The results of three recently-released studies that were not included in the last IUCN Red List assessment add more than 2,050 bears (on average)1 to the official 2015 global polar bear estimate, a point you won’t likely hear next Monday (27 February) from most polar bear specialists, conservation organizations, their cheerleaders and corporate sponsors on International Polar Bear Day.
This means the adjusted 2015 global estimate for polar bears should be about 28,500 (average), a marked increase over the official estimate of 26,500 (average) for 2015 — and an even larger increase over the 2005 estimate of about 22,500 (average)2, despite the dramatic loss of summer sea ice since 2007 that we hear about endlessly.
It is increasingly obvious that polar bears are thriving despite having lived through summer sea ice levels not predicted to occur until 2050 – levels of sea ice that experts said would wipe out 2/3 of the world’s polar bears (Amstrup et al. 2007; Crockford 2017 v3).
Update 26 March 2019: see “Latest global polar bear abundance ‘best guess’ estimate is 39,000 (26,000-58,000)”
Updated 1 June 2017: see addition to Footnote 2.
Posted in Population, Sea ice habitat
Tagged captive breeding, captivity, estimate, increase, International Polar Bear Day, loss of summer ice, population size, predictions, sea ice, timeline, zoos
Ironically, just as I was about to remind readers that we are entering the peak period of polar bear births around the Arctic (see previous post, “December is polar bear nativity month”), I came across an article about breeding polar bears in captivity — getting the bears to give birth in zoos.
Hudson the polar bear cub is a zoo-born polar bear. He moved in January 2013 from the Toronto Zoo, where he was hand-raised after being rejected by his mother, to the Assiniboine Park Zoo, Winnipeg. The Assiniboine Park Zoo were also the recent recipients of a cub orphaned when its mother was shot after a polar bear attack in Churchill. Photo from Toronto Zoo.
The newspaper article I saw was all about how technically difficult the generation of polar bear cubs has been for the Toronto Zoo (Canada) but it was the premise for the breeding program itself that caught my attention: to save them from extinction.
The zoo is not waiting until the bears are down to the last few hundred (or even thousands) – no, the zoo is starting now, while polar bears are as plentiful as they have been in the last 40 years, to prepare for their demise.
Posted in Advocacy, Population
Tagged animal activists, Assiniboine Park Zoo, captive breeding, captivity, Hudson, polar bear, polar bear births, polar bear cubs, polar bears in winter, pregnancy, Stanley Park Zoo, Toronto Zoo