Monitoring Cetaceans in the North Pacific
Technical rept. 1 Sep 2007-30 Aug 2008
WASHINGTON UNIV SEATTLE APPLIED PHYSICS LAB
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Two projects were undertaken to monitor cetaceans in the North Pacific. The first was designed to obtain passive acoustic data from the U.S. Navys Northern Edge Range. Three instruments were deployed in April 2008 to monitor both high up to 25 kHz and low up to 1 kHz frequencies for odontocetes and mysticetes, respectively. Unfortunately, these instruments did not record any data. The second project was to analyze retrospective data obtained by analysts at the Whidbey Island NAVFAC for broad regions of the North Pacific. Long-term 1996-2002 trends of blue and fin whale vocalizations were found to have strong seasonal and geographic differences. Furthermore, the number of fin whale call events detected increased significantly over time throughout the North Pacific. Onset and continuation of fin whale calling seemed to be primarily driven by day length, while blue whale calling behavior was influenced by combinations of sea surface temperature, surface chlorophyll a concentration, and day length. Two manuscripts for peer-reviewed publications have been prepared for these data.
- Physical and Dynamic Oceanography