Tag Archives: females

Tracking west Alaskan polar bears in the Beaufort in October – all at Banks Is., CAN

polar-bear-habitat_usgs-from-cbc-story-sept-19-2015

Two out of three polar bear females that were collared by USGS researchers near Barrow, Alaska last spring are hanging out on the northwest coast of Banks Island, Canada. The other bear (bright green icon) appears to have been collared on the ice off Prudoe Bay in April. And as I discussed last month, it’s unusual for bears from the western end of the Southern Beaufort subpopulation (or even the central region) to end up in the Northern Beaufort subpopulation territory.

beaufort-tracking-usgs-bear-movements-october-2016-sm

Original caption: “Movements of 3 satellite-tagged polar bears for the month of October, 2016. Polar bears were tagged in 2016 on the spring-time sea ice of the southern Beaufort Sea. All 3 of these bears have satellite collar transmitters. Polar bear satellite telemetry data are shown with AMSR2 remotely-sensed ice coverage from 29 October, 2016.” See full resolution image here and close-up below.

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Tracking polar bears in the Beaufort Sea during August 2016

Only three females with collars are still being tracked by USGS researchers in the Beaufort Sea and all of them spent August 2016 on the sea ice in the eastern portion, off the coast of Banks Island.

tranquilized_pb570_s-beaufort-march-2014_usgs

Meanwhile, as Arctic sea ice nears the annual low, NSIDC predicts that 2016 will likely not set a new record but may bottom-out below 2007 (the second-lowest since 1979). The impact of low September sea ice on polar bear health and survival, based on recent research reports, will be the topic of an upcoming post.
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Tracking polar bears in the Beaufort Sea – one tagged bear left at year end 2015

I’ve combined the months of November and December for this post on USGS polar bear tracking in the Beaufort Sea because there’s not much to tell: there’s one tagged bear left and she’s going almost nowhere. Where’s the news in that?

Beaufort tracking USGS bear-movements-November 2015 sm

Movements of 1 satellite-tagged polar bear female for the month of November, 2015; shown with sea ice coverage at 30 November 2015. This bear was tagged in the spring of 2015 in the Southern Beaufort Sea. See original image here and December movements below.

Actually, it does tell us something: this female is probably in a sea ice den, a relative common phenomenon in the Beaufort Sea. And she’s on ice that’s out over very deep water. Continue reading

Sea ice breakup update: high ice coverage just about everywhere, even Hudson Bay

There is still a lot of sea ice in Hudson Bay, Foxe Basin, Davis Strait and Baffin Bay this week – more than average for this date – with slightly less than average in the Beaufort Sea. Past behaviour of Western and Southern Hudson Bay polar bears suggests the mean date that bears come ashore for the summer this year will be later than average due to the plentiful ice available, regardless of when polar bear biologists decide that “breakup” has occurred.

Hudson Bay breakup July 8 2015_CIS

Hudson Bay, with almost 50% of the bay still covered in ice, has the third highest coverage this week since 1992 (after 2009 and 2004); Davis Strait has the highest coverage since 1992; and Foxe Basin and Baffin Bay have the highest coverage since 1998. For this week, the Beaufort Sea has the second highest coverage since 2006 (after 2013), and more ice than was present in 1971, 1982, 1987, 1988 and 1998 – among others.

Published data shows that most polar bears of Western Hudson Bay traditionally come ashore in July, but this year it might be late July or even August. Have a look at the charts below.
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Tracking polar bears in the Southern Beaufort June 2015 – all 17 bears out on the sea ice

Sixteen females with satellite collars plus one with a glue-on transmitter – down from 17 with collars and 6 with tags last month – all out on the ice during the month of June 2015.

Tranquilized_pb570_S Beaufort March 2014_USGS

Polar bears were captured by USGS biologists in 2014 and 2015 on the spring-time sea ice of the southern Beaufort Sea. The glue-on tags don’t seem to be holding up very well, with only one remaining out of the original eight deployed this spring.
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