Marine Mammal Sci (1999)
A line-transect survey specifically designed to estimate vaquita (Phocoena sinus) abundance over its entire range was carried out by three boats in the summer of 1997. There was a total…
A combined visual and acoustic estimate of 2008 abundance, and change in abundance since 1997, for the vaquita, Phocoena sinus
Gerrodette, Tim; Taylor, Barbara L.; Swift, René; Rankin, Shannon; Jaramillo-Legorreta, Armando M.; Rojas-Bracho, Lorenzo
Marine Mammal Science (2010)
A line-transect survey for the critically endangered vaquita, Phocoena sinus, was carried out in October–November 2008, in the northern Gulf of California, Mexico. Areas with deeper water were sampled visually…
Seasonal patterns in the abundance and distribution of California cetaceans, 1991-1992
Forney, Karin A.; Barlow, Jay
Marine Mammal Sci (1998)
This study presents a detailed seasonal comparison of the abundance and distribution of cetaceans within 100-150 nmi (185-278 km) of the California coast during 1991 and 1992. The results of…
Trends of harbour porpoise (Phocoena phocoena) density in the southern North Sea
Peschko, Verena; Ronnenberg, Katrin; Siebert, Ursula; Gilles, Anita
Ecological Indicators (2016)
In the southern North Sea, harbour porpoise occurrence increased in recent years after a phase of low abundances during earlier decades. Only very few studies on porpoise presence in the…
From echolocation clicks to animal density—Acoustic sampling of harbor porpoises with static dataloggers
Kyhn, Line A.; Tougaard, Jakob; Thomas, Len; Duve, Linda Rosager; Stenback, Joanna; Amundin, Mats; Desportes, Geneviève; Teilmann, Jonas
The Journal of the Acoustical Society of America (2012)
Monitoring abundance and population trends of small odontocetes is notoriously difficult and labor intensive. There is a need to develop alternative methods to the traditional visual line transect surveys, especially…
Abundance of harbour porpoise and other cetaceans in the North Sea and adjacent waters
Hammond, P.S.; Berggren, P.; Benke, H.; Borchers, D.L.; Collet, A.; Heide-Jørgensen, M.P.; Heimlich, S.; Hiby, A.R.; Leopold, M.F.; Øien, N.
Journal of Applied Ecology (2002)
The status of small cetaceans in the North Sea and adjacent waters has been of concern for many years. Shipboard and aerial line transect surveys were conducted to provide accurate…
Abundance estimate of finless porpoises off the Pacific coast of eastern Japan based on aerial surveys.
Amano, Masao; Nakahara, Fumio; Hayano, Azusa; Shirakihara, Kunio
Mammal Study (2003)
We carried out an aerial survey to estimate the abundance of finless porpoises Neophocaena phocaenoides off the Pacific coast of eastern Japan between Sendai Bay (38°23’N) and the mouth of…
Temporal changes in abundance of harbor porpoise (Phocoena phocoena) inhabiting the inland waters of Southeast Alaska
Dahlheim, Marilyn E.; Zerbini, Alexandre N.; Waite, Janice M.; Kennedy, Amy S.
Fishery Bulletin (2015)
Abundance of harbor porpoise (Phocoena phocoena) was estimated from data collected during vessel surveys conducted throughout the inland waters of Southeast Alaska. Line-transect methods were used during 18 seasonal surveys…