In my last post, I went over some of the spin and misrepresentation of fact contained in the claim by leading polar bear biologists Steven Amstrup, Ian Stirling and Andrew Derocher (Amstrup et al. 2006; Stirling and Derocher 2012) that cannibalism is on the increase because of the effects of global warming on Arctic sea ice.
I’ve had an opportunity to follow up on three points that puzzled me. Three relate to the Amstrup et al. paper that described three cases of cannibalism in the southeastern Beaufort Sea in 2004 and one to the incidents in western Hudson Bay in 2009. In the process, I found at least three more misrepresentations of fact and gained some insight on why these incidents of cannibalism were hyped so enthusiastically when they were. Continue reading
Posted in Advocacy, Life History
Tagged advocacy, Amstrup, anecdotal evidence, arctic sea ice, body condition, cannibalism, CDC, CITES, Daniel J. Cox, Derocher, ESA, hype, IPCC, Kassie Siegal, media, misrepresentation, nunatsiaq news, PBI, rogue bear, spin, starvation, starving polar bears, Stirling, UN Climate Conference, western hudson bay
[Updated Jan. 27, 2013 at 7:55 am PST Footnote added]
I was inspired to write this post after perusing the Q & A portion of the “What scientists say” section at Polar Bears International. One of the questions is this one:
Are Canadian scientists opposed to listing the polar bear as threatened, as some news organizations have reported?
While I don’t know when it was posted, this question appeared quite timely when I came across it, given the recent news (Nov. 30 2012) that “Canada is being forced to explain its policies to an international environmental watchdog” (Maclean’s magazine; see also the Calgary Herald story) because of a petition filed by the ever-litigious Center for Biological Diversity.
This petition, presented to the Commission on Environmental Co-operation by the CBD, followed on the heels of the news that Canada’s “Species at Risk Act” (SARA) will continue to list the polar bear as a species of “special concern” but not threatened or endangered (CBC story here).
The original petition was filed in November 2011 and re-issued in October 2012. It seems Canada now has until January 23, 2013 to respond to the Commission, after which an investigation could be launched.
We should hear their answer any day now – but guess what? Outspoken PBSG polar bear biologist Andrew Derocher looks to have at least inspired this petition, if he was not party to it.
As I pointed out in Featured Quote #22 (posted on Dec. 23, 2012), bearded and ringed seals have recently joined the polar bear on the American ESA’s list of animals that are “threatened” by computer-modeled predictions of Arctic sea ice declines projected 50-100 years into the future.
NOAA photos of bearded seal (top) and ringed seal (bottom). The bearded seal is one of the largest Arctic ice seal while the ringed seal is the smallest. Both are eaten by polar bears, although ringed seals are consumed most often.
The decision by NOAA (National Oceanographic and Atmospheric Administration) affects the Arctic subspecies of ringed seal (Phoca hispida hispida) as well as the Okhotsk subspecies (Phoca hispida ochotensis) (in addition to several others) and thus includes all ringed seals off Alaska’s coast in the Beaufort, Chukchi and Bering Seas. The decision also affects two particular subpopulations of bearded seal (Erignatha barbatus): the “Beringia” [Bering Sea/Chukchi] subpopulation (about half of which reside in Alaskan waters), and the subpopulation that lives in the Sea of Okhotsk. (Alaska Fisheries (NOAA) Final Decision). Continue reading
Posted in Conservation Status, Sea ice habitat
Tagged advocacy, bearded seals, Bering Sea, Chukchi, Erignatha barbatus, ESA, IUCN, Phoca hispida, ringed seals, status, threatened
In 2008, polar bears in the United States were declared ‘threatened’ under the Endangered Species Act (USFWS 2008). The IUCN (to which the Polar Bear Specialist Group (PBSG) belongs) lists the polar bear as “vulnerable” (IUCN Red List 2012). In Canada (where 60% of the world’s polar bears reside), the polar bear is listed as a ‘species of special concern’ (COSEWIC 2008:iii).
As Jonathan Adler pointed out in an excellent article that appeared on the heels of the American ESA listing decision (Adler 2008:112), “Insofar as the listing is based upon climate models, ice-melt projections, and assumptions about the effects of habitat loss on the bear’s prospects for survival in the wild, its scientific basis is quite speculative.” These are also, as I understand it, unprecedented criteria for ESA listing – no other species has been listed as endangered or threatened based on such speculation of future conditions.
So what do actual polar bear population declines look like?
The Western Hudson Bay, Canada (WHB) subpopulation is the only one that has recently declined by a statistically-significant amount. [see previous post here on the status numbers] The WHB polar bear subpopulation makes up 3-5% of the global total for the species, currently estimated at 20,000-25,000 animals.
In this post, I’ll compare the documented WHB population decline to the declines seen in a few truly endangered animals, just to put the much-bandied about numbers into some perspective. Continue reading