Figure 3: Time series of the humpback whale's behavioral data and stills from the video footage. (IMAGE)
Caption
Time series of the swimming speed, dive depth, dynamic acceleration and pitching angles are shown. The orange dots on the dynamic acceleration graph indicate fluke movements. a. All of the data collected during the tagged period (11 hours). The black arrow indicates the change in the whale's behavior. The whale was inactive during the recording period up until the arrow, and demonstrated active behavior in the period after the arrow. The black rectangle indicates the period during which video footage was also captured. b. An enlargement of the behavioral data collected during the video recording (black rectangle in a), showing that overall activity levels were low during this period. c. An enlargement of the rectangular segment in (b) showing three dives. The capital letters on the time series correspond to the stills from the video. In A, the movement of the water at the beginning of the dive can be seen. In stills B to H, the whale is resting and other drifting whales above the tagged whale are observable. Even after each dive, the footage remained stable because the whale was resting.
Credit
Takashi Iwata
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