Original provider: Sea Mammal Research Unit, University of St. Andrews Dataset credits: Sea Mammal Research Unit, University of St. Andrews 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 6Beaufort 4 in an area of 1,005,743 km2. Aerial transects covered 15,802 km in good/moderate conditions (6Beaufort 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. Supplemental information: [2020-09-30] The following invalid species names were corrected according to the Integrated Taxonomic Information System (ITIS). Turtles: Testudines (173749) => Testudines (948936) Data from three teams aboard different airplanes were merged. Teams are flagged 'A', 'B' and 'C' in 'computer' attribute.
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Researchers should cite this work as follows:
Lacey, C. 2014. SCANS II cetacean sightings from aerial surveys 2005. Data downloaded from OBIS-SEAMAP (http://seamap.env.duke.edu/dataset/1153) on yyyy-mm-dd.
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This resource has been registered with GBIF, and assigned the following GBIF UUID: b5f929d7-02d8-4de7-8a23-b9917c0e3e63. OBIS-SEAMAP publishes this resource, and is itself registered in GBIF as a data publisher endorsed by Ocean Biodiversity Information System.
Occurrence,Marine Animal Survey,Marine Biology,Marine mammals,Sea turtles,Visual Sighting,Aircraft; Observation; Occurrence
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North Atlantic Ocean,European Atlantic shelf waters
|Bounding Coordinates||South West [0, -10.754], North East [61.943, 9.899]|
Scientific names are based on the Integrated Taxonomic Information System (ITIS).
|Superclass||Osteichthyes (bony fishes)|
|Subclass||Elasmobranchii (cartilaginous fishes)|
|Order||Cetacea (cetaceans), Cetacea (cetaceans), Testudines (Turtles), Cetacea (cetaceans)|
|Family||Delphinidae (dolphins), Delphinidae (dolphins)|
|Genus||Lagenorhynchus (white-beaked dolphins)|
|Species||Balaenoptera acutorostrata (Minke Whale), Cetorhinus maximus (basking shark), Delphinus delphis (Short-beaked Common Dolphin), Grampus griseus (Risso's Dolphin), Halichoerus grypus (Atlantic gray seal), Lagenorhynchus albirostris (White-beaked Dolphin), Mola mola (ocean sunfish), Orcinus orca (Killer Whale), Phocoena phocoena (Harbor Porpoise), Phoca vitulina (Harbor Seal), Stenella coeruleoalba (Striped Dolphin), Tursiops truncatus (Common Bottlenose Dolphin)|
|Start Date / End Date||2005-06-27 / 2005-08-04|
No Description available
|Title||SCANS II cetacean sightings from aerial surveys 2005|
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|Parent Collection Identifier||OBIS-SEAMAP|
marine, harvested by iOBIS