Table 2. Seasonal characteristics of fin whale song.

region	year	months with song	marked calls	October median IPI (s)	December median IPI (s)	February median IPI (s)	Monthly Change in IPI (s)
Southern CA	2000–01	October–February	1486/935	20.7 (0.6)/26.6 (0.8)	23.5 (0.6)/29.6 (0.8)	25.7 (1.0)/32.3 (1.1)	1.4/1.7
	2001–02	October–May	2255/740	18.0 (0.5)/24.3 (1.1)	23.5 (0.9)/30.0 (0.8)	27.9 (0.6)/33.2 (1.1)	1.6/1.5
	2002–03	September–May	2984/1676	20.5 (0.6)/26.3 (0.8)	23.8 (0.5)/30.1 (0.6)	27.9 (0.8)/32.6 (1.3)	1.8/1.5
Bering Sea	2000–01	October–April	2797/2605	21.3 (0.5)/—	26.4 (0.5)/31.7 (0.4)	29.2 (0.3)/34.3 (0.6)	2.2/2.1
	2001–02	November–April	2720/2368	—	22.9 (0.7)/28.5 (0.7)	28.7 (0.3)/33.5 (0.4)	2.1/2.0
	2005–06	August–January	1533/1478	23.5 (0.4)/28.4 (0.4)	25.1 (0.5)/30.1 (0.7)	—	1.7/1.6
Hawaii	2000–01	December–April	1450/1077	—	22.2 (0.9)/27.5 (1.1)	28.7 (0.5)/34.2 (0.8)	2.9/2.7
	2005–06	November–March*	162/152	—	26.6 (0.7)/31.5 (1.0)	—	2.0/1.6

The total number of marked calls, as well as the October, December, and February song IPIs and median absolute deviation (in parentheses) are presented, with short IPIs shown before the/and long IPIs after. IPIs from song segments consisting of only short IPIs or with an intermittent series of short IPIs (mixed IPI songs) are included in calculation of short IPI for each month. Monthly change in IPI was calculated from October, or the first month with song if later, to February, or the last month with song if earlier.

* Although fin whale song was recorded in March of 2006, no song was evident in February, 2006.