Numbers of Calling Whales in the North Pacific

Since November 1995, the U.S. Navy's Sound Surveillance System (SOSUS) and other hydrophone arrays were used to regularly sample the occurrence of whale sounds in four regions bordering the continental margins across the North Pacific. The numbers of whales heard calling varied with season and...

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Bibliographic Details
Main Authors: Watkins, William A., Daher, Mary Ann, George, Joseph E.
Other Authors: WOODS HOLE OCEANOGRAPHIC INSTITUTION MA
Format: Text
Language:English
Published: 2001
Subjects:
Biology
*ACOUSTIC ARRAYS
*NORTH PACIFIC OCEAN
*WHALES
SEASONAL VARIATIONS
HYDROPHONES
NORTH PACIFIC WHALES
SOSUS(SOUND SURVEILLANCE SYSTEM)
Pacific
Balaenoptera musculus
Balaenoptera physalus
Megaptera novaeangliae
Online Access:http://www.dtic.mil/docs/citations/ADA397763
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA397763
Description
Summary:Since November 1995, the U.S. Navy's Sound Surveillance System (SOSUS) and other hydrophone arrays were used to regularly sample the occurrence of whale sounds in four regions bordering the continental margins across the North Pacific. The numbers of whales heard calling varied with season and location for each species, blue whales (Balaenoptera musculus), 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 numbers 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 number demonstrated seasonal variations in calling whales for each region.

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