Response of one Ziphius to ship noise (136 dB maximum received level) included cessation of echolocation, as in our MFA sonar CEEs, but in contrast, dive duration and inter-deep-dive interval were short (see the electronic supplementary material; [ 9]).
It initiated an avoidance response that included energetic fluking, swimming away from the source at 2.6 m s−1, extended dive duration with an unusually slow ascent and a long (6.6 h) post-exposure inter-deep-dive interval (figure 1).
In the 2011 CEE, when RL reached 127 dB, the whale initiated a similar avoidance response, including energetic fluking, swimming away from the source at 3.1 m s−1 and a long (7.6 h) post-exposure inter-deep-dive interval (figure 2; electronic supplementary material).
Erosion of the surface signal with increasing window width is exacerbated in sections of frequent deep diving with relatively brief inter-dive intervals.
Therefore, the assumption that the dive table surface interval occurs at normal atmospheric pressure is invalidated by flying during that surface interval, and an otherwise-safe dive may then exceed the dive table limits.
The interval between dives within a dive bout was defined as time spent on the sea surface.
Try number three materialised for the hosts four minutes after the interval, Murray diving over after Dave Kilcoyne had been tackled just short of the line following flanker Tommy O'Donnell's initial burst.
Species-specific differences in track quality are predominantly due to variation in surfacing intervals and dive durations shifting the frequency of LCs.
Depth, diving time, bottom time, and surface interval were recorded for each dive, using a free-diving computer (UP-X1 Omersub, Spa, Monza Brianza, Italy).
After a one hour surface interval a second dive is conducted at the same site at 16 m.
The descent portion of each dive was defined as the interval between the fluke out immediately following the span of time spent at the surface and the first period when the animal was pitched level or at a positive deflection from the horizontal for at least 5 s.
