Bryde's whale seasonal range expansion and increasing presence in the Southern California Bight from 2000 to 2010

► Passive acoustic monitoring of Bryde's whales at the boundary of distribution range. ► Bryde's whale calls present seasonally between summer and early winter. ► Significant increasing trend in Bryde's whale presence between 2000 and 2010. ► No correlation between whale presence and local sea surface temperature. ► Whales likely following prey, and may be affected by long-term climate variability.