Temporal separation of two fin whale call types across the eastern North Pacific
Williams, Lauren N.
Kerosky, Sara M.
Wiggins, Sean M.
Hildebrand, John A.
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Fin whales (Balaenoptera physalus) produce a variety of low-frequency, short-duration, frequencymodulated calls. The differences in temporal patterns between two fin whale call types are described from long-term passive acoustic data collected intermittently between 2005 and 2011 at three locations across the eastern North Pacific: the Bering Sea, off Southern California, and in Canal de Ballenas in the northern Gulf of California. Fin whale calls were detected at all sites year-round, during all periods with recordings. At all three locations, 40-Hz calls peaked in June, preceding a peak in 20-Hz calls by 3–5 months. Monitoring both call types may provide a more accurate insight into the seasonal presence of fin whales across the eastern North Pacific than can be obtained from a single call type. The 40-Hz call may be associated with a foraging function, and temporal separation between 40- and 20-Hz calls may indicate the separation between predominately feeding behavior and other social interactions
The article of record as published may be found at http://dx.doi.org/10.1007/s00227-012-2061-z
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