Thick Sea Ice is Detrimental to Seals and Polar Bears

Interesting article on Polar Bears.

Arctic studies show less sea ice promotes more photosynthesis. After sea ice had recently decreased by 9%, Stanford scientists determined productivity increased by 30%. More photosynthesis provides more food for fish. More fish feed more seals and fatter seals feed more polar bears.

To remain in the Arctic all winter ringed seals must create several breathing holes. When new thin ice first forms, they bust out several breathing holes using their heads. As winter proceeds they gnaw and claw to keep their holes open. Wherever sea ice survives for several years it becomes too thick to create breathing holes. So, across the Arctic, regions of thick ice contain the fewest seals and fewest bears. In contrast, in the Hudson Bay where new ice must form each year seals and bears are abundant!

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Polar Bear Update Mar 12 2019

From Susan Crockfords site:

Abundant ice in Svalbard, East Greenland and the Labrador Sea is excellent news for the spring feeding season ahead because this is when bears truly need the presence of ice for hunting and mating. As far as I can tell, sea ice has not reached Bear Island, Norway at this time of year since 2010 but this year ice moved down to the island on 3 March and has been there ever since. This may mean we’ll be getting reports of polar bear sightings from the meteorological station there, so stay tuned.

Read it all here

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“But you can’t equate seeing more bears with there being more bears”

The Inuit say there are more Polar Bears.

Everyone says there are more polar bears, and they’re not scared of us. Ten years ago, they’d run when they saw a human. Now they’re no longer shy. They keep on coming.’

The climate scientists say: Don’t believe your lying eyes.

In places such as Arviat, adds Professor Andrew Derocher of the University of Alberta, there might appear to be more bears, ‘but you can’t equate seeing more bears with there being more bears’.

 

Around the Arctic, polar bears ¿ estimated by the International Union for Conservation of Nature to number in total about 26,000 ¿ are divided into 19 ¿sub-population¿ groups [File photo]

According to scientists, three of Canada¿s 13 bear sub-populations are in decline, including West Hudson Bay. However, a new Nunavut government bear management plan cites TEK from Inuit communities that contradict this: they say none of the bear populations are shrinking, while nine are increasing

So who is right – the scientists and campaigners or what the Nunavut government calls Inuit ‘TEK’ – traditional ecological knowledge? Despite the bears’ iconic status, it is impossible to give a definitive answer.

Scientists use two main methods to estimate the changing size of polar bear sub-populations: ‘mark and recapture’, which requires bears to be tranquillised and tagged, and aerial surveys. But both have huge margins of error.

According to scientists, three of Canada’s 13 bear sub-populations are in decline, including West Hudson Bay.

However, a new Nunavut government bear management plan cites TEK from Inuit communities that contradict this: they say none of the bear populations are shrinking, while nine are increasing.

Meanwhile, a study published in 2016 revealed past cases where TEK and scientists disagreed about bear sub-populations – and claimed the Inuit were eventually proven right.

Moreover, if the West Hudson bears have declined recently, this may have nothing to do with sea ice. Since 1979, the long-term trend in ice across the Arctic is down.

But in Hudson Bay, a paper by Prof Derocher and others suggests that although the sea is frozen for three weeks less than in the 1980s, this has not got worse since 2001.

Meanwhile, the latest survey of the Chukchi Sea, between Russia and Alaska, where there has been a marked decline in sea ice recently, says it has a stable and healthy sub-population of bears.

Alaska’s Polar Bear Population Is Booming

More Polar Bears

The Chukchi Sea finally has a polar bear population estimate! According to survey results from 2016 only recently made public, about 2937 bears (1522-5944) currently inhabit the region, making this the largest subpopulation in the Arctic. This is exciting news — and a huge accomplishment — but the US Fish and Wildlife Service responsible for the work has been oddly mum on the topic.

Not only that, but an extrapolation of that estimate calculated by USFWS researchers for Chukchi plus Alaska (the US portion of the Southern Beaufort Sea subpopulation) was estimated at 4437 (2283-9527), although with “significant uncertainty.” Nevertheless, it means the 2016 estimate for Alaska could be roughly three times what it was in 2010: a whopping 1500 or so, up from about 450 (or about 225-650) for the same area estimated during the last survey (Bromaghin et al. 2015: Fig. 5a).

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Too Many Polar Bears or … Can We Shoot More?

Too Many Polar Bears … or killing 600 a year isn’t keepin the numbers in check … or The Inuit want to sell  more hides.

There are too many polar bears in parts of Nunavut and climate change hasn’t yet affected any of them, says a draft management plan from the territorial government that contradicts much of conventional scientific thinking.

The proposed plan — which is to go to public hearings in Iqaluit on Tuesday — says that growing bear numbers are increasingly jeopardizing public safety and it’s time Inuit knowledge drove management policy.

“Inuit believe there are now so many bears that public safety has become a major concern,” says the document, the result of four years of study and public consultation.

“Public safety concerns, combined with the effects of polar bears on other species, suggest that in many Nunavut communities, the polar bear may have exceeded the co-existence threshold.”

Polar bears killed two Inuit last summer.

The plan leans heavily on Inuit knowledge, which yields population estimates higher than those suggested by western science for almost all of the 13 included bear populations.

Scientists say only one population of bears is growing; Inuit say there are nine. Environment Canada says four populations are shrinking; Inuit say none are.

 

Read the rest.

 

Polar Bears Are Doing Fine – Except For the Ones Who Are Shot

Polar Bears in northern Canada are doing fine.

Except for the ones shot and skinned and pelts shipped to Asia.

One of the people who oversees an Indigenous hunt of polar bears says the population is doing well, despite heart-wrenching photos online suggesting some bears are starving.

Every year, the Nunatsiavut government awards polar bear licences to Inuit hunters living in the northern Labrador settlement area.

The Inuit set a quota of 12 polar bears this winter. Nunatsiavut wildlife manager Jim Goudie said all 12 were taken within the first seven days of the season.

A 2007 study showed that there were roughly 2,150 bears in the Davis Strait region, which was nearly 1,300 more than previously thought. A new study is currently underway to determine if that trend has continued. (pbsg.npolar.no)

Goudie said it’s just the latest evidence that polar bears are on the rebound in northern Canada — a trend he said officials have been recording for years.

“There are lots of signs of bears,” he told CBC Radio’s Labrador Morning. “Lots of bears and a continuation of what we’ve seen over the last three or four years.”

Those who hunt bears are legally obligated to donate any meat they don’t use, but they are free to do what they want with the pelts.

Most opt to sell them to wealthy buyers from Canada to East Asia, and each pelt is embedded with a computer chip to prove it was acquired through a legal hunt.

http://www.cbc.ca/news/canada/newfoundland-labrador/polar-bear-population-hunt-nunatsiavut-1.4628156