title: Corkscrew Seals: Grey Seal (Halichoerus grypus) Infanticide and Cannibalism May Indicate the Cause of Spiral Lacerations in Seals.
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.
authors.affiliation: Scottish Marine Animal Stranding Scheme, SAC Veterinary Services Drummondhill, Stratherrick Road, Inverness, IV2 4JZ, United Kingdom.
authors.forename: Andrew
authors.initials: A
authors.lastname: Brownlow
authors.affiliation: Sea Mammal Research Unit, University of St Andrews, St Andrews, Fife, KY16 8LB, United Kingdom.
authors.forename: Joseph
authors.identifier: http://orcid.org/0000-0001-5509-9667
authors.initials: J
authors.lastname: Onoufriou
authors.affiliation: Durham University, School of Biology and Biomedical Sciences, Durham, DH1 3LE, United Kingdom.
authors.forename: Amanda
authors.initials: A
authors.lastname: Bishop
authors.affiliation: Scottish Marine Animal Stranding Scheme, SAC Veterinary Services Drummondhill, Stratherrick Road, Inverness, IV2 4JZ, United Kingdom.
authors.forename: Nicholas
authors.initials: N
authors.lastname: Davison
authors.affiliation: Sea Mammal Research Unit, University of St Andrews, St Andrews, Fife, KY16 8LB, United Kingdom.
authors.forename: Dave
authors.initials: D
authors.lastname: Thompson
mesh_terms: D000818:Animals; D001267:Atlantic Ocean; D002190:Cannibalism; D006801:Humans; D007231:Infant, Newborn; D007237:Infanticide; D022125:Lacerations / Q000503:physiopathology*; D046048:Seals, Earless / Q000502:physiology*