Mean dive duration is 50 seconds with a maximum of 6.2 minutes.
Within oceanic TRAs, mean dive depth and mean dive duration were typically between 50 80 m (except UR06-3, Table S1, Fig. 5) and >20 min (except PA05-2 and UR06-3, Table S1, Fig. 5), respectively, with a high percentage of time spent between 0 10 m deep (typically >50%, except PA05-4 and GA06-2, Table S1).
Data were corrected for surface drift and a number of parameters were automatically extracted for each dive: time of start and end of dives, maximum dive depth (m), total dive and post-dive duration (s), descent, bottom and ascent phases duration (s), and the number of undulations in the dive profiles (s).
The mean dive depth did not differ between age classes (Table 1).
Dive times are typically 10 minutes when feeding, though dives of up to 21 minutes are possible.
The distributions of dive times and maximum dive depths were compared between the two sets.
However, within the high-use areas the mean diving depth was significantly shallower and the dive frequency and the variance in internal temperature significantly higher than compared to times in transit outside the high-use areas (multi-comparison ANOVA, P<0.01; Table 3).
Data were collected in triplicate at pre-dive, 1- and 24-h post-dive time points.
In parallel with the changes in iV/ Q, there was a significant decrease in alveolar dead space 24-h following the SCUBA dive, but not at the 1-h post-dive time point (see Table 1).
* Significantly different from pre-dive time point p < 0.05 †Significantly different from 1-h post-dive time point p < 0.05 In the SCUBA group, the degree of VA/ Q mismatch (measured as the slope of phase III along the iV/ Q curve) decreased significantly the day following the dive (0.023 ± 0.008 baseline vs. 0.000 ± 0.005, p < 0.05), but not immediately after the dive (see Table 1; Fig. 1).
