Polar bear habitat is close to average for this date all over the Arctic this week. Barents Sea pack ice has increased substantially since last week and the ice in Eastern Canada is still well above average (and higher than 1979-early 1980s). Arctic ice has grown since a preemptive call for “the lowest maximum extent on record” was made by NSIDC last week — there is now at least as much ice for this date as there was in 2011 and almost as much as there was last year (2014).
Southern Davis Strait polar bears are out feeding on the glut of harp seals in the pack ice off Labrador and Newfoundland (discussed in detail here). One or more bears strayed a bit from the pack and ended up swimming around near the Hibernia oil platform (not far from the ice edge, although the CBC reports didn’t mention that “minor” fact), discussed in this recently updated post (with maps).
Harp seal female with nursing pup, DFO Canada.
Ice maps and graphs below: it’s worth a look.
Posted in Life History, Sea ice habitat
Tagged Barents Sea, Canadian Ice Service, CBC, denning females, Derocher, harp seals, Hibernia, Hopen Island, Labrador, Newfoundland, Norwegian Ice Service, NSIDC, oil platform, polar bears, sea ice, sea ice maximum, Svalbard, swimming
I’ve not written much about this subpopulation before but with the flurry of interest over “weakened” penis bones and toxic chemicals, I thought it was time to remedy the situation.
Posted in Life History, Pollution, Population, Sea ice habitat
Tagged contaminants, Davis Strait, diet, East Greenland, harp seals, hooded seals, movements, PBSG, PCBs, persistent organic pollutants, Persistent organohalogen contaminants, POC, polar bears, pollutants, POP, population assessments, seal pups, threatened, toxins, West Ice
Pretty typical ice levels in both regions for this time of year – Davis Strait polar bears (especially those in Labrador) are still onshore while Hudson Bay bears (even those in the south) have their sea ice hunting platform back.
Funny thing is, the Davis Strait subpopulation may still be increasing despite a longer ice-free season than Western Hudson Bay. And bears in the south of that region – who spend the summer onshore in Labrador – have the longest ice-free season of all1 yet according to the latest survey they were even doing better than bears in northern Davis Strait.
That apparent paradox has an easy explanation – sea ice extent in late summer/early fall (length of the ice-free season) has much less of an impact on polar bear health and abundance than the state of the food supply in the spring. More seals in spring, polar bears do well; few seals in spring, polar bears starve.
Posted in Conservation Status, Life History, Sea ice habitat
Tagged Davis Strait, Eastern Canada, harp seals, ice-free season, Labrador, Peacock, polar bear, sea ice extent, seal pups, spring sea ice, starving polar bears, survival