Posted onJanuary 3, 2023|Comments Off on Where were the starving W. Hudson Bay polar bears in 2020 if the population had declined by 2021?
Polar bears are supposed to starve before they die, the experts said. They said only a few years ago that dead or emaciated individuals onshore were evidence that many polar bears would soon be dying of starvation out on the sea ice. So, if the Western Hudson Bay (WH) subpopulation had indeed dropped by 27% by late summer 2021 as researchers claimed, where are all the photos of starving bears in the fall of 2020, the year before the count? The photo below of a thin female and cub was taken in late fall of 2021 (the year of the count) by a stationary web cam. In other words, some bears came off the ice without an optimal amount of fat because of poor hunting conditions over the winter but they were still alive. We know that 2020 had the shortest ice-free season in at least 20 years (and no similar images were captured), so bears went into the winter of 2020/2021 in good condition. Ditto for 2017-2019. In contrast to 2021, in 2016 (the year of the previous survey that also indicated a declining population size), bears reportedly came off the ice in good condition.
All I’ve seen are photos of fat bears and fat cubs, even a triplet litter in fall 2020. The shore of WH near Churchill should have been abounding with starving bears in 2020 (and in 2015), if the experts were right about starving bears preceding a population decline. More importantly, where are the studies on food-deprived bears onshore, as were done in the 1980s when WH bears were emaciated and cub survival poor (e.g. Ramsay et al. 1988)? WH bears are being used exclusively to model an implausibly pessimistic future for polar bears across the entire Arctic (Molnar et al. 2010; 2020), which means lack of good science for WH polar bears has big consequences. Covid restrictions in two of those ten years don’t excuse lack of study on this phenomenon.
Posted onDecember 11, 2022|Comments Off on Polar bear habitat update: Winter conditions well on their way across the Arctic except in Svalbard
December is late fall in the Arctic: winter conditions are gearing up but are not in full swing everywhere. Sea ice is developing quickly over Hudson Bay and moving slowly towards the Bering Sea but the Svalbard archipelago is still devoid of pack ice.
Such conditions north of Norway have existed most years since 2005: it’s certainly not a new development for Svalbard to be free of surrounding pack ice in December (although there was lots of ice in 2019 and 2021 by late November). This means traditional denning areas on the eastern islands again cannot be used by pregnant polar bear females, because they must be ensconced in their dens by at least late November or so.
Some seem to think this is a calamity: that such ‘loss of habitat’ is a huge concern for the survival of the subpopulation, if not the entire species. However, the same conditions existed in 2011 and did not result in a dramatic decline in the population as measured in 2015 (Aars et al. 2017) because the bears knew how to respond. They have apparently moved north to make maternity dens on the sea ice or east to the Franz Josef Land archipelago in Russia (Aars 2015). These areas are still within the Barents Sea subpopulation boundaries and researchers have known for two decades that bears have moved around within it (Andersen et al. 2012; Derocher 2005; Maurizen et al. 2002).
Posted onJanuary 4, 2020|Comments Off on Polar bear sea ice habitat at the start of the Arctic winter is abundant except off Labrador
After a bit of ineffectual hand-wringing from polar bear specialists about low summer and fall sea ice conditions and unsubstantiated worries about impacts on bear survival – including Southern Beaufort Sea, Chukchi Sea and Hudson Bay – I’ve heard no concerns expressed so far about the unusually low extent of ice off the East Coast of North America at the start of this winter. The Labrador Coast is just about the only region bereft of ice this winter but could catch up quickly at any time: ice coverage in the Barents Sea, East Greenland, and Bering Sea is similar to or above recent levels (last five years) so far, as is the overall extent.
Posted onMarch 5, 2018|Comments Off on My Financial Post op-ed: Polar bears keep thriving even as global warming alarmists keep pretending they’re dying
One powerful polar bear fact is slowly rising above the message of looming catastrophe repeated endlessly by the media: More than 15,000 polar bears have not disappeared since 2005. Although the extent of the summer sea ice after 2006 dropped abruptly to levels not expected until 2050, the predicted 67-per-cent decline in polar bear numbers simply didn’t happen. Rather, global polar bear numbers have been stable or slightly improved.
The polar bear’s resilience should have meant the end of its use as a cherished icon of global warming doom, but it didn’t. The alarmism is not going away without a struggle. Continue reading
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Posted onJune 11, 2017|Comments Off on USGS ‘treadmill’ paper repeats bogus claim that ice loss harmed polar bears
The newest polar bear science paper making the rounds courtesy the US Geological Survey, is a perfect example of a statistically-significant result with no biological significance. While the results are rather lame, the paper is dangerous because it repeats the disingenuous claim (see Crockford 2017) that Southern Beaufort Sea polar bear numbers declined in recent years due to summer sea ice loss.
The USGS authors (Durner et al. 2017) know this harm-from-summer-ice-loss assertion is not true for the Southern Beaufort subpopulation but the more papers they can get into print that say so, the more likely it will be believed — and the less likely readers will check older literature that documents the recent decline in polar bear numbers was due to a three year period (2004-2006) when thick ice conditions in spring made seal hunting a challenge, a repeat of a well-known phenomenon (e.g. Stirling et al. 1980; Stirling 2002) unique to this region that has been documented since the 1960s.
The Durner paper (USGS press release “Increased Sea Ice Drift Puts Polar Bears on Faster Moving Treadmill” published online 6 June ahead of print) spins the research results as potentially significant bad news but in so doing reveals how desperate they have become to make the public and their biology colleagues believe that Southern Beaufort polar bears, among others,are being negatively affected by summer sea ice loss (as per Stirling and Derocher 2012).
Durner, G.M., Douglas, D.C., Albeke, S.E., Whiteman, J.P., Amstrup, S.C., Richardson, E., Wilson, R.R. and Ben-David, M. 2017. Increased Arctic sea ice drift alters adult female polar bear movements and energetics. Global Change Biology. DOI: 10.1111/gcb.13746 http://onlinelibrary.wiley.com/doi/10.1111/gcb.13746/abstract [paywalled]
In fact, the Durner et al. paper does not document any harm to polar bears from the proposed ‘treadmill’ effect of more rapidly moving ice for the period 1999-2013 compared to 1987-1998, but instead uses models to suggest bears might have to eat one to three more seals per year to compensate for the extra energy needed to walk against the moving ice. That’s right: perhaps only 1 more seal per year out of the 50 or so they would usually consume (see Stirling and Øritsland 1995). In my opinion, that’s a pretty lame result for what one of the co-authors described as an immense amount of work.
News outlets have essentially used the USGS press release as a click-bait lede for another round of Trump-bashing with respect to the Paris climate change agreement, see here andhere: the stories are hardly about polar bears at all. And predictably, polar bear activist and co-author Steven Amstrup (paid spokesperson for Polar Bears International, famous for their “Save Our Sea Ice” campaign) appears to be using the same approach: an up-coming call-in talk radio program at NPR’s Anchorage affiliate KSKA for Tuesday 13 June at 10:00 (Alaska time, see “Talk of Alaska”) is being billed as a discussion of “polar bears, climate change, and the Paris Accord” (h/t AK geologist). Continue reading
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Posted onMay 22, 2017|Comments Off on Southern Beaufort sea ice melt in May: good news for polar bears or catastrophe?
Last week biologist Andrew Derocher recently implied via twitter that less sea ice in the eastern portion of the Southern Beaufort (SB) this year at mid-May is harmful to polar bears (calling it “a hole in the ice where polar bears used to live“), but both long-term and short-term data don’t support such a glass-half-empty interpretation.
Not only does spring breakup of sea ice in the SB normally begin with such open patches of water (see the video above from last year) — driven by the powerful currents of the Beaufort Gyre, not ice melt (explained in detail here) — it may actually be necessary for the survival of local seals, polar bears and whales in spring and early summer (Citta et al. 2015; Crawford et al. 2015; Harwood et al. 2015; Stirling et al. 1981).
As I’ve pointed out before, the biggest threat to SB bears is thick sea ice in spring and its associated late breakup, a 2-3 year-long phenomenon unique to this region known to have occurred about every 10 years since the early 1960s (well documented in the scientific literature) but which has not (as far as I know) happened since 2004-2006.
In other words, a considerable patch of open water and less concentrated ice in the eastern SB around Cape Bathurst is almost certainly a good thing for this particular subpopulation (see previous post here for an in-depth discussion) because historically, when a polynya of some extent has not formed by April or May it has been devastating for local marine mammals.
The fact that an extensive patch of open water existed at mid-May in this region last year and the year before (2015 and 2016) — with no public hue-and-cry about a great dying of SB bears from Derocher or anyone else — suggests that open water in the eastern SB this year is likely to be beneficial for SB polar bears, or at least benign. Continue reading
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Posted onOctober 13, 2016|Comments Off on Arctic sea ice grows & Churchill polar bears into their 4th month of fasting
A quiet year for problems in the polar bear capital of the world (Churchill, Manitoba) so far – despite this year tying for the second-lowest minimum since 1979 – and the ice is growing fast. In fact, Arctic ice growth in the second half of September was rapid and there is now more ice than there was at this date in 2007 and 2012 (when polar bears in those regions considered most at risk did not die off in droves).
Posted onOctober 2, 2016|Comments Off on Polar bear onshore in Tuktoyaktuk got so close to kids they heard it breathing
A report from the CBC this morning (with video) of a large polar bear wandering about the village of Tuktoyaktuk on the (Canadian) shore of the Eastern Beaufort Sea on Thursday (29 September) that got very close to a group of children playing outside. Fortunately, no one was hurt.
That this was a rare event is evident in the awe and excitement in the voices of the residents as someone recorded the movements of the bear through town (picture quality is not the best, but clear enough).
As I’ve said before, with more bears we can expect more interactions with people and more sightings like this that haven’t happened in decades. Map and quotes below. Continue reading
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Posted onJuly 13, 2016|Comments Off on New paper: U of A put collars on subadult SB polar bear males since 2007
Even though it is well known that subadult male polar bears (≤ 4 years old) continue to grow in mass and bulk as they mature – so that their thick necks get even larger – in recent years Andrew Derocher and his students at the University of Alberta potentially endangered the lives of many subadult males in the Southern Beaufort in the process of learning relatively little they didn’t already know.
“The number of bears tracked varied over time due to collar design, deployment, and both planned and unplanned collar retention.”
So, how much “unplanned collar retention” issues [collars that did not fall off as expected] went on during this 2007-2010 study? They don’t say.
Is this paper saying U of A researchers knew they had ‘collar retention’ issues as far back as 2010 but continued to deploy them on subadult males after that study was over? It seems so, because they had an issue with just such a bear last year.
The bear with an apparently tight collar that was photographed last fall (see photo above) went out onto the ice and no one knows what happened – there has been no more information on him since, although researchers have apparently been watching for him, updated just yesterday). The University of Alberta statement says (under the June 2 update):
“Ongoing research at the University of Alberta is shifting to ear tag radios as required”
So now they realize that putting collars on subadult males is not such a good idea. Brilliant!
CBC News (28 October 2015): “Photo shows polar bear injured by tight radio collar“. See previous posts here and here. In a Global News interview (23 November 2015), Derocher admitted his team had “likely” put the collar on that bear, prompting the University of Alberta to issue a “Q & A”statement on the incident – which continues to insist that failure of collars to release is “rarely seen.”
Posted onApril 9, 2016|Comments Off on Tracking polar bears in the Beaufort Sea – new crop of tagged bears for 2016
Five more bears were tagged near the Southern Beaufort Sea coast last month, all in the western portion of the coast where Chukchi Sea bears are often encountered. They join the one female who seems to have made a den way out over the continental shelf, where she’s been all winter.
“In collaboration with the U.S. Fish and Wildlife Service we are also experimenting with glue-on and ear tag satellite transmitters, which can be deployed on adult male bears and younger, still-growing bears.”
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