There is a new polar bear genetics paper out in the Journal of Heredity, by University of Alaska Fairbanks genetics professor Matt Cronin and colleagues. Matt Cronin, in case you didn’t know, was the first to pick up the close genetic relationship between polar bears and grizzlies, as a result of research he and colleagues did back in the early 1990s (Cronin et al. 1991).
Figure 1 from Cronin et al. 2014 (in press) showing the locations of bear samples used in their genetic study. MT, Montana; AK, Alaska; Polar bear samples were taken from the Chukchi, Beaufort and Barents Sea populations.
While no earth-shattering new information was revealed in this new study, reported over the weekend by the Alaska paper SitNews (March 15), it used a more detailed method to confirm the results of previous work – that polar bears have been around long enough to have survived several past Interglacial periods that were warmer than today (with less ice in the Arctic) and are genetically distinct from grizzlies.
A feature that really set this work apart was how it was promoted.
Posted in Evolution, Hybridization, Sea ice habitat
Tagged Beth Shapiro, Cahill, Ed Green, genetics, geological time, global warming, Matthew Cronin, polar bear, polar bear evolution, survival, University of Alaska Fairbanks, warm interglacials
It’s here – as promised and right on schedule — the sea ice atlas put together by University of Alaska Fairbanks (UAF) now has ice concentration maps for Alaska going back to 1850 — and for every year up to 2013.
Several examples are included below: August 1850 vs August 1870, and April 1850 vs. April 1920 and April 2012.
For background, see my post announcing the site preview, which was then limited to 1953-2012 data, when it became available in late January.
Posted in Conservation Status, Sea ice habitat
Tagged Alaska, Beaufort, Bering, Chukchi, historical sea ice, past polar bear habitat, polar bear, polar bear habitat, sea ice atlas, sea ice concentration, sea ice maps, UAF, University of Alaska Fairbanks
University of Alaska Fairbanks (UAF) is offering a new interactive sea ice map (which they call an atlas), that looks interesting and potentially useful, announced at Alaska Dispatch over the weekend (January 25, 2014: “New sea ice map offers a long-term look at climate change”).
At the moment, the years and months available include January 1953 to December 2012. Oddly, 2013 data is not included. The sea ice atlas charts polar bear habitat for the Southern Beaufort and Chukchi Sea subpopulations (including the Bering Sea), as well as the western portion of the Northern Beaufort Sea subpopulation region.
Posted in Sea ice habitat
Tagged Alaska, atlas, Beaufort Sea, Chukchi Sea, John Walsh, polar bear, sea ice, sea ice atlas, sea ice concentration, sea ice extent, September ice minimum, University of Alaska Fairbanks, Walsh