Fig. 1: An example of a 0.25 kHz stimulus exposure trial. | Communications Biology

Fig. 1: An example of a 0.25 kHz stimulus exposure trial.

From: Humpback whale masked hearing thresholds in noise measured with modified behavioral observation audiometry

Fig. 1

As the whale group (illustrated by the whale icon) traveled southwards, the sound source vessel (vessel icon) moved into position and anchored 5.7 km south of the group’s trajectory (11:36). When the group was 4.5 km from the source vessel, transmission of the upsweeps started (11:59). The group immediately changed its dive behavior by decreasing time spent on the surface, then altered its course by turning southeast (at ~3.8 km from the source). The group continued to travel on a southeastern course, displaying short surface intervals, until it passed by the source vessel. The color bar inlay corresponds to the times that the locations of the whales were recorded.

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