Video S1 from High rates of vessel noise disrupt foraging in wild harbour porpoises (Phocoena phocoena)
2018-01-31T10:02:07Z (GMT) by
Behavior of porpoise hp12_293a around the time of passage of a presumed fast ferry. UPPER PANEL: Spectrogram composed of power spectral densities (PSDs) in 1-Hz bands. The broadband vertical bands indicate noise when the porpoise surfaces. The narrow vertical lines at above 120 kHz are clicks produced by the tagged animal and its calf. LOWER PANEL: Approximate three-dimensional path of a harbour porpoise (individual hp12_293a, see figure 3) estimated by dead reckoning using pressure, accelerometer and magnetometer data recorded by the DTAG-3 tag. The track is colour-coded by root-mean-squared (RMS) minimum specific acceleration (MSA), a proxy for activity, in 0.5-s windows. The track has been displaced by 5 m relative to the water surface, to better show the movements of the porpoise during the vessel noise exposure.