Table 2 Summary of species recorded during surveys conducted off the HCE. Common dolphins and pilot whales were identified to the genus level; hence sighting could represent either of the two species described for each genus. The truncations distance used for fitting the detection function is provided for each species with at least 30 sightings. The number of available sightings after truncation and removing data from the first five cruises is specified as used sightings.

Fin whale

Balaenoptera physalus

371

2.5

321

Blue whale

Balaenoptera musculus

70

2.5

58

Sperm whale

Physeter macrocephalus

127

2.5

112

Dusky dolphin

Lagenorhynchus obscurus

166

1.5

145

Common dolphins

Delphinus spp.

77

2

65

Sei whale

Balaenoptera borealis

11

–

–

Humpback whale

Megaptera novaeangliae

9

–

–

Unidentified large whale

167

–

–

Orca

Orcinus orca

10

–

–

Bottlenose dolphin

Tursiops truncatus

25

–

–

Risso's dolphin

Grampus griseus

10

–

–

Pilot whales

Globicephala spp.

27

–

–

Pigmy killer whale

Feresa attenuata

2

–

–

Unidentified delphiniid

22

–

–

Total

1094