In case you missed it buried in the details of my rebuttal two weeks ago about Facebook labelling a short PragerU polar bear video as “false information”, in his review of the video (18 May 2020) Canadian polar bear biologist Ian Stirling revealed that a recent survey of M’Clintock Channel polar bears documented a population increase. The problem is we have no scientific details about the survey – apparently completed four years ago, in 2016 – because the final report has not been made public (COSEWIC 2018, pp. 42-43; Crockford 2020).
Posted in Conservation Status, Population, Sea ice habitat
Tagged Climate Feedback, Facebook, fact check, good news, M'Clintock Channel, numbers, polar bear, PragerU, science, sea ice, video
Facebook has labelled a recent short PragerU polar bear video as “false information” based on a ClimateFeedback review featuring statements by Andrew Derocher and Ian Stirling published 18 May 2020.
The video, posted on Facebook 5 May 2020, is also available here and here. Also here on the PragerU website.
I was approached yesterday by Nick Coltrain, a reporter for the Des Moines Register and USA Today, asking for a statement about the accuracy of the PragerU video, which cites me as a source for two of their three ‘inconvenient facts.’
My comments are below but I reminded Nick that what is going on is a classic conflict that happens all the time in science: it presents no proof that I’m wrong or that the PragerU video is ‘false information’. Climate Feedback is not ‘factchecking’: it is presenting its preferred side of a disputed science issue.
Posted in Advocacy, Conservation Status, Population, Sea ice habitat, Summary
Tagged censor, Climate Feedback, disputed science, Facebook, fact check, false information, good news, polar bear, PragerU, sea ice, video
The report on the latest population estimate for harp seals off the east coast of North America was released in late March without fanfare and therefore no media attention. This was one of the missing scientific reports mentioned in my State of the Polar Bear Report 2019 released in February (Crockford 2020): results of surveys promised for months or years by early 2020 but not delivered.
Not surprisingly then, we find the report has good news: the population estimate of harp seals in the NW Atlantic has risen to about 7.6 million (range 6.55-8.82) animals (DFO 2020), up from 7.4 million in 2014 (DFO 2014).
Note that the survey was done in March 2017, a low ice year for the Gulf of St. Lawrence (see discussion below) and while this may have resulted in some increased mortality for pups born there, it is also known that many ‘Gulf’ pregnant females will instead have given birth off Newfoundland and Labrador in a whelping region called ‘The Front’. Apparently, these factors were accounted for in the population model.
Harp seal pups born at the Front are an important food for Davis Strait polar bears. This increase in the prey base for Davis Strait polar bears suggests the bear population may have grown substantially since the last survey in 2007 (Peacock et al. 2013; Rode et al. 2012). Davis Strai is the only subpopulation of polar bears officially considered to have ‘likely increased’ at 2018 by Environment Canada. A new Davis Strait population size survey was apparently completed in 2018 but the results are not yet available (Crockford 2020).
Highlights, quotes, and figures from the harp seal report below. Continue reading
The chart below shows what sea ice thickness over Hudson Bay was like at the first week of May in a so-called a ‘good year’ (2019) – when polar bears came off the ice in excellent condition late in the summer and left early in the fall (‘thick first year ice’ is dark green and indicates ice greater than 1.2m thick):
Hudson Bay ice conditions this year appear to be shaping up to be as good or better than last year for polar bears yet specialist researchers and their cheerleaders have still been claiming that bears in this region – Western and Southern Hudson Bay – are doomed because of poor ice conditions. It’s no wonder they still haven’t published the data they’ve been collecting on polar bear body condition and cub survival over the last 15 years or so (Crockford 2020). With most field work cancelled for this year, what’s their excuse for not getting that done?
A recent paper that attempted to correlate pollution levels and body condition in Barents Sea polar bears reports it found body condition of female bears had increased between 2004 and 2017 despite a pronounced decline in summer and winter sea ice extent.
“Unexpectedly, body condition of female polar bears from the Barents Sea has increased after 2005, although sea ice has retreated by ∼50% since the late 1990s in the area, and the length of the ice-free season has increased by over 20 weeks between 1979 and 2013. These changes are also accompanied by winter sea ice retreat that is especially pronounced in the Barents Sea compared to other Arctic areas” [Lippold et al. 2019:988]
Posted in academic freedom, Conservation Status, Life History, Population, Sea ice habitat
Tagged Barents Sea, body condition, denier, deplatformed, ice-free season, polar bear, sea ice, summer, Svalbard, threatened, vulnerable
For the second time this month, sea ice around Svalbard Norway was the 6th or 7th highest since records began in the late 1960s. Pack ice at the end of April still surrounds Bear Island (Bjørnøya) at the southern end of the archipelago, which is a rare occurrence at this date. These conditions document a recurrent pattern of high ice extent and especially extreme ice thickness in the Barents Sea since last summer.
Posted in Conservation Status, Population, Sea ice habitat
Tagged Barents Sea, Bear Island, icebergs, icebreaker, Novaya Zemlya, polar bear, Polarstern, sea ice, Svalbard, thick ice
A review of a newly-released (22 April 2020, on Earth Day) report commissioned by Canada’s Department of Fisheries and Oceans on the state of the Arctic seas published today in the National Post is a must read. It highlights the report’s emphasis that while the changes going on in our northern seas are indeed marked, they do not necessarily spell doom.
Oddly, polar bears are primarily represented in the report by an overview account of the special case of Western Hudson Bay – an outlier among Canadian subpopulations – that puts special emphasis on the claimed decline in body condition blamed on recent sea ice changes that is not supported by any recent data (Crockford 2020).
Posted in Advocacy, Conservation Status, science, Sea ice habitat, Summary
Tagged Arctic, climate change, Corcoran, COSEWIC, DFO, ecosystem, PGSG, polar bear, sea ice, status, western hudson bay