Cetacean abundance and distribution in European Atlantic shelf waters to inform conservation and management

Philip Steven Hammond, Kelly Macleod, Per Berggren, David Louis Borchers, M Louise Burt, Ana Cañadas, Genevieve Desportes, Greg P Donovan, Anita Gilles, Douglas Michael Gillespie, Jonathan Charles David Gordon, Lex Hiby, Iwona Kuklik, Russell Leaper, Kristina Lehnert, Mardik Leopold, Philip Lovell, Nils Øien, Charles G. M. Paxton, Vincent RidouxEmer Rogan, Filipa Isabel Pereira Samarra, Meike Scheidat, Marina Sequeira, Ursula Siebert, Henrik Skov, Rene James Swift, Mark Tasker, Jonas Teilmann, Olivier Van Canneyt, José Antonio Vázquez

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Abstract

The European Union (EU) Habitats Directive requires Member States to monitor and maintain at favourable conservation status those species identified to be in need of protection, including all cetaceans. In July 2005 we surveyed the entire EU Atlantic continental shelf to generate robust estimates of abundance for harbour porpoise and other cetacean species. The survey used line transect sampling methods and purpose built data collection equipment designed to minimise bias in estimates of abundance. Shipboard transects covered 19,725 km in sea conditions ⩽Beaufort 4 in an area of 1,005,743 km2. Aerial transects covered 15,802 km in good/moderate conditions (⩽Beaufort 3) in an area of 364,371 km2. Thirteen cetacean species were recorded; abundance was estimated for harbour porpoise (375,358; CV = 0.197), bottlenose dolphin (16,485; CV = 0.422), white-beaked dolphin (16,536; CV = 0.303), short-beaked common dolphin (56,221; CV = 0.234) and minke whale (18,958; CV = 0.347). Abundance in 2005 was similar to that estimated in July 1994 for harbour porpoise, white-beaked dolphin and minke whale in a comparable area. However, model-based density surfaces showed a marked difference in harbour porpoise distribution between 1994 and 2005. Our results allow EU Member States to discharge their responsibilities under the Habitats Directive and inform other international organisations concerning the assessment of conservation status of cetaceans and the impact of bycatch at a large spatial scale. The lack of evidence for a change in harbour porpoise abundance in EU waters as a whole does not exclude the possibility of an impact of bycatch in some areas. Monitoring bycatch and estimation of abundance continue to be essential.
Original languageEnglish
Pages (from-to)107-122
JournalBiological Conservation
Volume164
DOIs
Publication statusPublished - Aug 2013

Keywords

  • Conservation status
  • North Sea
  • Line transect sampling
  • SCANS
  • Harbour porpoise
  • Bottlenose dolphin
  • Common dolphin
  • White-beaked dolphin
  • Minke whale
  • Bycatch
  • Habitats Directive

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