Entanglement of grey seals Halichoerus grypus at a haul out site in Cornwall,UK |
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| Institution: | 1. School of Geography, Earth and Environmental Sciences, University of Plymouth, Drake Circus, Plymouth PL4 8AA, UK;2. The Lost At Sea Project, Old Bridge House, Porth Bean Road, Newquay TR7 3LU, UK;1. Pacific Research Fisheries Center (TINRO-Center), Vladivostok, Russia;2. V.I. Il''ichev Pacific Oceanological Institute (POI), Far Eastern Branch, Russian Academy of Science, Vladivostok, Russia |
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| Abstract: | Entanglement in marine debris has been internationally recognised as a potential threat to marine species. Sightings records and a photo identification catalogue from a haul out site in southwest England were used to establish entanglement records for grey seals Halichoerus grypus. Between 2004 and 2008 the annual mean entanglement rates varied from 3.6% to 5%. The maximum recapture period for entangled seals compared to paired control seals was significantly less (p = 0.045) suggesting an increased mortality rate for affected seals. Of the 58 entangled cases in the catalogue, 64% had injuries that were deemed serious. Of the 15 cases where the entangling debris was visible, 14 were entangled in fisheries materials. The entanglement reported at this site could indicate a high rate of mortality and should be monitored carefully. On a more immediate level, entanglement represents a welfare issue for the affected animals. |
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