Andrew Brownlow
Corkscrew Seals: Grey Seal (Halichoerus grypus) Infanticide and Cannibalism May Indicate the Cause of Spiral Lacerations in Seals
Brownlow, Andrew; Onoufriou, Joseph; Bishop, Amanda; Davison, Nicholas; Thompson, Dave
Authors
Joseph Onoufriou
Amanda Bishop
Nicholas Davison
Dave Thompson
Abstract
Large numbers of dead seals with characteristic spiral lesions have been washing ashore around the North Atlantic over the past two decades. Interactions with ship propellers and shark predation have been suggested as the likely causal mechanisms. However, new evidence points towards a more likely candidate: grey seal predation. An adult male grey seal was observed and recorded catching, killing and eating five weaned grey seal pups over a period of one week on the Isle of May, Scotland. A further 9 carcasses found in the same area exhibited similar injuries. Post mortem analysis of lesions indicated the wound characteristics were similar to each other and in 12 of the 14 carcasses analysed, were indistinguishable from carcasses previously attributed to propeller interaction. We therefore propose that most of the seal carcasses displaying spiral lacerations in the UK are caused by grey seal predation. Cases in other locations should be re-evaluated using the scoring system presented here to identify whether grey seal predation is a major cause of mortality in phocid seals.
Citation
Brownlow, A., Onoufriou, J., Bishop, A., Davison, N., & Thompson, D. (2016). Corkscrew Seals: Grey Seal (Halichoerus grypus) Infanticide and Cannibalism May Indicate the Cause of Spiral Lacerations in Seals. PLoS ONE, 11(6), Article e0156464. https://doi.org/10.1371/journal.pone.0156464
Journal Article Type | Article |
---|---|
Acceptance Date | May 13, 2016 |
Online Publication Date | Jun 2, 2016 |
Publication Date | Jun 2, 2016 |
Deposit Date | May 16, 2018 |
Publicly Available Date | May 16, 2018 |
Journal | PLoS ONE |
Publisher | Public Library of Science |
Peer Reviewed | Peer Reviewed |
Volume | 11 |
Issue | 6 |
Article Number | e0156464 |
DOI | https://doi.org/10.1371/journal.pone.0156464 |
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Copyright Statement
© 2016 Brownlow 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.
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