Numbers of calling whales in the North Pacific
By: by William A. Watkins, Mary Ann Daher, Joseph E. George.
Contributors: Daher, Mary Ann.; George, Joseph E.; Woods Hole Oceanographic Institution.
Series: WHOI -- 2001-16.; Technical report; WHOI (Series) -- 2001-16.; Technical report (Woods Hole Oceanographic Institution)
Publisher: Woods Hole Oceanographic Institution
Published: 2001
Place of publication: Woods Hole, Mass
Language: eng
Number of pages: 37
Subjects: Whales -- Vocalization.; Whale sounds.
Description: 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.
Notes: "Funding was provided by CNO N45 Environmental Program and US Army Corps of Engineers (DCA87-00-H-0026) with funding from the Dept. of Defense Legacy Resource Management Program."

Includes bibliographical references.

Also issued online.