Blue Whale (Balaenoptera musculus) Diel Call Patterns Offshore of Southern California

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Temporal separation of blue whale call types on a southern California feeding ground (2007, background): “Conversely, monitoring D calls alone would indicate that blue whales leave the Southern California Bight in November, 2 months before the final detections of B calls in the region.”
Diel periodicity in both sei whale vocalization rates and the vertical migration of their copepod prey observed from ocean gliders (2008, background): “Recent long-term acoustic recordings of blue whales have revealed diel variability in vocalization behavior that may be related to diel feeding patterns established by the vertical migration of prey (Stafford et al. 2005; Wiggins et al. 2005).”
Behavioral context of call production by eastern North Pacific blue whales (2007, unknown): “Increased production of B calls at night (Stafford et al. 2005, Wiggins et al. 2005) also supports this conclusion.”