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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: [email protected]
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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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