Take-home quote from a new polar bear paper by Todd Atwood and colleagues (2016):
“…there is no causal link between the patterns in polar bear vital rates and increased use of terrestrial habitat…”
In other words, there was no information to link the increased time polar bears spent onshore with either an increase or a decrease in body condition, survival or cub production. The authors did find that polar bears were strongly attracted to the bone piles that accumulated in the fall from 2010-2013 after Inuit bowhead whale (Balaena mysticetus) hunting at Barrow, Cross Island, and Kaktovik. Isn’t that a surprise?
The results also appear to confirm previous work that showed terrestrial (land-based) foods are not important to polar bears – a conclusion I totally agree with and which I discussed last year here. No wonder there was no press release issued by USGS about this study. It’s only “news” because someone the Anchorage Daily News interviewed lead-author Atwood yesterday as a way of promoting the International Bear Conference (see previous post here, now updated with a link to the Talk of Alaska radio podcast). Atwood implied there could be advantages to bears from feeding on the bone piles but admitted he had no data to support that assumption.
Posted in Advocacy, Life History, Population
Tagged Atwood, bone piles, Cross Island, decline, Kaktovik, polar bear, population size, sea ice, Southern Beaufort, terrestrial foods, whale carcasses
A Southern Beaufort female with cubs, from the fall of 2007.
Note the non-starving condition.
Twenty-one amazing photos of polar bears feasting on the remains of a bowhead whale carcass outside of Kaktovik, Alaska, taken by wildlife photographer Michal Tyl, have been posted by the UK Daily Mail (December 12, 2013): “Now that’s what you call a spare rib! Pack of bloody-faced polar bears spend day and night stripping a beached whale to its bones.” Have a look and see if you can spot any “starving” bears!
What you will see is the relative size of the bears: notice how much larger males are than females, how small cubs-of-the-year are relative to big males. Oh, and notice all the big fat polar bear butts. I can’t include any of the photos here because of copyright rules (the one above is from 2007) but I have included a map showing the location of Kaktovik, a quote from the article, and a link to my previous post on Kaktovik bears, which has a wealth of background information. Continue reading
Brief interlude from Western Hudson Bay. My fascination with Arctic dogs and polar bears collides in Alaska!
BILL HESS / logbookwasilla.com
A string of remarkable photos of polar bears at the Kaktovik whale carcass dump (leftovers from subsistence whaling) on Barter Island on the north slope of Alaska and a dog having some fun, by Wasilla photographer Bill Hess, posted at this blog here. Go have a look. Note the condition of the bears, nice and fat from the look of it. Maps below to get you oriented geographically.
I had a Malamute years ago who played like this with horses…whole different game when played with polar bears!
From Anchorage Daily News feature from a few days ago. continue reading
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