Stephen Petersen

biologist mammalogist zoologist ... you get the -gist. Also Director of Conservation and Research at APZ. My tweets are my own -my retweets are not

[Stephen Petersen @stephenresearch]

@AEDerocher We (Zoo, DFO, Oceans North) did some trawling and dna barcoding recently and caught 2 species - marine crab and Arctic crab (Hyas alutaceus) this looks like an Arctic.

[Kristin Westdal, PhD @KWestdal]

Research by @jeffwhigdon and I (and other colleagues) on killer whale ice entrapments is cited by @emmaluck22 here:

[Andrew Derocher @AEDerocher]

The new IUCN/SSC Polar Bear Specialist Group website is now active. This is the most reliable source for information on polar bear status, ecology, and research.
https://t.co/DOd1zUiJw9

[Stephen Petersen @stephenresearch]

@ColinGarroway and I are recruiting 2 students. Check out the posting if genomics and conservation motivates you!

[Evelien de Greef @evelien_degreef]

New preprint on the population genetics of Arctic killer whales led by @ColinGarroway & I with many great collaborations! https://t.co/9DW7Oreou5. Photo taken by Maha Ghazal. 1/3

[IUCN Red List @IUCNRedList]

BREAKING NEWS: From Atlantic salmon to green turtles, #ClimateChange threatens a growing number of species.

Learn more in the latest @IUCNRedList update launched at #COP28.

https://t.co/y1AEuAGSD4

[Andrew Derocher @AEDerocher]

Hudson Bay & Foxe Basin (top area) showing a large negative ice anomaly. For polar bears, the red area should be ice-covered now & providing hunting & migration habitat. It's a late freeze-up. How long the bears can wait is a matter of individual variation in body condition.

[Stephen Petersen @stephenresearch]

We're hiring
https://t.co/5VFxBFgYBj

[Andrew Derocher @AEDerocher]

Hudson Bay polar bears still doing what most bears do when there's no sea ice: waiting. Little movement & there won't be much until temperatures dip. It's slowly cooling of in Churchill but the Bay is warm so freeze-up will take some serious cold weather to move it along.

[Joe Stover 🇨🇦 @joechurchill]

It has been a wild summer re: polar bears in Churchill. It’s only going to get crazier.

https://t.co/ZNztO0ZFec

[Andrew Derocher @AEDerocher]

All the tracked polar bears are home. Temperature in Churchill today hit 26 C (80 F). Warm (average is 17 C / 63 F). Biting insects will be wicked given low wind. Bears will swim, sit by lakes to catch breeze, or dig to permafrost to avoid bugs. They're nasty on hot/calm days.

[Town of Churchill @TownofChurchill]

Sharing on behalf of Manitoba Natural Resources and Northern Development - Polar Bear Alert Statistics for the week of June 26 - July 2, 2023

[Alaska's News Source @AKNewsNow]

Dr. Craig George, 70, Utqiagvik, a respected scientist who’s work listening and watching people and animals in their natural environment touched lives across Alaska, has been missing since Wednesday when the raft he was on overturned. https://t.co/wMVzJz0nvt

[Andrew Derocher @AEDerocher]

Hudson Bay polar bears are hanging on to the last bits of ice. Bears can feed well into summer if they have ice & they'll keep putting on weight. No bear ever looked at its reflection in a melt pond and thought "I'm too fat". Survival of the fattest.

[Andrew Derocher @AEDerocher]

More Hudson Bay polar bears are ashore. Sea ice will melt quickly with warm weather. One bear way to the north: we'll see if she can make it home. Little ice left but bears will stay on it as long as they can & benefit by doing so as they can feed late into summer if there's ice.

[Andrew Derocher @AEDerocher]

All polar bears (but one) tracked by satellite are on the sea ice now so this year's cubs should be with their mothers refuelling for the summer ice-free period. A lot of movement to the NW since last week. These shifts usually occur as the bears hunt into or cross-wind.

[Andrew Derocher @AEDerocher]

New polar bear paper. Uses a biomarker to assess estrus & reproduction. Contributions from zoos on polar bears has spiked in recent years & provide new insights / methods.
https://t.co/3Ub0vZfPCg