Numbers of calling whales in the North Pacific

Thumbnail Image
Watkins, William A.
Daher, Mary Ann
George, Joseph E.
Linked Authors
Alternative Title
As Published
Date Created
North Pacific
Replaced By
Numbers of calling whales
North Pacific whales
SOSUS arrays monitor whales
Since November 1995, the U. S. Navy's Sound Surveillance System (SOSUS) and other hydrophone arrays were used to regularly sample the occurance of whale sounds in the four regions bordering the continental margins across the North Pacific. The numbers of whales heard calling varied with the season and location for each species, Blue whales (Balaenoptera musculas), fin whales (Balaenoptera physalus), and humpback whales (Megaptera novaeangliae). For blue whales, calling during the fall season averaged 5 whales per event, winter averaged 1.5 whales per event, spring averaged 1 whale, and summer averaged 1.5 whales. For fin whales the number of whales heard ("F" calls from individuals) during winter averaged 3 whales per event, spring and fall calling averaged 1.5 whales, and summer averaged 1 whale. The "J" calling events, regardless of season, were judged to be from at least 6 fin whales. Humpback singing typically was from 3 whales. These numbers demonstrated seasonal variations in calling whales for each region.
Embargo Date
Watkins, W. A., Daher, M. A., & George, J. E. (2001). Numbers of calling whales in the North Pacific. Woods Hole Oceanographic Institution.
Cruise ID
Cruise DOI
Vessel Name