Andrew Derocher

@AEDerocher

Professor of Biological Sciences . I've studied polar bears for 36 years. Author of Polar Bears: A Complete Guide to Their Biology and Behavior.

Edmonton, Alberta, Canada
Vrijeme pridruživanja: listopad 2014.

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  1. 3. velj

    Hudson Bay are still widespread but the grouping east of Churchill is a recurrent pattern & many bears are hanging out there. Little is know about seal distribution here but the bears are there for a reason & it's likely food.

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  2. proslijedio/la je Tweet
    31. sij

    In case anyone missed my last article, PBS News Hour has posted it. "How thawing permafrost is transforming the Arctic

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  3. 31. sij

    Interesting cougar project & Delaney Frame is a new grad student just starting with in my research group.

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  4. 30. sij

    For context, here's a caribou cached by a grizzly bear in the Mackenzie Delta, NWT. Grizzlies often cache but , rarely. The black spruce nearby was limbed by the bear to put on the carcass. Past PhD Mark Edwards (now with ) in photo.

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  5. 30. sij

    I've not seen a spike in followers (yet). For context, I also suggest students use Twitter for science (I urge them to follow active PhD students, post-docs & others taking new directions in ecology). Twitter is also good for finding grad positions & jobs.

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  6. 27. sij

    Great natural history study that compiles a range of observations. It's pretty cool - grizzly bears cache prey all the time but rarely do so. A polar bear is not a white grizzly but their ancestral roots show at times.

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  7. 27. sij

    Total rubbish on threat of hunting to . Climate change is by far the biggest threat to the species. Hunting is a management issue. I get that some people are anti-hunting but making stuff up doesn't help conservation.

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  8. 27. sij

    Western Hudson Bay are spread far & wide. Huge variation in 2020 so far. We'll know about how the bears are doing in the spring when we're out on the sea ice. Last year they were closer to the west side & fat. We suspect they move more when they aren't finding prey.

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  9. 23. sij

    Interesting read by Ed Struzik on permafrost melting. Climate change is reshaping the Arctic: it's always been about more that "just ". It's about ecosystems & the people living in them.

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  10. 22. sij

    Fantastic MSc defence yesterday by grad Alyssa Bohart. Her thesis "Migration dynamics of polar bears (Ursus maritimus) in western Hudson Bay" was very well received by the examining committee! Publication to follow soon.

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  11. 20. sij

    New Baffin Bay paper. Key findings: 1) bears spend 30 days more on land in 2000s compared to 1990s: correlated with changes in sea ice, 2) body condition declined for all sex, age, & reproductive classes & was correlated with sea‐ice, 3) twin litters could disappear.

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  12. 20. sij

    New paper estimates that 16% of S. Beaufort Sea population use subsistence killed bowhead whale carcasses. Carcasses are close to human settlements & create potential for human-bear conflicts. If for any reason whales weren't harvested, conflicts could spike.

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  13. 20. sij

    Anyone wondering why became the icon of climate change should explore the temperatures in the 2000s. Almost everywhere the bears live have shown the largest temperature increases in the world.

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  14. 14. sij

    I guest lectured in Biol. 468 today (Problems in Conservation Biology). Lots of great questions. It's not an uplifting lecture as it's hard to put a positive spin on conserving in a warming Arctic. Only solution: reducing greenhouse gases.

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  15. 13. sij

    Tracks of 2 that got into "trouble" in Churchill last autumn. One went far north then onto the ice & the other took off much farther south. The "north" bear is a wanderer! Ear tag radios giving polar bear research great new insights.

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  16. 9. sij

    Canada assessment 2018 "... may become Threatened in the future because the effects of sea ice loss on this species will be extensive..." 2008 "... there is uncertainty over the overall impact of climate change..." Many think COSEWIC underestimated climate change risk.

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  17. 8. sij

    Loss of sea ice is habitat loss for & many other Arctic species. Without sea ice, a very different ecosystem will emerge. Killer whales will assume the top predator position & N Atlantic / Pacific species will take over.

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  18. 6. sij

    W. Hudson Bay are farther east & more to the north this year compared to 2019. It will be interesting to see how the difference affects the bears. In 2019, conditions were good for the bears. Staying close to home uses less energy & that helps accumulate fat stores.

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  19. 2. sij

    Rather telling graphs of sea ice from A good illustration of habitat loss. We think there are thresholds for polar bear populations below which populations will disappear but the level likely varies for each of the 19 populations across the Arctic.

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  20. 2. sij

    Killing a in a town with 24 h of darkness is far from a "panic". Not a great outcome but human safety has to be the priority. Bears are unpredictable & dangerous. Such events are increasing so meaningful solutions are critical.

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