Sea ice breakup is always a little bit different year to year but since I have the maps archived, take a look at the differences and similarities at this date for this year compared to 2014…
Is there evidence that any polar bears – say Western Hudson Bay bears, for example – were negatively affected by sea ice levels in 2014? Not that I’ve heard. In fact, quite the opposite.
Polar bear guide and blogger Kelsey Eliasson, writing from Churchill, Manitoba, had this to say about the condition of bears and freeze-up that year (16 Nov. 2014):
“With these families appearing [heading out to the ice], it really sums up at just what a productive season this has been for the western Hudson Bay population. Any guide who knows their stuff will tell you this was a banner year for cubs, one we haven’t seen in a long time.”
Meanwhile, bears are starting to come ashore and cause a bit of grief:
Southern Hudson Bay (two days ago): “Polar bear shot after wandering through Kashechewan” [see map below for location: the bear shot was a cub that appears to have been separated from its mother and sibling, who were spotted several km away not causing any trouble]
Iqaliut, Baffin Island (this morning): “Polar bear rips 6 tents pitched in Iqaluit park”
Posted in Conservation Status, Polar bear attacks, Sea ice habitat
Tagged attacks, breakup, Churchill, encounters, polar bear, problem bears, sea ice, summer, threatened, western hudson bay
Walt Meier, sea ice scientist at NASA Goddard, made a statement yesterday about this year’s ice conditions [2016 Climate Trends Continue to Break Records: July 19, 2016]:
“It has been a record year so far for global temperatures, but the record high temperatures in the Arctic over the past six months have been even more extreme,” Meier said. “This warmth as well as unusual weather patterns have led to the record low sea ice extents so far this year.“ [my bold]
Well, except for Davis Strait/Labrador Sea this spring. And Western Hudson Bay/Foxe Basin this month – plus the fact that late July sea ice in the Laptev Sea is higher than it’s been for more than a decade (more on that below).
I guess totals matter for some things – just not for polar bears. However, it’s nice to see the issue of melt ponds get some attention, since they are such a prominent feature of polar bear habitat during the summer melt season.
Posted in Life History, Sea ice habitat
Tagged accuracy, Beaufort, Chukchi, extent, ICEBRIDGE, Laptev Sea, melt ponds, NASA, Northeast Passage, satellite radio collars, sea ice, summer
There is slightly less ice this year in Hudson Bay than last year but it is hugging tight against the western shore, which means polar bears in Western and Southern Hudson Bay will be able to stay out on the ice (if they want to) until August.
The latest weekly ice graph from the Canadian Ice Service (for 9 July) below shows average ice coverage this year (and more than there was in 1976 and 1977):
[By the way, the IUCN Polar Bear Specialist Group website is still “under construction” allowing them to avoid mentioning the less-than-dire conclusions contained in the 2015 IUCN Red List assessment]
More ice maps below, comparing previous years.
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.
Money quote from a just-accepted paper by Master’s student Jody Pongracz and supervisor Derocher (“Summer refugia of polar bears (Ursus maritimus) in the southern Beaufort Sea” Polar Biology, in press 2016):
“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 in Life History, Sea ice habitat, Uncategorized
Tagged Andy, Derocher, failures, problems with collars, satellite collars, sea ice, Southern Beaufort, subadult males, thick spring ice, tight collar, University of Alberta
The recent open water in the Southern Beaufort didn’t seem to change what polar bears were doing – bears tracked by USGS show them on the ice, likely trying to hunt. More ice edge means more hunting habitat at this time of year.
However, few hunts are likely successful at this time of year – because only older seals are on the ice and the broken ice makes escape so much easier for the seals (see previous post here). Fat bears on shore this summer (like the ones seen at Kaktovik in September) will tell us that they got enough to eat earlier in the season. Note that bears in good condition that appear at the whaling bone piles in September are there by choice (not stranding) and they got fat by feeding in the spring (March-May), not by picking at leftover whale scraps. Calories from terrestrial sources (for most bears) just reduce the amount of weight they lose over the summer.
More maps below. Continue reading
I watched an episode of Discovery Channel’s Shark Week last Friday and I have to admit, it gave me a terrifying déjà vu moment.
Specifically, it was the episode called “Shark Bait” (1 July 2016) – about the potentially explosive problem of booming populations of grey seals around Cape Cod (NE US, Massachusetts), the increasing numbers of great white sharks that are moving in to hunt them (see trailers here and here), and the thousands of relatively blasé humans that play and surf in the shallows nearby. UPDATE: video now available on Youtube, see below:
What could possibly go wrong?
I’ve already imagined what could go wrong – in my polar bear attack thriller, EATEN.
The parallels of EATEN with this developing shark situation are more than a little unnerving and makes it clear that my piece of speculative fiction may apply to more than polar bears. [ebooks still on sale for 99 cents – see direct links at bottom of this post]
See the details on the great white shark/seal conundrum below and decide for yourself.
Posted in Polar bear attacks, Uncategorized
Tagged Cape Cod, Eaten, epidemic, great white, grey seals, JAWS, population explosion, shark, Shark Bait, shark problems, shark week, speculative fiction, thriller
Polar bears in virtually all regions will now have finished their intensive spring feeding, which means sea ice levels are no longer an issue. A few additional seals won’t make much difference to a bear’s condition at this point.
The only seals available on the ice for polar bears to hunt in early July are predator-savvy adults and subadults but since the condition of the sea ice makes escape so much easier for the seals, most bears that continue to hunt are unsuccessful – and that’s been true since the 1970s. So much for the public hand-wringing over the loss of summer sea ice on behalf of polar bear survival! Continue reading
Posted in Advocacy, Life History, Sea ice habitat
Tagged adaptation, bearded seals, extirpated, harp seals, hunting, hype, PBI, polar bears, prey, ringed seals, save our sea ice, sea ice, spring feeding, stalking, summer, threatened