Tag Archives: risk

Bear on shore in January that threatened residents of Foxe Basin community was shot

According to a report by CBC News earlier this week (18 February 2019), there was a defence kill of a potentially dangerous polar bear and her cub in Foxe Basin, Nunavut on January 4th that we are just hearing about now. Yet another bear on shore in winter, when there is plenty of sea ice, looking for food in an Arctic community and threatening the lives of its residents while a polar bear specialist blames such incidents on lack of ice.

Black Tickle bears again 15 March 2017 headline VOCM

Polar bear on shore in Labrador, early March 2017, VOCM report

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Narwhal and beluga ice entrapment is natural – not caused by global warming

A part-time Arctic researcher eager for media attention suggested earlier today that the ice entrapment of narwhals in 2008 and again in 2015 at Pond Inlet (that made headlines around the world) was the result of “sudden changes in temperature” caused by climate change. This grossly misleading claim ignores the facts: ice entrapment of narwhals is an entirely natural feature of the Arctic that has been known about for hundreds of years.

Narwhals_at risk from climate change_CBC 13 Aug 2016 headline

Narwhals: the ‘giant unicorn of the sea’ at risk from climate change” (CBC, 13 August 2016), a print version of a CBC Radio interview with Clint Wright that aired 8 August 2016. Wright is the general manager at the Vancouver Aquarium and apparently has “joined a team of researchers to tag and study” narwhals for several years – but does not seem to know much about the history or circumstances of natural ice entrapment.

Ice entrapment of small whales is nothing new. The first formally documented incident – in English – occurred in 1915 (Porsild 1918) and the phenomenon has probably occurred as long as there has been ice in the Arctic (millions of years).

Animals routinely become trapped in a few specific areas due to local geography: when ice that forms in the north moves south quickly, it blocks the entrances to inlets or coastal bays that still have open water. The presence of the pack ice causes nearby  temperatures to drop quickly. Rapid development of ice on the bay proceeds from the mouth toward the head of the bay. Any whales present cannot escape to open water and will eventually die or be eaten.

Pond Inlet at the north end of Baffin Island is one such place but Disko Bay in western Greenland is another. In fact, Pond Inlet and Disko Bay are almost identical in geographic layout even though they lie on opposite sides of Baffin Bay, so it’s not surprising that both are locations of repeated entrapment events.

Three highly informative journal articles on the phenomenon of ice entrapment of narwhals and beluga are open access documents that reveal some fascinating details of such incidents, including polar bear predation on trapped whales. h/t T. Nelson Continue reading

Polar bear habitat at 26 January 2016

There is still below average ice extent in the Barents Sea but there is no data whatsoever to indicate that this situation poses a problem for polar bears, given that as far as researchers know, polar bears eat little or nothing during the winter. That’s why the bears are at their leanest at the end of winter and why seal pups born in early spring are such a critical food source.

Note on map below (from WUWT Sea Ice Page, marked; original here) that polar bears are not found in three areas that are included in the total Arctic ice extent figures: below-average or above-average ice in the Sea of Okhotsk, Baltic Sea, and Gulf of St. Lawrence have no impact on polar bear health and survival.

 

Polar bear habitat at 26 Jan 2016_no bears marked_PolarBearScience_sm

Additional ice maps below. Continue reading