March 27, 2014
Cuvier’s Beaked Whales Set New Breath-Hold Diving Records
Whales dive to nearly 2 miles depth, for over 2 hours
Scientists monitored Cuvier's beaked whales' record-breaking dives to depths of nearly two miles below the ocean surface and some dives lasted for over two hours, according to results published March 26, 2014, in the open access journal PLOS ONE by Gregory Schorr from Cascadia Research Collective and colleagues.
Researchers recorded 1100 deep-dives, averaging 0.87 miles deep, and 5600 shallow-dives, averaging about 0.17 miles deep. The deepest dives recorded was one that reached nearly two miles below the ocean surface, and the longest lasted 137 minutes. The dives captured by this study not only exceed the previous Cuvier's beaked whale diving records of ~1 mile deep and 95 minutes, but also the current mammalian dive record previously set by the southern elephant seal at ~1.5 miles deep and 120 minutes. One striking difference compared to other divers is that deep-diving elephant seals and sperm whales require an extended recovery period after long, deep dives, whereas Cuvier's beaked whales average less than two minutes at the surface between dives.
According to the authors, the results of this study provide a better understanding of the unique diving capabilities of this species, which accounts for 69% of recorded marine mammal strandings associated with military sonar operations. However, all eight whales were tagged on a Navy sonar training range off the west coast of California and spent significant portion of their time there, suggesting that these animals may have learned to cope with anthropogenic disturbances that cause stranding in Cuvier's beaked whales elsewhere. "It's remarkable to imagine these social, warm-blooded mammals actively pursuing prey in the darkness at such astounding depths, literally miles away from their most basic physiological need: air," added Greg Schorr.
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