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Abundance, distribution and haul-out behaviour of grey seals (Halichoerus grypus) in Cornwall and the Isles of Scilly, UK

Published online by Cambridge University Press:  02 June 2010

Ruth H. Leeney ,
Annette C. Broderick ,
Cheryl Mills ,
Sue Sayer ,
Matthew J. Witt  and
Brendan J. Godley
Ruth H. Leeney*
Affiliation:
Centre for Ecology and Conservation and Peninsula Research Institute for Marine Renewable Energy (PRIMaRE), School of Biosciences, University of Exeter, Cornwall Campus, Penryn, Cornwall TR10 9EZ, UK
Annette C. Broderick
Affiliation:
Centre for Ecology and Conservation and Peninsula Research Institute for Marine Renewable Energy (PRIMaRE), School of Biosciences, University of Exeter, Cornwall Campus, Penryn, Cornwall TR10 9EZ, UK
Cheryl Mills
Affiliation:
Centre for Ecology and Conservation and Peninsula Research Institute for Marine Renewable Energy (PRIMaRE), School of Biosciences, University of Exeter, Cornwall Campus, Penryn, Cornwall TR10 9EZ, UK
Sue Sayer
Affiliation:
Cornwall Seal Group, Copperleaf Cottage, Phillack Hill, Hayle, Cornwall, TR27 5AD, UK
Matthew J. Witt
Affiliation:
Centre for Ecology and Conservation and Peninsula Research Institute for Marine Renewable Energy (PRIMaRE), School of Biosciences, University of Exeter, Cornwall Campus, Penryn, Cornwall TR10 9EZ, UK
Brendan J. Godley
Affiliation:
Centre for Ecology and Conservation and Peninsula Research Institute for Marine Renewable Energy (PRIMaRE), School of Biosciences, University of Exeter, Cornwall Campus, Penryn, Cornwall TR10 9EZ, UK
*
Correspondence should be addressed to: Ruth H Leeney, Provincetown Center for Coastal Studies, 5 Holway Avenue, MA 02657, USA email: [email protected]
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Abstract

This study investigated the phenology, patterns of haul-out habitat use and distribution of the grey seal around Cornwall and the Isles of Scilly. A full census of the coast was carried out by boat over 4 days, in order to make a full count of seals hauled out and close to the coast, and to document all haul-out sites. Regular land-based surveys were made of three haul-out sites in Cornwall, to investigate the effects of spatial, temporal and environmental factors on seal haul-out behaviour. Data from 2004 to 2007 were analysed to describe long-term temporal variation in seal abundance at two haul-out sites. A total of 592 sightings were made along the coast of Cornwall and the Isles of Scilly over the four-day census period; 476 of these sightings (80.4%) were recorded at six main haul-out sites. The highest proportion of seals was observed at three haul-out areas on the Isles of Scilly. In Cornwall, seals were observed in higher numbers on the north coast, where the three largest mainland haul-out sites were documented, than on the south coast. At one key haul-out site in Cornwall, a distinct seasonal pattern was evident in data collected between 2004 and 2007, with higher numbers of seals present during the moulting and breeding seasons than over the summer months. There was considerable inter-annual variability in peak seal abundance, during the moulting season, at this site. There was no significant variation in haul-out behaviour with tidal state at this site, although haul-out counts were generally highest at mid-ebb tides. Data on seal abundance, distribution and haul-out behaviour may aid the designation of Special Areas of Conservation for the protection of grey seals in Cornwall and the Isles of Scilly.

Keywords

abundancedistributionhaul-out behaviourgrey sealsCornwallIsles of Scilly
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 90 , Issue 5 , August 2010 , pp. 1033 - 1040
Copyright
Copyright © Marine Biological Association of the United Kingdom 2010

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References

REFERENCES

Adelung, D., Kierspel, M.A.M., Liebsch, N., Müller, G. and Wilson, R.P. (2006) Distribution of harbour seals in the German bight in relation to offshore wind power plants. In Köller, J., Köppel, J. and Peters, W. (eds) Offshore wind energy. Research on environmental impacts. Heidelberg: Springer, pp. 65–75.CrossRefGoogle Scholar
Austin, D., Bowen, W.D., McMillan, J.I. and Iverson, S.J. (2006) Linking movement, diving and habitat to foraging success in a large marine predator. Ecology 87, 3095–3108.CrossRefGoogle Scholar
Baines, M.E. (1994) Grey seals in West Wales. British Wildlife 5, 341–348.Google Scholar
Barnett, J. and Westcott, S. (1999) Distribution, demographics and survivorship of grey seal pups (Halichoerus grypus) rehabilitated in southwest England. Mammalia 65, 349–361.CrossRefGoogle Scholar
Beck, C.A., Bowen, W.D. and Iverson, S.J. (2003) Sex differences in the seasonal patterns of energy storage and expenditure in a phocid seal. Journal of Animal Ecology 72, 280–291.CrossRefGoogle Scholar
Boily, P. (1995) Theoretical heat flux in water and habitat selection of phocid seals and beluga whales during the annual moult. Journal of Theoretical Biology 172, 235–244.CrossRefGoogle Scholar
Breed, G.A., Bowen, W.D., McMillan, J.I. and Leonard, M.L. (2006) Sexual segregation of seasonal foraging habitats in a non-migratory marine mammal. Proceedings of the Royal Society B 273, 2319–2326.CrossRefGoogle Scholar
Brown, A.E., Burn, A.J., Hopkins, J.J. and Way, S.F. (1997) The Habitats Directive: selection of Special Areas of Conservation in the UK. Joint Nature Conservation Committee Report No. 270, Peterborough.Google Scholar
Council of the European Communities (1992) Council Directive 92/43/EEC of 21 May 1992 on the Conservation of Natural Habitats and of Wild Fauna and Flora. Official Journal of the European Communities, Series L 206, 7–50.Google Scholar
Cronin, M.A., Duck, C.D. and O'Cadhla, O. (2007) Aerial surveying of grey seal breeding colonies on the Blasket Islands, Co. Kerry, Co. Mayo and the Donegal Coast, Ireland. Journal for Nature Conservation 15, 73–83.CrossRefGoogle Scholar
Davies, J.L. (1957) The geography of the gray seal. Journal of Mammalogy 38, 297–310.CrossRefGoogle Scholar
Duck, C. (1995a) Seals. In Barne, J.H, Robson, C.F, Kaznowska, S.S., Davidson, N.C., Doody, J.P. and Buck, A.L. (eds) Coasts and Seas of the United Kingdom (Coastal Directory Series). Region 10 South-west England: Seaton to Roseland Peninsula. Peterborough: Joint Nature and Conservation Committee, p. 120.Google Scholar
Duck, C. (1995b) Seals. In Barne, J.H, Robson, C.F, Kaznowska, S.S., Davidson, N.C., Doody, J.P. and Buck, A.L. (eds) Coasts and Seas of the United Kingdom (Coastal Directory Series). Region 10 South-west England : Seaton to Roseland Peninsula. Peterborough: Joint Nature and Conservation Committee, pp. 146–148.Google Scholar
Edrén, S.M.C., Teilmann, J., Dietz, R. and Carstensen, J. (2004) Effect from the construction of Nysted Offshore Wind Farm on seals in Rødsand seal sanctuary based on remote video monitoring. Technical Report to Energi E2 A/S, Ministry of the Environment, Denmark, 31 pp.Google Scholar
Gerondeau, M., Barbraud, C., Ridoux, V. and Vincent, C. (2007) Abundance estimate and seasonal patterns of grey seal (Halichoerus grypus) occurrence in Brittany, France, as assessed by photo-identification and capture–mark–recapture. Journal of the Marine Biological Association of the United Kingdom 87, 365–372.CrossRefGoogle Scholar
Hall, A.J., Watkins, J. and Hiby, L. (1996) The impact of the 1993 Braer oil spill on grey seals in Shetland. The Science of the Total Environment 186, 119–125.CrossRefGoogle ScholarPubMed
Hamer, D.J. and Goldsworthy, S.D. (2006) Seal–fishery operational interactions: identifying the environmental and operational aspects of a trawl fishery that contribute to by-catch and mortality of Australian fur seals (Arctocephalus pusillus doriferus). Biological Conservation 130, 517–529.CrossRefGoogle Scholar
Hammond, P.S., Hall, A.J. and Prime, J.H. (1994) The diet of grey seals around Orkney and other island and mainland sites in north-eastern Scotland. Journal of Applied Ecology 31, 340–350.CrossRefGoogle Scholar
Härkönen, T., Harding, K.C. and Lunneryd, S.G. (1999) Age- and sex-specific behaviour in harbour seals Phoca vitulina leads to biased estimates of vital population parameters. Journal of Applied Ecology 36, 825–841.CrossRefGoogle Scholar
Harwood, J. (2001) Marine mammals and their environment in the twenty-first century. Journal of Mammalogy 82, 630–640.2.0.CO;2>CrossRefGoogle Scholar
Harvey, V., Côté, S.D. and Hammill, M.O. (2008) The ecology of 3-D space use in a sexually dimorphic mammal. Ecography: Pattern and Diversity on Ecology 31, 371–380.CrossRefGoogle Scholar
Karlsson, O., Hiby, L., Lundberg, T., Jussi, M., Jussi, I. and Helander, B. (2005) Photo-identification, site fidelity, and movement of female gray seals (Halichoerus grypus) between haul-outs in the Baltic sea. Ambio 34, 628–634.CrossRefGoogle ScholarPubMed
Kiely, O., Lidgard, D., Connolly, N. and Bains, M. (2000) Grey Seals: Status and Monitoring in the Irish and Celtic Seas. Maritime Ireland/Wales INTERREG Report No. 3.Google Scholar
Koschinski, S., Culik, B.M., Henriksen, O.D., Tregenza, N.J., Ellis, G., Jansen, C. and Kathe, G. (2003) Behavioural reactions of free-ranging porpoises and seals to the noise of a simulated 2 MW windpower generator. Marine Ecology Progress Series 265, 263–273.CrossRefGoogle Scholar
Leeney, R.H., Amies, R., Broderick, A.C., Witt, M.C., Loveridge, J., Doyle, J. and Godley, B.J. (2008) Spatio-temporal analysis of cetacean strandings and bycatch in a UK fisheries hotspot. Biodiversity and Conservation 17, 2323–2338.CrossRefGoogle Scholar
Leopold, M.F., Werft, B., Ries, E.H., and Reijnders, P.J.H. (1997) The importance of the North Sea for winter dispersal of harbour seals Phoca vitulina from the Wadden Sea. Biological Conservation 81, 97–102.CrossRefGoogle Scholar
Lidgard, D.C., Boness, D.J., Bowen, W.D. and McMillan, J.I. (2005) State-dependant male mating tactics in the grey seal: the importance of body size. Behavioral Ecology 16, 541–549.CrossRefGoogle Scholar
Madsen, P.T., Wahlberg, M., Tougaard, J., Lucke, K. and Tyack, P. (2006) Wind turbine underwater noise and marine mammals: implications of current knowledge and data needs. Marine Ecology Progress Series 309: 279–295.CrossRefGoogle Scholar
Matthiopoulos, J., McConnell, B., Duck, C. and Fedak, M. (2004) Using satellite telemetry and aerial counts to estimate space use by grey seals around the British Isles. Journal of Applied Ecology 41, 476–491.CrossRefGoogle Scholar
McConnell, B.J., Fedak, M.A., Lovell, P. and Hammond, P.S. (1999) Movements and foraging areas of grey seals in the North Sea. Journal of Applied Ecology 36, 573–590.CrossRefGoogle Scholar
McMath, A.J. and Stringell, T.B. (2006) Grey seal pup production in Wales. SCOS Briefing Paper 06/11, in SCOS 2006. http://www.smru.st-andrews.ac.uk/documents/SCOS_06.pdfGoogle Scholar
Mills, C.A. (2007) Factors influencing haul-out behaviour of grey seals (Halichoerus grypus) in Cornwall, UK. MSc thesis. Centre for Ecology and Conservation, University of Exeter, Cornwall Campus, UK.Google Scholar
Morizur, Y., Berrow, S.D., Tregenza, N.J.C., Couperus, A.S. and Pouvreau, S. (1999) Incidental catches of marine mammals in pelagic trawl fisheries of the northeast Atlantic. Fisheries Research 41, 297–307.CrossRefGoogle Scholar
Northridge, S.P. (1991) An updated world review of interactions between marine mammals and fisheries. Food and Agriculture Organisation, Fisheries Technical Paper, Rome, No. 251, Supplement 1.Google Scholar
Parsons, K.M., Piertney, S.B., Middlemas, S.J, Hammond, P.S. and Armstrong, J.D. (2005) DNA-based identification of salmonid prey species in seal faeces. Journal of the Zoological Society of London 266, 275–281.CrossRefGoogle Scholar
Pauli, B.D. and Terhune, J.M. (1987) Tidal and temporal interaction on harbor seal haul-out patterns. Aquatic Mammals 13, 93–95.Google Scholar
Prime, J.H. (1985) The current status of the grey seal Halichoerus grypus in Cornwall, England. Biological Conservation 33, 81–87.CrossRefGoogle Scholar
Prime, J.H. and Hammond, P.S. (1990) The diet of grey seals from the south-western North Sea assessed from analyses of hard parts found in faeces. Journal of Applied Ecology 27, 435–447.CrossRefGoogle Scholar
R Development Core Team (2007) R: A language and environment for statistical computing. Vienna, Austria: R Foundation for Statistical Computing. ISBN 3-900051-07-0, URL http://www.R-project.orgGoogle Scholar
Reder, S., Lydersen, C., Arnold, W. and Kovacs, K.M. (2003) Haul-out behaviour of High Arctic harbour seals (Phoca vitulina vitulina) in Svalbard, Norway. Polar Biology 27, 6–16.CrossRefGoogle Scholar
Ridoux, V., Spitz, J., Vincent, C. and Walton, M.J. (2007) Grey seal diet at the southern limit of its European distribution: combining dietary analyses and fatty acid profiles. Journal of the Marine Biological Association of the United Kingdom 87, 255–264.CrossRefGoogle Scholar
Schneider, D.C. and Payne, P.M. (1983) Factors affecting haul-out of harbour seals at a site in southeastern Massachusetts. Journal of Mammalogy 64, 518–520.CrossRefGoogle Scholar
Sergio, F., Newton, I. and Marchesi, L. (2005) Top predators and biodiversity. Nature 436, 192.CrossRefGoogle ScholarPubMed
Sjöberg, M. and Ball, J.P. (2000) Grey seal, Halichoerus grypus, habitat selection around haul-out sites in the Baltic Sea: bathymetry or central-place foraging? Canadian Journal of Zoology 78, 1661–1667.CrossRefGoogle Scholar
Southwest of England Regional Development Agency (2006) South West of England Regional Development Agency Wave Hub Non-Technical Summary June 2006. Exeter: Halcrow Group Limited, 22 pp.Google Scholar
Special Committee on Seals (SCOS), SMRU (2008) Scientific Advice on Matters Related to the Management of Seal Populations: 2008. 98 pp.Google Scholar
Steven, G.A. (1932) A short investigation into the habits, abundance and species of seals on the North Cornwall Coast. Report to the Ministry of Agriculture and Fisheries, 30 December.Google Scholar
Summers, C.F. (1974) The grey seal (Halichoerus grypus) in Cornwall and the Isles of Scilly. Biological Conservation 6, 285–291.CrossRefGoogle Scholar
Summers, C.F. (1978) Trends in the size of British grey seal populations. Journal of Applied Ecology 15, 395–400.CrossRefGoogle Scholar
Thompsen, F., Lüdemann, K., Kafemann, R. and Piper, W. (2006) Effects of offshore wind farm noise on marine mammals and fish. Report to Biola, Hamburg, Germany on behalf of COWRIE Ltd, 62 pp.Google Scholar
Thompson, D., Hammond, P.S., Nicholas, K.S. and Fedak, M.A. (1991) Movements, diving and foraging behavior of grey seals (Halichoerus grypus). Journal of Zoology (London) 224, 223–232.CrossRefGoogle Scholar
Thompson, P.M., Tollit, D.J., Wood, D., Corpe, H.M., Hammond, P.S. and Mackay, A. (1997) Estimating harbor seal abundance and status in an estuarine habitat in north-east Scotland. Journal of Applied Ecology 34, 43–52.CrossRefGoogle Scholar
Vincent, C., Meynier, L. and Ridoux, V. (2001) Photo-identification in grey seals: legibility and stability of natural markings. Mammalia 65, 363–372.CrossRefGoogle Scholar
Vincent, C., Fedak, M.A., McConnell, B.J., Meynier, L., Saint-Jean, C. and Ridoux, V. (2005) Status and conservation of the grey seal, Halichoerus grypus, in France. Biological Conservation 126, 62–73.CrossRefGoogle Scholar
Westcott, S. (1997) The grey seals of the west country. Truro: Cornwall Wildlife Trust.Google Scholar
Westcott, S. (2008) Procedural guidelines for studying grey seals in southwest England, 2006. Natural England Research Report NERR017, 100 pp.Google Scholar
Witt, M.J. and Godley, B.J. (2007) A step towards seascape scale conservation: using vessel monitoring systems (VMS) to map fishing activity. PLoS One 2, e1111.CrossRefGoogle ScholarPubMed
Wolkers, H., Van Bavel, B., Derocher, A., Wiig, O., Kovacs, K.M., Lyderson, C. and Lindstrom, G. (2004) Congener-specific accumulation and food chain transfer of polybrominated diphenyl ethers in two Arctic food chains. Environmental Science and Technology 38, 1667–1674.CrossRefGoogle ScholarPubMed
Yodzis, P. (2001) Must top predators be culled for the sake of fisheries? Trends in Ecology and Evolution 16, 78–84.CrossRefGoogle ScholarPubMed