Corkscrew seals : grey seal (Halichoerus grypus) infanticide and cannibalism may indicate the cause of spiral lacerations in seals

• Published in: PLOS ONE
• Main Authors: Brownlow, Andrew, Onoufriou, Joseph, Bishop, Amanda, Davison, Nicholas, Thompson, Dave
• Other Authors: University of St Andrews. School of Biology, University of St Andrews. Sea Mammal Research Unit, University of St Andrews. Marine Alliance for Science & Technology Scotland, University of St Andrews. Scottish Oceans Institute
• Format: Article in Journal/Newspaper
• Language: English
• Published: 2016
• Subjects: QH301 Biology; DAS; QH301; North Atlantic
• Online Access: https://hdl.handle.net/10023/8958; https://doi.org/10.1371/journal.pone.0156464

This work was funded by Marine Scotland (http://www.gov.scot/Topics/marine/Publications/TopicSheets/MSScience, project: MMS001/11) and additionally supported by National Capability funding from the Natural Environment Research Council (http://www.nerc.ac.uk/) to the Sea Mammal Research Unit (grant no. SMRU1001). 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. Peer reviewed