Numbers of calling whales in the North Pacific
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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.
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Whale call data for the North Pacific : November 1995 through July 1999 occurrence of calling whales and source locations from SOSUS and other acoustic systems Watkins, William A.; George, Joseph E.; Daher, Mary Ann; Mullin, Kristina; Martin, Darel L.; Haga, Scott H.; DiMarzio, Nancy A. (Woods Hole Oceanographic Institution, 2000-02)Calls of blue whales (Balaenoptera musculus), fin whales (Balaenoptera physalus), and humpback whales (Megaptera novaeangliae) were identified in the data from U.S. Navy Sound Surveilance System (SOSUS) and other hydrophone ...
Watkins, William A.; Daher, Mary Ann; George, Joseph E.; Haga, Scott H. (Woods Hole Oceanographic Institution, 2000-12)The seasonal distribution of calling ble whales (Balaenoptera musculus), fin whales (B. physalus), and singing humpback whales (Megaptera novaeangliae) has been analyzed from acoustic data recorded by the U.S. Navy Sound ...
Killer whales and marine mammal trends in the North Pacific : a re-examination of evidence for sequential megafauna collapse and the prey-switching hypothesis Wade, Paul R.; Burkanov, Vladimir N.; Dahlheim, Marilyn E.; Friday, Nancy A.; Fritz, Lowell W.; Loughlin, Thomas R.; Mizroch, Sally A.; Muto, Marcia M.; Rice, Dale W.; Barrett-Lennard, Lance G.; Black, Nancy A.; Burdin, Alexander M.; Calambokidis, John; Cerchio, Sal; Ford, John K. B.; Jacobsen, Jeff K.; Matkin, Craig O.; Matkin, Dena R.; Mehta, Amee V.; Small, Robert J.; Straley, Janice M.; McCluskey, Shannon M.; VanBlaricom, Glenn R. (Blackwell, 2007-10-26)Springer et al. (2003) contend that sequential declines occurred in North Pacific populations of harbor and fur seals, Steller sea lions, and sea otters. They hypothesize that these were due to increased predation by killer ...