Harbour Seal Population Assessment in the Republic of Ireland August 2003
Harbour seal population assessment in the Republic of Ireland August 2003 Irish Wildlife Manuals No. 11 Harbour seal population assessment in the Republic of Ireland August 2003 Michelle Cronin 1, Callan Duck 2, Oliver Ó Cadhla 1, Richard Nairn 3, Denis Strong 4, Ciarán O’ Keeffe 5 1. COASTAL AND MARINE RESOURCES CENTRE ERI, University College Cork, Naval Base, Haulbowline, Cobh, Co. Cork. IRELAND 2. SEA MAMMAL RESEARCH UNIT Gatty Marine Laboratory, University of St. Andrews, St. Andrews, Fife KY16 8LB. SCOTLAND 3. NATURA ENVIRONMENTAL CONSULTANTS LTD. Enterprise Centre, Wicklow Co. Wicklow. IRELAND 4. NATIONAL PARKS & WILDLIFE SERVICE Lagduff More, Ballycroy, Co. Mayo. IRELAND 5. NATIONAL PARKS & WILDLIFE SERVICE 7 Ely Place, Dublin 2. IRELAND Citation: Cronin, M., Duck, C., Ó Cadhla, O., Nairn, R., Strong, D. & O’ Keeffe, C. (2004). Harbour seal population assessment in the Republic of Ireland: August 2003. Irish Wildlife Manuals, No. 11. National Parks & Wildlife Service, Department of Environment, Heritage and Local Governement, Dublin, Ireland. Cover photo: Harbour seals and grey seals in Ballysadare Bay, Co. Sligo © Michelle Cronin Irish Wildlife Manuals Series Editor: F. Marnell © National Parks & Wildlife Service 2004 ISSN 1393 - 6670 1 CONTENTS Page Summary 3 1 - Introduction 4 1.1 Background to the study 4 1.2 Rationale 5 1.3 Research objectives 5 1.4 Partnership & Responsibilities 6 2 - Methods 7 2.1 Introduction 7 2.2 Aerial survey method 8 2.2.1 Thermal imaging equipment 8 2.2.2 Flight operations 9 2.2.3 Aerial-counts of haul-out
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