Fig. 3: Acoustic detections. | Communications Biology

Fig. 3: Acoustic detections.

From: Ultrasonic antifouling devices negatively impact Cuvier’s beaked whales near Guadalupe Island, México

Fig. 3

Weekly (black bars) and daily (blue dots) acoustic presence of a motorized vessel noise, b shipboard echosounders, c ultrasonic antifouling (UA) systems, and d Cuvier’s beaked whale echolocation clicks at the recording site in Bahía Norte from November 19, 2018 to October 3, 2020. Weekly plots show the number of hours of acoustic presence each week. Daily plots show acoustic presence in 1-min bins and the gray hourglass shading denotes nighttime. Gray vertical shading at the start and end of all plots denotes absence of recording effort. Yellow shading across all weekly plots in November 2018 and from July to November 2019 indicates the weeks with UA signal occurrence. A brief ~27 h effort gap in October 2019 corresponds to the time period used to refurbish the seafloor-mounted acoustic recorder.

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