Sentences with phrase «polar bear researchers»

Crockford also reported the lack of consensus among polar bear researchers.

Yesterday, the BBC published a story that gave the two most alarmist polar bear researchers on the planet a forum to market their «polar bears are doomed» message.

Virtually all of the evidence generated by polar bear researchers shows that polar bears are not being harmed by declines in summer sea ice, and in some cases, they are doing very well indeed.

There have been substantial, sometimes rancorous, debates among polar bear researchers about this predator's prospects in a warming climate with less summer sea ice.

In an e-mail to ScienceInsider, Ian Stirling, a polar bear researcher at the University of Alberta in Canada, calls the 2006 paper a «very valuable observation... properly written up and published in a respected peer reviewed journal».

Presenting a thin veneer of objectivity, he quotes polar bear researcher Ian Stirling who suggested that Nicklen's photo shows a bear that most likely, but not certainly, died as a result of starvation related to sea ice melt.

Snopes quotes polar bear researcher Steve Amstrup, who's has flipped flopped on several bear issues over his career and whose «expertise model» has been severely criticized by colleagues in released emails.

Not exact matches

And researchers are not yet certain polar bears — which on ice lie in wait for, rather than chase after, prey — can do so on land.

In addition to the challenging weather, researchers have to watch out for polar bears.

The most striking result, researchers said, is the consistent trend across all polar bear regions for an earlier spring ice melt and a later fall freeze - up.

«This study shows declining sea ice for all subpopulations of polar bears,» said co-author Harry Stern, a researcher with the UW's Polar Science Center.

Across all 19 polar bear populations, the researchers found that the total number of ice - covered days declined at the rate of seven to 19 days per decade between 1979 and 2014.

For the first time, researchers have measured the energy expenditure of polar bears in the wild during the summer months.

It had been a different story at RAS's zoological museum a few days earlier, where she wasn't allowed to sample the bones she had come for because they were already covered with drill marks from other researchers who, like her, hoped to mine the relatively small number of ancient polar bear samples to reveal their evolutionary history.

Because their data consistently showed that black, brown and polar bears carry highly distinct Y chromosome lineages, the researchers also estimated the timing of the split between the male lineages of brown and polar bears.

By calibrating what scientists call the molecular clock — the hypothesis that mutation occurs at a predictable rate — to the panda separation 12 million years ago, one group of researchers suggests the polar bear's appearance as a species is a relatively recent phenomenon.

This seems to relate to another BOEMRE project, in which researchers at the University of Alberta in Edmonton, Canada, are radio - tracking polar bears.

If adaptation for survival in the Arctic environment has led to a less versatile immune system, then Arctic species such as the polar bear may be at risk from an influx of pathogens as global temperatures rise, the researchers warn.

«When we look forward several decades, climate models predict such profound loss of Arctic sea ice that there's little doubt this will negatively affect polar bears throughout much of their range, because of their critical dependence on sea ice,» said Kristin Laidre, a researcher at the University of Washington's Polar Science Center in Seattle and co-author of a study on projections of the global polar bear population.

Given how mobile giraffes are, one would expect a lot of interbreeding, so the researchers were surprised by how different the DNA could be — some genetic differences greater than those between a grizzly and a polar bear, which are separate species.

Given these two parameters, the researchers predicted that Neptune, which bears similar polar hotspots, should generate transient polar cyclones that come and go, while Jupiter should have none.

The researchers found that between 1985 and 1994, 62 % of polar bear dens were built on sea ice — but that number dropped to 37 % between 1998 and 2004.

The researchers» best guess is that the hairs are from either an unknown bear species or a hybrid of a brown bear and a polar bear.

Past studies by other researchers had looked at brown bear DNA in comparison to polar bear DNA, but this was the first time anyone had been able to get DNA material from Irish brown bears.

With more genomes in hand, researchers are teasing out when and how polar bears came to be so successful in such a harsh habitat.

In the latest sequencing effort, Willerslev and researchers from Denmark, China, and the United States analyzed the genomes of 80 polar bears from Greenland and 10 brown bears from North America and Europe.

Researchers worry that the polar bears, which are already in trouble due to retreating Arctic ice, could suffer from lack of access to prime food sources.

The researchers reached that conclusion by capturing more than two dozen polar bears, implanting temperature loggers and tracking their subsequent movements on shore and on ice in the Arctic Ocean's Beaufort Sea, north of Alaska and Canada, during 2008 - 2010.

Researchers observed 137 interactions between polar and grizzly bears at the bone pile (like the one pictured above, where a grizzly surveys the carcass as a polar bear feeds).

Because Kaktovik's polar bears seem especially susceptible to the Arctic's shrinking sea ice, researchers are concerned they may start relying more heavily on nutrient - poor food from land.

The 18 July suspension of government researcher Charles Monnett, originally thought to have been triggered by questions about his 2006 study of drowned polar bears (see background), actually relates to Monnett's management of $ 50 million in research contracts.

Wildlife researcher Joel Berger dons a polar bear outfit to study the reactions of musk oxen to the threat of bears increasingly driven onto the land for food.

The researchers attached tracking devices to 60 ringed seals and 67 polar bears overall, which allowed them to compare their movements before and after the ice collapse.

Charlotte Lindqvist of the University at Buffalo, New York, and an international team of researchers have just completed the most comprehensive analysis yet of the polar bear genome.

A tribute after the death of a young and innovative field researcher who used a scat - sniffing dog to help figure out polar bears» changing diets.Read more...

More recent trips caught footage of a pod of orcas teaching its young how to hunt, which digitally raced around the world of marine mammal scientists, participated in a penguin census, and logged polar bear and whale identification photos for researchers who track global populations of these animals.

An innovative use of radio collars has allowed researchers to gauge the long - distance swimming skills of polar bears in the Arctic Ocean waters north of Alaska.

The troubling part is that the low number was surprising to the researchers, who note that not only is it less than they thought they'd find, but it's far less than other large marine predators — even polar bears.

Anyone remember Charles Monnett, the bow whale researcher who published a monograph on dead polar bears?

Researchers Flee Stranded Bear - Scientists from the Wildlife Conservation Society had their field research on ecological impacts of eroding Arctic coasts near Prudhoe Bay interrupted by a polar bear that was stuck ashore because the sea ice in that part of Alaska was far offshBear - Scientists from the Wildlife Conservation Society had their field research on ecological impacts of eroding Arctic coasts near Prudhoe Bay interrupted by a polar bear that was stuck ashore because the sea ice in that part of Alaska was far offshbear that was stuck ashore because the sea ice in that part of Alaska was far offshore.

In my piece weighing the merits of very different strategies for giving ice - dependent polar bears a chance in a warming world, I promised I'd post the views of some of the biologists, sea - ice researchers and climate scientists who've been tracking relevant questions.

(Keep in mind that almost all Arctic sea ice researchers add a big caveat when talking of an «ice - free Arctic Ocean,» noting that a big region of thick floes north and west of Greenland will almost surely persist in summers through this century, which is one reason some scientists have proposed targeting polar bear conservation efforts there.)

While it is encouraging that polar bears can swim so far, it is also a potential risk for the bears, the researchers noted.

A second team of researchers has framed guidelines for the conservation of the polar bear, and proposed 15 measures that could determine the factors important in saving the creature from ultimate extinction.

Another group of researchers has established that things look bleak for Canada's polar bears, but this is just a subset of the species.

The new work, led by Rockwell and Linda Gormezano, a postdoctoral researcher in the Museum's Division of Vertebrate Zoology, examines how polar bears might compensate for energy deficits from decreasing seal - hunting opportunities.

In the second paper, published in summer 2013 in the journal Ecology and Evolution, researchers used polar bear scat to show that the diet of at least some of the bears has shifted from what it was 40 years ago, before climate change was affecting the Hudson Bay lowlands.

Researchers following a group of adult polar bears wearing GPS collars found a 45 percent mortality rate among the cubs of those who swam 30 miles or more at a time, as compared with an 18 percent mortality rate among the cubs of other polar bears.

Despite the strong upward trend in the polar bear population, government researchers forecast an immediate sharp downward trend based on forecasts of global warming.

And ``... Polar bears were fat, many looked like pigs», says polar researcher at the Norwegian Polar Institute, Jon Aars to the High North News.