GLOBAL WARMING: Arctic sea ice thins, so do polar bears


spaminator
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GLOBAL WARMING: Arctic sea ice thins, so do polar bears
Associated Press
More from Associated Press
Published:
February 1, 2018
Updated:
February 1, 2018 2:12 PM EST
In this April 15, 2015 photo provided by the United States Geological Survey, a polar bear wearing a GPS video-camera collar lies on a chunk of sea ice in the Beaufort Sea. A new study released on Thursday, Feb. 1, 2018 shows some polar bears in the Arctic are shedding pounds during the time they are supposed to be beefing up. Scientists blame climate change for shrinking the ice cover on the Arctic Ocean that the polar bears need for hunting.Anthony Pagano / AP
ANCHORAGE, Alaska — Some polar bears in the Arctic are shedding pounds during the time they should be beefing up, a new study shows. It’s the climate change diet and scientists say it’s not good.
They blame global warming for the dwindling ice cover on the Arctic Ocean that bears need for hunting seals each spring.
For their research, the scientists spied on the polar bears by equipping nine female white giants with tracking collars that had video cameras and the bear equivalent of a Fitbit during three recent springs. The bears also had their blood monitored and were weighed.
What the scientists found is that five of the bears lost weight and four of them lost 2.9 to 5.5 pounds (1.3 to 2.5 kilograms) per day. The average polar bear studied weighed about 386 pounds (175 kilograms). One bear lost 51 pounds (23 kilograms) in just nine days.
This April 20, 2015 photo provided by Busch Gardens shows a polar bear wearing a GPS video-camera collar lying on a chunk of sea ice in the Beaufort Sea. A new study released on Thursday, Feb. 1, 2018 shows some polar bears in the Arctic are shedding pounds during the time they are supposed to be beefing up. Scientists blame climate change for shrinking the ice cover on the Arctic Ocean that the polar bears need for hunting.
“You’re talking a pretty amazing amount of mass to lose,” said U.S. Geological Survey wildlife biologist Anthony Pagano, lead author of a new study in Thursday’s journal Science .
Researchers studied the bears for 10 days in April, when they are supposed to begin putting on weight so they can later have cubs, feed the cubs and survive through the harsh winter. But because the ice is shrinking, the bears are having a harder time catching seal pups even during prime hunting time, Pagano said. The United States Fish and Wildlife Service lists polar bears as a threatened species.
Polar bears hunt from the ice. They often wait for seals to pop out of holes to get air and at other times they swim after seals. If there is less sea ice and it is broken apart, bears have to travel more — often swimming — and that has serious consequences, such as more energy use, hypothermia and risk of death, said University of Alberta biology professor Andrew Derocher, who wasn’t part of the study.
The study found that on the ice, the polar bears burn up 60 per cent more energy than previously thought, based on these first real-life measurements done on the ice. A few of the bears travelled more than 155 miles (250 kilometres) in about 10 days off the northern coast of Alaska in the Beaufort Sea, Pagano said. The average bear female burned about 13,200 calories a day — six times more than an active human female.
In this June 15, 2014 photo provided by the United States Geological Survey, a polar bear rests on a chunk of sea ice in the Arctic. A new study released on Thursday, Feb. 1, 2018 shows some polar bears in the Arctic are shedding pounds during the time they are supposed to be beefing up. Scientists blame climate change for shrinking the ice cover on the Arctic Ocean that the polar bears need for hunting.
“Just to break even they have to capture at least one seal every five to 10 days — and that’s just to break even,” said study co-author George Durner, a USGS research zoologist. “And if they don’t do that they’re going to lose weight.”
The ice cover in the Arctic grows in the winter and melts in the summer. Because of climate change, the ice is shrinking and thinning more and earlier, he said.
As the ice dwindles, “we are essentially pulling the rug out from underneath the polar bears,” Durner said.
The bear videos showed researchers all sorts of usually private aspects of polar bear life, including courtship and hunting. They recorded dramatic, and at times, bloody seal hunts from the bear’s perspective.
“You’re seeing everything it is seeing,” Durner said.
Researchers only tracked female bears because males can’t keep collars on — their heads are too small and their necks too big — Pagano said.
Blaine Griffen, a Brigham Young University biology professor who wasn’t part of the study, praised the USGS work, noting that past studies have looked at resting polar bears and polar bears on treadmills in the lab.
In the long run, climate change “will result in smaller bears that produce fewer cubs and that have lower survival rates,” Griffen said in an email.
All over the Arctic, scientists have seen evidence of weakened polar bears, Pagano said. Last month, a video of a starving polar bear went viral, but it is from a different part of the Arctic and unlikely to be related to global warming, Durner said.
“If it’s bad for polar bears, it might be affecting us in other ways — us being humans,” Durner said. “It’s part of a larger picture.”
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Borenstein reported from Washington.
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Follow Seth Borenstein on Twitter at @borenbears . His work can be found here .
Follow Mark Thiessen on Twitter at @MThiessen . His work can be found here .
GLOBAL WARMING: Arctic sea ice thins, so do polar bears | Toronto Sun
 
Danbones
+1
#2  Top Rated Post
Quote:

In this April 15, 2015 photo provided by the United States Geological Survey

Polar bears are at their thinnest in April
They get fat for winter, which follows summer, which follows spring...

which fallows winter.
(duh!)

Say, we heard the staving polar bear thing before, and it turned out to be BS, when they actually counted the bears...also...

the "Classic PHOTO" turned out to be PHOTOSHOPPED!!!
 
Curious Cdn
#3
...by Hillary!

..inna Pizzeria!
 
mentalfloss
-1
#4
Meteorological Society Schools Trump On Global Warming
 
taxslave
+1
#5
Trump already knows it is a scam.
 
Walter
#6
Another fake news thread.
 
Twin_Moose
#7
Polar vortex tightens its icy grip, set to impact millions

Quote:

An injection of warm air, but in the wrong place, has set into motion a developing frigid pattern across most of Canada for the month of February and with it, an abundance of winter weather across the south.

This bullish push of mild temperatures near Alaska acts like a surgical knife as it thrusts into the Arctic circle and cuts into the coldest air on the planet, the polar vortex, forcing this region of frigid air to settle into more southern latitudes. This type of pattern can often lead to a dominant cold snap for many areas across Canada and will be the general feature for the month ahead – but it will have starkly different impacts depending on location.

WEATHER HIGHLIGHTS:
Polar vortex settles over Hudson Bay for much of February
Coldest air targets northern and central Canada, with periodic shots of bitter cold air across the south
Abundant winter weather ahead for many across southern Canada with several shots of snow
Important aside: While the polar vortex is a relatively new term in the media (ever since its influence on the infamous cold snap of 2014 in North America), it is not a new term for meteorologists. The first scientific papers of a circumpolar vortex were back in the late 1940's and early 50's and the tropospheric polar vortex is a constant feature found both at the North and South poles.

 
petros
#8
Are seal populations skyrocketing?