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  • Dr. Steve Amstrup with a tranqulized polar bear (Ursus maritimus) on the ice pack of the Beaufort Sea. Kaktovik, Alaska
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  • Dr. Steven Amstrup with a polar bear on the Beaufort Sea, Alaska.
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  • Dr. Steven Amstrup and assistant Karyn Rode prepare a large male polar bear for scientific data collection they perform out on the ice of the Bering Sea. This large specimen was captured after being immobilized with a dart from a helicopter. This adult male wasn't even over 1,000 pounds, unlike many Dr. Amstrup captured in the 1980s that would tip the scales considerably over that 1,000-pound mark. Alaska
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  • Dr. Steven C. Amstrup checks the paw of polar bear (Ursus maritimus) #20571, a large male that had been tagged years earlier. Kaktovik, Alaska
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  • Dr. Steven Amstrup collects data from a polar bear on the Beaufort Sea, Alaska.
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  • USGS biologist Dr. Steve Amstrup and assistant Karyn Rode attempt to lift a small 365-pound female polar bear on the Beaufort Sea ice pack.
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  • Dr. Steven Amstrup, lead scientist for the US Geological Survey, darts a female polar bear on the Beaufort Sea. Darting the bears from a helicopter can be extremely treacherous. The pilot has to hover over a running animal that is twisting and turning, dodging and ducking, an animal that feels it's running for its life. This bear is hit directly between the shoulders with an immobilizing dart. It takes anywhere from 4-15 minutes for the drug to take effect and immobilize the bear which will be out for 1-2 hours as the scientists process the data.
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  • Mette Kaufman, an ice core scientist from the University of Alaska Fairbanks, climbs the ladder to the icebreaker Polar Sea while working in the Arctic Ocean.
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  • Dr. Steven Amstrup, lead polar bear scientist for the USGS, checking polar bear tracks on the ice of the Beaufort Sea, Alaska.
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  • Dr. Steven Amstrup and Eric Regehr with a large male polar bear on the Beaufort Sea in Alaska.
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  • Karyn Rode prepares to take data from a large male polar bear on the ice pack of the Beaufort Sea, Alaska.
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  • Steve Amstrup and Geoff York, USGS biologists, taking blood from an immobilized large male polar bear.
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  • Dr Steven Amstrup on a Tundra Buggy.
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  • Dr. Steven Amstrup and Susie Miller collect the Bioelectric Impedance Analysis (BIA) that quantifies fat reserves of a recently immobilized polar bear on the Beaufort Sea, Alaska.
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  • Jeff Wenciker and Zachary Spence, US Coast Guard science technicians, lower a CTD in to the Arctic Ocean for water sampling.
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  • Katrin Iken, biologist from the University of Alaska, Fairbanks, collects an amphipod removed from under the ice of the Arctic Ocean.
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  • Steve Amstrup and Geoff York, USGS biologists, taking blood from an immobilized large male polar bear.
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  • Dr. Steve Amstrup, USGS biologist, and field assistant Karyn Rode taking field data from an immobilized large male polar bear.
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  • Dr. Steven Amstrup meets with Jane Goodall at the Association of Zoos and Aquariums conference in Portland, Oregon.
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  • Merav Ben David holds up two vials of blood, one taken from a mother polar bear and the other from her cub. Arrctic Ocean
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  • Dr. Steve Amstrup on a Tundra Buggy watching and photographing polar bears. Canada
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  • Dr. Steve Amstrup, USGS biologist, and chopper pilot Doc Gohmert hover over a polar bear (Ursus maritimus) recently darted with immobilizing drugs. Beaufort Sea ice pack, Kaktovik, Alaska
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  • Dr. Steve Amstrup, USGS biologist, takes steady aim from the helicopter as he prepares to dart a polar bear on the ice pack of the Beaufort Sea. Kaktovik, Alaska
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  • Merav Ben David puts a blood sample in a Blood Hematology Analyzer aboard the Polar Sea icebreaker.
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  • Dr. Steve Amstrup weighs a polar bear on the Beaufort Sea, Alaska.
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  • Merav Ben-David from the University of Wyoming  and project leader of the Polar Sea Icebreaker polar bear research cruise, passes by her two colleagues John Whiteman and Hank Harlow as they collect breath from a polar bear for a breath analysis experiment. Arctic Ocean
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  • Hank Harlow from the University of Wyoming demonstrates the process of how they collect and freeze the biceps femoris tissue sample  from a polar bear which will eventually be placed in liquid nitrogen for instant freezing.
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  • Daniel Whiting holds a glass fiber water filter used to collect samples of particulate organic matter such as chlorophyll A, fatty acids, staple isotopes and dissolved organic carbon from water collected with a CTD from the Arctic Ocean.
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  • Dr. Steve Amstrup working with a female polar bear that is coming out of an immobilizing drug on the Beaufort Sea ice pack.
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  • Geoff York a USGS biologist prepares a polar bear (Ursus maritimus) to start doing his research. Kaktovik, Alaska.
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  • Dr Amstrup prepares to attach a GPS satellite tracking collar to an immobilized polar bear on the Beaufort Sea. The collars are placed on females exclusively since the necks of males get too large for them to work properly. The collars are a high tech way to follow these animals far out onto the ice where humans can't go. The bears are tracked by satellites which helps the scientists determine the home range of individual animals and other details about a particular bear's life such as length of time spent resting or hunting in one area.
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  • A polar bear cub begins to wake from an immobilizing drug. Dr. Steve Amstrup and assistant work on its mother in the background. The cub's lip has green dye from a tattoo that was applied to the inside of his lips. Scientists will use the tatoo to identify him in the future.
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  • A scientist  in the wet lab of the Polar Sea Icebreaker pours water collected from a recent CTD cast into beakers for analysis.
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  • Tools of the trade of a polar beat scientist capturing bears.
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  • Dr. Megan Owen PBI scientist on the back of Buggy One.
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