The acoustic calls of blue whales off California with gender data
Published Web Locationhttp://dx.doi.org/10.1121/1.1353593
The acoustic calls of blue whales off California are described with visual observations of behavior and with acoustic tracking. Acoustic call data with corresponding position tracks are analyzed for ﬁve calling blue whales during one 100-min time period. Three of the ﬁve animals produced type A-B calls while two produced another call type which we refer to as type D. One of the animals producing the A-B call type was identiﬁed as male. Pauses in call production corresponded to visually observed breathing intervals. There was no apparent coordination between the calling whales. The average call source level was calculated to be 186 dB re: 1 Pa at 1 m over the 10 – 110-Hz band for the type B calls. On two separate days, female blue whales were observed to be silent during respective monitoring periods of 20 min and 1 h.