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Monitoring important coastal sites for bottlenose dolphin in Cardigan Bay, UK

Published online by Cambridge University Press:  21 July 2009

Chris Pierpoint ,
Liz Allan ,
Holly Arnold ,
Peter Evans ,
Sarah Perry ,
Lizzie Wilberforce  and
Janet Baxter
Chris Pierpoint*
Affiliation:
Eurydice, 1 Castle Green, Jerico, Dinas Cross, Pembrokeshire, SA42 0UT, UK
Liz Allan
Affiliation:
Ceredigion County Council, Penmorfa, Aberaeron, Ceredigion, SA46 0PA, UK
Holly Arnold
Affiliation:
Ceredigion County Council, Penmorfa, Aberaeron, Ceredigion, SA46 0PA, UK
Peter Evans
Affiliation:
Sea Watch Foundation, Cynifryn, Abershore, Llanfaglan, Caernarfon, Gwynedd, LL54 5RA, UK
Sarah Perry
Affiliation:
Cardigan Bay Marine Wildlife Centre, Glanmor Terrace, New Quay, Ceredigion, SA45 9PS, UK
Lizzie Wilberforce
Affiliation:
The Wildlife Trust of South and West Wales, The Nature Centre, Fountain Road, Tondu, Bridgend, CF32 0EH, UK
Janet Baxter
Affiliation:
Friends of Cardigan Bay, Northlands, Ynyslas, Ceredigion, SY24 5JZ, UK
*
Correspondence should be addressed to: C.J.L Pierpoint, Eurydice, 1 Castle Green, Jerico, Dinas Cross, Pembrokeshire, SA42 0UT, UK email: cp@eurydice.co.uk
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Abstract

From 1994–2007 Ceredigion County Council and a network of shore-based, volunteer observers monitored levels of boat traffic and the occurrence of bottlenose dolphins Tursiops truncatus at seven sites on the coast of Cardigan Bay, Wales. We report high rates of site use and site occupancy by this species during the summer: at Mwnt for example, dolphins were recorded in >80% of 2 hours' observation periods; and at New Quay Harbour dolphins were present in >30% of all 15-minute intervals. At Mwnt and Aberporth there was a significant annual trend for increasing sighting rates; at Ynys Lochtyn a positive trend was only marginally non-significant; at New Quay Bird's Rock the trend was ambiguous but appeared stable over the seven most recent years. Although trends in site use may not reflect population trends in the wider region, these data were consistent with recent abundance estimates that indicate that the number of bottlenose dolphins using Cardigan Bay is stable or slightly increasing. Average group size at our study sites was small (<3 animals), which contrasts with observations of larger schools of the same population elsewhere in their range. The predominant behaviour in coastal Cardigan Bay is demersal foraging, often by solitary animals in shallow near-shore habitats. There was evidence that boat traffic suppressed site use by dolphins at New Quay Harbour, the busiest monitoring site: sighting rates fell when high numbers of boats were present and sighting rates were higher in 2007 than in previous years, when boat use was reduced due to poor weather during the main tourist season. This study demonstrates that networks of volunteer observers can provide a cost-effective, non-invasive means of gathering data on marine mammals for the purposes of coastal zone management.

Keywords

bottlenose dolphinTursiops truncatushabitat useboat disturbancebehaviourshore-based monitoringvolunteer observers
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 89 , Special Issue 5: Cetaceans , August 2009 , pp. 1033 - 1043
Copyright
Copyright © Marine Biological Association of the United Kingdom 2009

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References

REFERENCES

Arnold, H. (1993) Distribution, abundance, and habitat use of bottle-nosed dolphins in Cardigan Bay, Wales, 1992. European Research on Cetaceans 7, 63–66.Google Scholar
Bristow, T. (2004) Changes in coastal usage by bottlenose dolphins (Tursiops truncatus) in Cardigan Bay, Wales. Aquatic Mammals 30, 398–404.CrossRefGoogle Scholar
Campbell, G.S., Bilgre, B.A. and Defran, R.H. (2002) Bottlenose dolphins (Tursiops truncatus) in Turneffe Atoll, Belize: occurrence, site fidelity, group size, and abundance. Aquatic Mammals 28, 170–180.Google Scholar
CCC (2008) Cardigan Bay Special Area of Conservation (SAC) draft management scheme. Aberaeron: Ceredigion County Council, 179 pp.Google Scholar
Connor, R.C., Wells, R.S., Mann, J. and Read, A.J. (2000) The bottlenose dolphin: social relationships in a fission-fusion society. In Mann, J., Connor, R.C., Tyack, P.L. and Whitehead, H. (eds) Cetacean societies: field studies of dolphins and whales. Chicago, IL: University of Chicago Press, pp. 91–126.Google Scholar
Conover, W.J. (1999) Practical nonparametric statistics. 3rd edition. New York: Wiley.Google Scholar
Constantine, R., Brunton, D.H. and Dennis, T. (2004) Dolphin-watching tour boats change bottlenose dolphin (Tursiops truncatus) behaviour. Biological Conservation 117, 299–307.CrossRefGoogle Scholar
Cuzick, J. (1985) A Wilcoxon-type test for trend. Statistics in Medicine 4, 87–89.CrossRefGoogle ScholarPubMed
Evans, P.G.H., Baines, M.E. and Shepherd, B. (2000) Bottlenose dolphin prey and habitat sampling trials. Report to the Countryside Council for Wales. Sea Watch Foundation, Oxford, 67 pp.Google Scholar
Evans, P.G.H., Baines, M.E., Shepherd, B. and Reichelt, M. (2002) Studying bottlenose dolphin (Tursiops truncatus) abundance, distribution, habitat use and home range size in Cardigan Bay: implications for SAC management. In Abstracts, 16th Annual Conference of the European Cetacean Society Liege, Belgium, 7–11 April 2002, p. 12.Google Scholar
Evans, P.G.H., Anderwald, P. and Baines, M.E. (2003) UK Cetacean Status Review. Report to English Nature & Countryside Council for Wales. Sea Watch Foundation, Oxford, 162 pp.Google Scholar
Gregory, P.R. and Hartley, S.W.A. (2001) Preliminary study into estimating bottlenose dolphin (Tursiops truncatus) population size in Cardigan Bay, west Wales (cSAC). Report to the Countryside Council for Wales, 33 pp. & appendices.Google Scholar
Grellier, K., Arnold, H., Thompson, P., Wilson, B. and Curren, S. (1995) Management recommendations for the Cardigan Bay bottlenose dolphin population. Contract Science Report 134, Countryside Council for Wales, Bangor, 68 pp.Google Scholar
Harzen, S. (1998) Habitat use by the bottlenose dolphin (Tursiops truncatus) in the Sado Estuary, Portugal. Aquatic Mammals 24, 117–128.Google Scholar
Hastie, G.D., Wilson, B., Wilson, L.J., Parsons, K.M. and Thompson, P.M. (2004) Functional mechanisms underlying cetacean distribution patterns: hotspots for bottlenose dolphins are linked to foraging. Marine Biology 144, 397–403.CrossRefGoogle Scholar
Ingram, S.N. (2000) The ecology and conservation of bottlenose dolphins in the Shannon Estuary, Ireland. PhD thesis. University College Cork, Ireland.Google Scholar
Ingram, S.N. and Rogan, E. (2002) Identifying critical areas and habitat preferences of bottlenose dolphins Tursiops truncatus. Marine Ecology Progress Series 244, 247–255.CrossRefGoogle Scholar
Janik, V.M. and Thompson, P.M. (1996) Changes in surfacing patterns of bottlenose dolphins in response to boat traffic. Marine Mammal Science 12, 597–602.CrossRefGoogle Scholar
Kerr, K.A., Defran, R.H. and Campbell, G.S. (2005) Bottlenose dolphins (Tursiops truncatus) in the Drowned Cayes, Belize: group size, site fidelity and abundance. Caribbean Journal of Science 41, 172–177.Google Scholar
Lamb, J. (2004) Relationships between presence of bottlenose dolphins, environmental variables and boat traffic; visual and acoustic surveys in New Quay Bay, Wales. MSc dissertation. University of Wales, 80 pp.Google Scholar
Lewis, E.J. (1991) An ecological study of the Atlantic bottlenose dolphin (Tursiops truncatus) in Cardigan Bay. BSc project. Leeds University, UK.Google Scholar
Lewis, E.J. and Evans, P.G.H. (1993) Comparative ecology of bottlenose dolphins (Tursiops truncatus) in Cardigan Bay and the Moray Firth. European Research on Cetaceans 7, 57–62.Google Scholar
Liret, C., Allali, P., Creton, P., Guinet, C. and Ridoux, V. (1994) Foraging activity of bottlenose dolphin around Ile de Sein, France and its relationship to environmental parameters. European Research on Cetaceans 8, 188–191.Google Scholar
Lott, R. (2004) Group size, social associations and resident patterns of bottlenose dolphins (Tursiops truncatus) in Cardigan Bay, Wales. MSc dissertation. University College North Wales, 97 pp.Google Scholar
Lusseau, D. (2003) The effects of tour boats on the behavior of bottlenose dolphins: using Markov chains to model anthropogenic impacts. Conservation Biology 17, 1785–1793.CrossRefGoogle Scholar
Mayer, S.J. and Arnold, H.C. (1991) Bottlenose dolphins (Tursiops truncatus) in Cardigan Bay, West Wales. Proceedings of Cardigan Bay in Crisis? Conference, Snowdonia National Park Authority, pp. 34–35.Google Scholar
Mayer, S.J., Arnold, H.C. and Evans, P.G.H. (1991) Preliminary findings from a photo-identification study of bottle-nosed dolphins (Tursiops truncatus) in Cardigan Bay, Wales, during 1990. European Research on Cetaceans 5, 45–46.Google Scholar
Morris, R.J. (1991) The New Quay dolphins: a study of the natural history and behaviour of a wild, resident group of dolphins living off the west coast of Wales in an area of considerable human activity. Report to the World Wide Fund for Nature (WWF), 141 pp.Google Scholar
Nowacek, S.M., Wells, R.S. and Solow, A.R. (2001) Short-term effects of boat traffic on bottlenose dolphins, Tursiops truncatus, in Sarasota Bay, Florida. Marine Mammal Sciience 17, 673–688.CrossRefGoogle Scholar
Pesante, G., Evans, P.G.H., Anderwald, P., Powell, D. and McMath, M. (2008a) Connectivity of bottlenose dolphins in Wales: North Wales Photo-Monitoring Interim Report. CCW Marine Monitoring Report, 62, Countryside Council for Wales, Bangor, 42 pp.Google Scholar
Pesante, G., Evans, P.G.H., Baines, M.E. and McMath, M. (2008b) Abundance and life history parameters of bottlenose dolphin in Cardigan Bay: monitoring 2005–2007. CCW Marine Monitoring Report, 61, Countryside Council for Wales, Bangor, 81 pp.Google Scholar
Pierpoint, C. and Allan, L. (2000) Cetacean site use & boat traffic on the Ceredigion Marine Heritage Coast 1994–99. Cyngor Sir Ceredigion, 49 pp.Google Scholar
Pierpoint, C. and Allan, L. (2001) Cetacean site use at New Quay on the Ceredigion Marine Heritage Coast, West Wales 2000. Cyngor Sir Ceredigion, 14 pp.Google Scholar
Pierpoint, C. and Allan, L. (2002) Cetacean site use & boat traffic on the Ceredigion Marine Heritage Coast in 2001. Cyngor Sir Ceredigion, 33 pp.Google Scholar
Pierpoint, C. and Allan, L. (2004) Bottlenose dolphins & boat traffic on the Ceredigion Marine Heritage Coast, West Wales 2002 & 2003. Cyngor Sir Ceredigion, 44 pp.Google Scholar
Pierpoint, C. and Allan, L. (2006) Bottlenose dolphins & boat traffic on the Ceredigion Marine Heritage Coast, West Wales 2004 & 2005. Cyngor Sir Ceredigion, 55 pp.Google Scholar
Rossbach, K.A. and Herzing, D.L. (1997) Underwater observations of benthic feeding bottlenose dolphins (Tursiops truncatus) near Grand Bahama Island, Bahamas. Marine Mammal Science 13, 498–503.CrossRefGoogle Scholar
Scott, M.D. and Chivers, S.J. (1990) Distribution and herd structure of bottlenose dolphins in the eastern tropical Pacific Ocean. In Leatherwood, S. and Reeves, R.R. (eds) The bottlenose dolphin. San Diego, CA: Academic Press, pp. 387–402.CrossRefGoogle Scholar
Shane, S. (1990) Comparison of bottlenose dolphin behaviour in Texas and Florida, with a critique of methods for studying dolphin behaviour. In Leatherwood, S. and Reeves, R. (eds) The bottlenose dolphin. San Diego, CA: Academic Press, pp. 541–558.CrossRefGoogle Scholar
Stockin, K.A., Lusseau, D., Binedell, V., Wiseman, N. and Orams, M.B. (2008) Tourism affects the behavioural budget of the common dolphin Delphinus sp. in the Hauraki Gulf, New Zealand. Marine Ecology Progress Series 355, 287–295.CrossRefGoogle Scholar
Thompson, P.M., Tufft, N.S., Grellier, K. and Durban, J.W. (2000) Evaluation of techniques for monitoring the abundance and behaviour of bottlenose dolphins—the Kessock channel as a case study. Scottish Natural Heritage Commissioned Report No. F99LE01, 46 pp.Google Scholar
Thompson, P.M., Lusseau, D., Corkrey, R. and Hammond, P.S. (2004) Moray Firth bottlenose dolphin monitoring strategy options. Scottish Natural Heritage Commissioned Report No. 079 (ROAME No. F02AA409), 60 pp.Google Scholar
Ugarte, F. and Evans, P.G.H. (2006) Monitoring of marine mammals in the Cardigan Bay SAC: surveys from May 2003 to April 2005. Countryside Council for Wales, Marine Monitoring Report 23, SCF Report: 04/01/04, 31 pp.Google Scholar
Wells, R.S., Irvine, A.B. and Scott, M.D. (1980) The social ecology of inshore odontocetes. In Herman, L.M. (ed.) Cetacean behaviour: mechanisms and functions. New York: John Wiley & Sons, pp. 263–317.Google Scholar
Wilson, B. (1995) The ecology of bottlenose dolphins in the Moray Firth, Scotland: a population at the northern extreme of the species' range. PhD thesis. University of Aberdeen, Scotland, 201 pp.Google Scholar
Würsig, B. and Würsig, M. (1979) Behaviour and ecology of the bottlenose dolphin, Tursiops truncatus, in the South Atlantic. Fishery Bulletin 77, 399–412.Google Scholar
Yazdi, P. (2005) Einfluss der Tourismusboote auf das Verhalten und die Energetik der Großen Tümmler (Tursiops truncatus) vor der Insel Choros, Chile. PhD thesis. Christian-Albrechts-Universität, Kiel, Germany, 198 pp.Google Scholar