby A PattersonJohn S Gunn
Jul 29, 2008·The Journal of Animal Ecology·Sophie BestleyJohn S Gunn
Aug 3, 2010·The Journal of Animal Ecology·P W RobinsonD P Costa
Aug 14, 2012·The Journal of Animal Ecology·Michele ThumsMark A Hindell
Apr 21, 2017·Photochemistry and Photobiology·Jade Vacquié-GarciaChristophe Guinet
Apr 14, 2017·Royal Society Open Science·Kenady WilsonAndrew Read
Jul 12, 2014·The Journal of Experimental Biology·Yuuki KawabataKiyoshi Soyano
Nov 3, 2006·The Journal of Experimental Biology·Carey E Kuhn, Daniel P Costa

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