Tag Archives: primary productivity

A ‘mass exodus’ of polar bears from Alaska to Russia has taken place, local residents claim

An article in a UK newspaper yesterday contains a claim made by local residents that polar bears which used to hang around Utqiagvik (formerly known as Barrow) in western Alaska, are ‘moving to Russia’ (i.e. the Chukchi Sea) in a ‘mass exodus’. It’s certainly possible but if so, it should come as a surprise to no one and is good news for polar bears.

If the allegation is upheld by scientific evidence, polar bears will not have been pushed out of Alaska by lack of summer sea ice (i.e. ‘forced to migrate’) but rather pulled into the Chukchi Sea by abundant food resources that did not exist when summer ice cover was more extensive. It’s a big difference and it speaks to the benefits of less summer sea ice that no one wants to discuss.

Moreover, moving temporarily to where conditions suit them best is what polar bears do all the time: it’s not a new phenomenon, it’s a prominent feature of their biology (Crockford 2019).

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Polar bears are an environmental success story: short video from ICSC Canada

From Tom Harris at ICSC Canada: In ‘State of the Polar Bear Report 2020’, zoologist Dr. Susan Crockford writes, “in 2020, even though summer sea ice declined to the second lowest levels since 1979, there were no reports of widespread starvation of bears, acts of cannibalism, or drowning deaths that might suggest bears were having trouble surviving the ice-free season.

22 March 2021 [1:34]

Arctic report card 2020 highlights the huge benefit of less summer sea ice: more food

As well as summarizing sea ice changes, NOAA’s 2020 Arctic Report Card features two reports that document the biggest advantage of much less summer sea ice than there was before 2003: increased primary productivity. Being at the top of the Arctic food chain, polar bears have been beneficiaries of this phenomenon because the Arctic marine mammals they depend on for food – seals, walrus and bowhead whales – have been thriving despite less ice in summer.

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