The administrative reports used in 2007 to support the decision to list polar bears as ‘threatened’ under the US Endangered Species Act (ESA) in 2008 disappeared from the US Geological Survey website several years ago. I have archived them here in pdf format to make them easy to find for anyone wishing to access the accuracy of the models, data, and assumptions made in 2007.
Steven Amstrup in 2005, then lead USGS polar bear biologist, with triplet cubs, Prudhoe Bay, AK.
This is a housekeeping post meant for future reference. I’ve included citations for the relevant sea ice projection papers used in the models presented in the 2007 documents and a few other related reports from the same time period. Continue reading
Posted in Conservation Status, Sea ice habitat
Tagged ACIA, Administrative report, Amstrup, Beaufort Sea, Bergen, DeWeaver, Durner, ESA, Executive Summary, Hassol, Holland, Hunter, listing decision, Obbard, polar bear, projections, Regher, Rode, Schliebe, Science Strategy to Support, sea ice, Solomon, Stirling, US Fish and Wildlife Service, us geological survey, USGS, Zhang
Demographic and traditional knowledge perspectives on the current status of Canadian polar bear subpopulations. 2016 (in press). Jordan York, Martha Dowsley, Adam Cornwell, Miroslaw Kuc and Mitchell Taylor. Ecology and Evolution 6(9):2897-2924. DOI: 10.1002/ece3.2030
Take home quote:
“We see reason for concern, but find no reliable evidence to support the contention that polar bears are currently experiencing a climate crisis. We suggest that the qualitative projections for dramatic reductions in population numbers and range are overly pessimistic given the response of polar bears, climate, and sea ice to the present.”
Posted in Conservation Status, Population, Sea ice habitat
Tagged Canada, climate change, facts, Mitch Taylor, polar bear, population status, predictions, projections, sea ice
The other day, I got a call from an international journalist who admitted he’d done no research into the polar bear issue but believed, based on media reports he’d heard, that there must only be about 100-200 bears remaining in the Arctic. I know he’s not alone.
This journalist was utterly astonished to learn that the IUCN Red List assessment in 2015 put the polar bear population total at 22,000-31,000 bears and demanded proof that this was true.
Here is a summary of the Red List report, with references and links to the report:
The 2015 IUCN Red List assessment update for polar bears (published 18 November 2015) states that the global polar bear population is 22,000 – 31,000 (26,000), that the current trend is ‘unknown’ and that there is only a 70% chance that polar bear numbers will decline by 30% in 35 years (with virtually zero chance that the numbers will decline by 80% or more by 2050) – in other words, zero chance of extinction. [Detailed in a document called 22823 Ursus maritimus]. It classifies the polar bear as ‘vulnerable’ to extinction based on predictions of future sea ice decline due to global warming [similar to ‘threatened’ by other organizations] Pdf here.
Below is a list of what truly worrying species declines look like: that is, animals whose numbers have actually declined, no prophesies involved (Adler 2008).
Posted in Advocacy, Conservation Status, Population, Sea ice habitat
Tagged Amur tiger, climate change, decline, elephant seal, endangered, extinction, facts, fur seal, global warming, gray whale, hooded seal, IUCN, polar bear, predictions, projections, prophesy, rare species, Red list, sea ice, sea otter, Siberian tiger, status, Steller sea lion, threatened, vulnerable