[OANNES Foro] Integrating multiple data sources to assess the distribution and abundance of bottlenose dolphins

Mar Feb 7 18:27:57 PST 2012

Mammal Review
Article first published online: 6 FEB 2012
DOI: 10.1111/j.1365-2907.2011.00208.x
Integrating multiple data sources to assess the distribution and abundance of bottlenose dolphins Tursiops truncatus in Scottish waters

Barbara CHENEY1, Paul M. THOMPSON2, Simon N. INGRAM3, Philip S. HAMMOND4, Peter T. STEVICK5, John W. DURBAN6, 
Ross M. CULLOCH7, Simon H. ELWEN8,?, Laura MANDLEBERG9, Vincent M. JANIK10, Nicola J. QUICK11, Valentina ISLAS-VILLANUEVA12, Kevin P. ROBINSON13, Marina COSTA14, Sonja M. EISFELD15, Alice WALTERS16, Charlie PHILLIPS17, Caroline R. WEIR18, Peter G.H. EVANS19, Pia ANDERWALD20, Robert J. REID21, James B. REID22, Ben WILSON23
1 University of Aberdeen, Institute of Biological and Environmental Science, Lighthouse Field Station, Cromarty IV11 8YJ, UK. E-mail: b.cheney en abdn.ac.uk 2 University of Aberdeen, Institute of Biological and Environmental Science, Lighthouse Field Station, Cromarty IV11 8YJ, UK. E-mail: lighthouse en abdn.ac.uk 3 University of Aberdeen, Institute of Biological and Environmental Science, Lighthouse Field Station, Cromarty IV11 8YJ, UK. E-mail: simon.ingram en plymouth.ac.uk 4 Sea Mammal Research Unit, Scottish Oceans Institute, University of St Andrews, Fife KY16 8LB, UK. E-mail: psh2 en st-andrews.ac.uk 5 Hebridean Whale and Dolphin Trust, 28 Main Street, Tobermory, Isle of Mull, Argyll PA75 6NU, UK. E-mail: ptstevick en gmail.com 6 Protected Resources Division, Southwest Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, 8604 La Jolla Shores Dr., La Jolla, CA 92037, USA. E-mail: john.durban en noaa.gov 7 Scottish Association for Marine Science, Dunstaffnage Marine Laboratory, Oban, Argyll PA37 1QA, UK. E-mail: ross.culloch en durham.ac.uk 8 University of Aberdeen, Institute of Biological and Environmental Science, Lighthouse Field Station, Cromarty IV11 8YJ, UK. E-mail:simon.elwen en gmail.com 9 Hebridean Whale and Dolphin Trust, 28 Main Street, Tobermory, Isle of Mull, Argyll PA75 6NU, UK. E-mail: sightings en hwdt.org 10 Sea Mammal Research Unit, Scottish Oceans Institute, University of St Andrews, Fife KY16 8LB, UK. E-mail: vj en st-andrews.ac.uk 11 Sea Mammal Research Unit, Scottish Oceans Institute, University of St Andrews, Fife KY16 8LB, UK. E-mail: njq en smru.co.uk 12 Sea Mammal Research Unit, Scottish Oceans Institute, University of St Andrews, Fife KY16 8LB, UK. E-mail: iv22 en st-andrews.ac.uk 13 Cetacean Research and Rescue Unit, PO Box 11307, Banff AB45 3WB, UK. E-mail: kev.robinson en crru.org.uk 14 Cetacean Research and Rescue Unit, PO Box 11307, Banff AB45 3WB, UK. E-mail: marina.costa en crru.org.uk 15 Cetacean Research and Rescue Unit, PO Box 11307, Banff AB45 3WB, UK. E-mail: sonja.eisfeld en crru.org.uk 16 Whale and Dolphin Conservation Society, WDCS Wildlife Centre, Spey Bay, Moray IV32 7PJ, UK. E-mail: alice.walters en wdcs.org 17 Whale and Dolphin Conservation Society, WDCS Wildlife Centre, Spey Bay, Moray IV32 7PJ, UK. E-mail: charlie.phillips en wdcs.org 18 Ketos Ecology, 44 Lord Hay's Grove, Aberdeen AB24 1WS, UK. E-mail: caroline.weir en ketosecology.co.uk 19 Sea Watch Foundation, Ewyn y Don, Bull Bay, Amlwch, Isle of Anglesey, Wales LL68 9SD, UK. E-mail: peter.evans en bangor.ac.uk 20 Sea Watch Foundation, Ewyn y Don, Bull Bay, Amlwch, Isle of Anglesey, Wales LL68 9SD, UK. E-mail: p.anderwald en ucc.ie 21 Wildlife Unit, SAC Veterinary Services, Drummondhill, Inverness IV2 4JZ, UK. E-mail: bob.reid en sac.co.uk 22 Joint Nature Conservation Committee, Inverdee House, Baxter Street, Aberdeen AB11 9QA, UK. E-mail: jim.reid en jncc.gov.uk 23 Scottish Association for Marine Science, Dunstaffnage Marine Laboratory, Oban, Argyll PA37 1QA, UK. E-mail: ben.wilson en sams.ac.uk ? Present address: Mammal Research Institute, University of Pretoria, c/o Iziko South African Museum, PO Box 61, Cape Town, 8000, South Africa.

ABSTRACT
  a.. The distribution, movements and abundance of highly mobile marine species such as bottlenose dolphins Tursiops truncatus are best studied at large spatial scales, but previous research effort has generally been focused on relatively small areas, occupied by populations with high site fidelity.
  b.. We aimed to characterize the distribution, movements and abundance of bottlenose dolphins around the coasts of Scotland, exploring how data from multiple sources could be integrated to build a broader-scale picture of their ecology.
  c.. We reviewed existing historical data, integrated data from ongoing studies and developed new collaborative studies to describe distribution patterns. We adopted a Bayesian multi-site mark-recapture model to estimate abundance of bottlenose dolphins throughout Scottish coastal waters and quantified movements of individuals between study areas.
  d.. The majority of sightings of bottlenose dolphins around the Scottish coastline are concentrated on the east and west coasts, but records are rare before the 1990s. Dedicated photo-identification studies in 2006 and 2007 were used to estimate the size of two resident populations: one on the east coast from the Moray Firth to Fife, population estimate 195 [95% highest posterior density intervals (HPDI): 162-253] and the second in the Hebrides, population estimate 45 (95% HPDI: 33-66). Interaction parameters demonstrated that the dolphins off the east coast of Scotland are highly mobile, whereas those off the west coast form two discrete communities.
  e.. We provide the first comprehensive assessment of the abundance of bottlenose dolphins in the inshore waters of Scotland. The combination of dedicated photo-identification studies and opportunistic sightings suggest that a relatively small number of bottlenose dolphins (200-300 individuals) occur regularly in Scottish coastal waters. On both east and west coasts, re-sightings of identifiable individuals indicate that the animals have been using these coastal areas since studies began.

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