Here’s an excerpt of my article “Polar bears miss the message on global warming,” just out in the Fall 2014 issue of RANGE Magazine.
Posted in Advocacy, Conservation Status, Summary
Tagged activist organizations, activist scientists, Center for Biological Diversity, Ian Stirling, magazine article, Polar Bears International, population status, World Wildlife Fund, WWF
Here are two more priceless quotes from the minutes of the last meeting of the IUCN Polar Bear Specialist Group (PBSG) – on issues with sea ice percentages used to define “ice-free” and the problem of bears with collars showing up on sea ice that, according to ice data, does not exist. These quotes are in addition to the ones I posted earlier this week (here and here).
See the original document for the context here.
Posted in Conservation Status, Population, Sea ice habitat
Tagged Arctic, breakup, conservation status, freeze-up, ice-free, IUCN, PBSG, satellite radio collars, sea ice concentration, sea ice experts, Seth Cherry, threatened with extinction, tracking polar bears
IUCN Polar Bear Specialist Group conservation biologists are determined to have polar bears listed as ‘threatened with extinction’ by the International Union for Conservation of Nature (IUCN) in 2015 – even though the bears would not meet that classification if assessed today.
According to the minutes of their last meeting (in addition to the astonishing admissions from sea ice experts I reported yesterday), PBSG members are busy planning their strategy. They have thrown objectivity to the wind and are certain they can find a way to
mask overcome the inadequacies of their case and see polar bears remain listed as ‘vulnerable’ (IUCN-equivalent to ‘threatened’ in the US) on the 2015 IUCN Red List update.
Along with some other priceless quotes, the minutes reveal their plan. See the original document for the context of these quotes here and an excerpt of “the plan” (pgs. 12-17) here. Continue reading
Posted in Conservation Status, Population
Tagged Bayesian models, conservation biology, conservation status, IUCN, PBSG, polar bear, population estimates, predictions, Red list, threatened, vulnerable
Here’s a significant turn of events involving a story I reported on earlier: a US District Court judge ruled on Friday 25 July 2014 that the Bering/Chukchi Sea population of bearded seal (Erignatha barbatus) was improperly given ‘threatened’ species status in 2012. Judge Beistline ordered the National Marine Fisheries Service (NMFS) “to correct deficiencies in its study of the population.“
Bearded seals are important secondary prey species for polar bears in some regions of the Arctic (Thiemann et al. 2008), after ringed seals (which were also listed as ‘threatened’ in 2012).
Among other points made in his written decision, the judge is quoted as saying (reported here):
“A listing under the ESA based upon speculation, that provides no additional action intended to preserve the continued existence of the listed species, is inherently arbitrary and capricious.” [my emphasis]
“Arbitrary and capricious” — now that’s a slap-down. He also reportedly called the ESA listing “an abuse of discretion.”
The question is, how often have other ESA listings – not challenged in court – been based on similarly arbitrary and capricious decisions that also involved an abuse of discretion?
More quotes from Judge Beistline’s decision, and reaction to it, below.
Posted in Conservation Status, Life History, Sea ice habitat
Tagged Alaska District Court judge, arbitrary, bearded seal, conservation status, declining sea ice, ESA, Judge Beistline, National Marine Fisheries Service, NMFS, polar bear prey, predictions, threat to survival, threatened with extinction
You’ve probably heard the argument: animal populations that have been through a major decline in numbers often have such low genetic diversity that they are extremely vulnerable to subsequent extinction.
Photo credit USGS
In an interview in late March regarding a new genetic paper on polar bear evolution (by Matt Cronin and colleagues), polar bear biologist and Polar Bears International spokesperson Steve Amstrup made a ridiculous statement: that polar bears have never experienced a rate of warming like they’ve seen over the last 30 years. I countered that easily here.
In that same interview about the Cronin et al. paper, fellow geneticist Charlotte Lindqvist offered an outdated argument against future polar bear survival that is as easy to refute as Amstrup’s “unprecedented rate of warming” nonsense.
I didn’t have time to deal with it back in April [where has the time gone?] but want to get back to it now because it’s important: there is lots of evidence to support my contention that polar bears are not more vulnerable to extinction just because they have low genetic diversity.
Posted in Conservation Status, Evolution
Tagged Amstrup, extinction, extinction risk, genetic diversity, increasing genetic diversity, Lindqvist, low genetic diversity, polar bear, population bottleneck, population size, recovery, reduced population size, threat to survival, threatened species
“Our results suggest that mark–recapture estimates may have been negatively biased due to limited spatial sampling. We observed large numbers of bears summering in southeastern WH, an area not regularly sampled by mark–recapture.” Stapleton et al. 2014.
Polar bear at Wapusk National Park in August 2011. Courtesy Parks Canada.
We’ve seen the results of this 2011 study before, in government report format. But now it’s been revamped, peer-reviewed and published in a respected scientific journal – it actually came out in February, without fanfare, but I’ve only just come across it.
Some excerpts below, with conclusions that should raise some eyebrows.
Posted in Conservation Status, Population, Sea ice habitat
Tagged aerial survey, early breakup, endangered, invalid methods, later-than-average breakup, mark-recapture, polar bear, population estimate, Seth Stapleton, Southern Beaufort, Southern Hudson Bay, threatened, US Fish and Wildlife Service, Wapusk National Park, western hudson bay