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Fig. 2. Scatter plots of dive duration (A,C) and vertical speed (B,D) as functions
of dive depth for all dives deeper than 20 m recorded on Ziphius
cavirostris (A,B) and Mesoplodon densirostris (C,D). The plots
in A and C show the surface-to-surface dive duration (dots) and the interval
from the start to the end of regular clicking (unfilled triangles) in each
dive. The absence of dive depths between 450 and 700 m for both species and
the observation that only dives deeper than this range have consistent
vocalizations leads us to define these as deep foraging dives (DFD). The plots
in B and D show vertical speed (i.e. depth rate) as a function of dive depth
during descents (downwards pointing black triangle) and ascents (upwards
pointing unfilled triangle). The difference between descent and ascent rate
for DFDs is apparent.
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