We were heading east to the Silfra fissure in the Thingvellir national park, where we were going to go diving (temperature -2C), though first we had to stuff our chilly limbs into blubber suits, and then into dry suits.
We can tolerate overcooling, routinely recovering from long periods of hypothermia with body temperatures diving 20 or more degrees below normal.
Depth and temperature records (Figure 9a; 10a, section 3) indicate that bluefin in the NWC display a unique foraging behavior in relation to the North Wall of the North Atlantic current that can be identified by diving behaviors, ambient temperature and thermoregulatory biology observed through the archival tag records.
We therefore analyze water temperatures and diving behavior within the high-use areas as well as outside as measured through electronic tags.
The diving behaviors and water temperatures encountered by the archival tagged bluefin tuna were site specific and differed between the four overall high-use areas (Figs. 7 9a; Table 3).
The pressure data were used to infer diving activity, and the temperature data to refine position estimates by matching against sea surface temperature data [13], [26].
In water temperatures around zero, diving bells have been taking divers 100 metres below the surface since Monday evening to attach the cables to holes cut in the hull.
Differences in temperatures experienced and diving behavior displayed were then analyzed between day and night.
Moreover, we examine whether bluefin tuna in high-use areas exhibit site-specific diving behaviors and experience site-specific internal/ambient temperatures, and whether their presence coincides with unique biophysical settings that would indicate their importance as foraging habitats.
The shrew, which is the world's smallest diving mammal, is able to increase its body temperature just before it dives, according to a recent study.
