While year-long recordings were not available from 2000 to 2008, the time periods analyzed fell within the periods of seasonal presence of Bryde's whales in the SCB. Peaks in calling in 2003, 2007, and 2008 occurred in late August. In 2006 and 2010, peaks occurred in October. There was no clear peak in 2005, and there was also considerably less calling presence that year than in other analyzed years between 2003 and 2010. Despite variability in calling presence, there was a significant overall increase in Bryde's whale call-hour rate during the peak calling period between 2000 and 2010 (t(7)=2.74, P=0.029; Fig. 4), with a rate of increase of 0.014 call-hours/year. Although Bryde's whale calls were generally more prevalent during the warmer summer months, there was no significant relationship between call-hour rates and sea surface temperature (