(a) Distances from the ship to sightings of Kogia, the three groups of Gervais’ beaked whales, and to the RHIB and (b) time interval between visual sightings of beaked whales.
Histogram of ICIs .
(a) Waveform, (b) normalized power spectrum, and (c) time-frequency (Wigner) distribution for a typical detected click from a Gervais’ beaked whale.
Averaged power spectra for three beaked whale species ( ‘s beaked whale, ‘s beaked whale, and ‘ beaked whale).
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