Ophelia (1992)
Aerial surveys covering 5117 linear kilometers were conducted at 91 and 183 m altitude under optimal sighting conditions in an area north of Fyn, Denmark, and in the Bay of…
The elusive harbour porpoise exposed: Strip transect counts off southwestern Ireland
Leopold, M. F.; Wolf, P. A.; Van Der Meer, J.
Netherlands Journal of Sea Research (1992)
Harbour Porpoises Phocoena phocoena were counted along a 270-km-long transect around southwestern Ireland on 17 July 1989, a day with exceptionally favourable weather conditions. A total of 251 porpoises were…
Abundance estimates of Pacific white-sided dolphin, northern right whale dolphin, Dall’s porpoise and northern fur seal in the north Pacific, 1987-1990
Buckland, S.T.; Cattanach, K.L.; Hobbs, R.C.
Bulletin of the International North Pacific Fisheries Commission (1993)
Line transect analysis was applied to the 1987-1990 North Pacific marine mammal sightings survey data, with a regression adjustment for size-biased sampling of schools. Abundance of Pacific white-sided dolphins is…
An experimental aerial survey for vaquita (Phocoena sinus) in the northern Gulf of California, Mexico
Barlow, Jay; Fleischer, Luis; Forney, Karin A.; Maravilla-Chavez, Octavio
Marine Mammal Sci (1993)
(...) The vaquita (Phocoena sinus) is endemic to the Gulf of California and all recent sightings have been in the northern Gulf (Silber 1990a, b) where most survey efforts for…
Preliminary winter abundance estimates for cetaceans along the California coast based on a 1991 aerial survey
Forney, K. A.; Barlow, J.
Report of the International Whaling Commission (1993)
We present the results of an aerial line transect census of cetaceans along the California coast during March and April 1991. This survey was the first of two aerial surveys…
Cetaceans of the northern Gulf of California: Distribution, occurrence, and relative abundance
Silber, Gregory K.; Newcomer, Michael W.; Silber, Patricia C.; Perez-Cortes M., Hector; Ellis, Graeme M.
Marine Mammal Sci (1994)
A total of 1,715 km of boat-based surveys and 1,521 km of aircraft-based surveys was conducted from 1986–1989 to assess the distribution, relative abundance, and ecological relationships of cetaceans in…
A global review of porpoise (Cetacea: Phocoenidae) mortality in gillnets
Jefferson, Thomas A.; Curry, Barbara E.
Biological Conservation (1994)
A global review of mortality of porpoises in gillnet fisheries indicates that individuals of all six species become entangled and die in gillnets. Harbor porpoises Phocoena phocoena are taken throughout…
A note on odontocete mortality from fishing gear entanglements off southern California
Heyning, J. E.; Lewis, T. D.; Woodhouse, C. D.
Report of the International Whaling Commission (1994)
Strandings and sightings data of toothed whales entangled in fishing gear are documented for the Southern California Bight from 1975-90. Entanglements involve three fisheries: a nearshore set gillnet fishery; an…
Population abundance of Dall’s porpoise (Phocoenoides dalli) in the western north Pacific Ocean
Turnock, B.J.; Buckland, S.T.; Boucher, G.C.
Report of the International Whaling Commission (1995)
Dall's porpoise in the western North Pacific Ocean suffered incidental mortality from the gillnets of the Japanese high seas salmon fishery until 1987 and mortality from the high seas squid…
Trends in abundance of Dall’s porpoise in the western north Pacific, 1979 to 1989
Turnock, B.J.; Buckland, S.T.
Report of the International Whaling Commission (1995)
Two density indices of Dall's porpoise abundance were estimated for the western North Pacific from 1979 to 1989. One index is the density of animals (number of animals per square…