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Developer Mark Johnson out in the field holding an original DTAG.

Developer Mark Johnson out in the field holding an original DTAG.
Developer Mark Johnson out in the field holding an original DTAG.
Developer Mark Johnson out in the field holding an original DTAG.
Developer Mark Johnson out in the field holding an original DTAG.
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Developer Mark Johnson out in the field holding an original DTAG.
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04/18/2006
johnson-whale_d-tag.jpg
Image of The Day caption:
Mark Johnson, an engineer at WHOI, holds the "DTAG" , a non-invasive temporary tag he designed that attaches to a whale and records ambient sounds and the whale's motions as it dives. The tag then later pops off the whale and floats to the surface. Using such tags to study pilot whales in the Canary Islands, a research group including Johnson recently discovered that the whales behave like deep-sea cheetahs when they feed, performing high-speed sprints to depths of 1000 meters (3,280 feet) to catch prey.
Annual Report caption:
Engineer Mark Johnson and colleagues are using non-invasive, temporary tags––known as DTAGs––to digitally record the movements of whales during their dives, as well as the sounds that they make and hear. In a recent study of pilot whales, they discovered that the creatures make high-speed, all-or-nothing dives to chase and catch large prey before surfacing to catch their breath. Their behavior stands in stark contrast to the longer, slower, and more conservative dives of other whale species.
Caption from Oceanus magazine, Vol. 50, No. 2, Pg. 62:
Former WHOI engineer Mark Johnson co-invented the revolutionary DTAG.
Caption from Oceanus magazine, Vol. 46, No. 3, Pg. 37:
Mark Johnson, (shown here) an engineer at Woods Hole Oceanographic Institution, designed the DTAG, a noninvasive, temporary tag that records whale movements and sounds in the deep. Below, he is poised to attach a DTAG to a pilot whale off the island of El Hierro in the Canary Islands.
Photo courtesy of Mark Johnson
© Woods Hole Oceanographic Institution
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