United States scientists captured and fitted collars equipped with Global Positioning System and "bear cam" to nine cub-less female bears. Less sea ice means the bears have to work harder to find them.
"You're talking a pretty incredible amount of mass to lose", said US Geological Survey wildlife biologist Anthony Pagano, lead author of the study.
The scientists also analysed blood and urine samples taken at the beginning and end of each bear's 8-11 day journey across the ice fields to ascertain the animal's metabolic rate.
The problem is that many polar bears can't seem to find enough food to satisfy their high energy requirements.
Although polar bears have a larger range than other bears, the study also showed that because of declining sea ice the bears are having to swim and walk further than before to find seals, which increases energy expenditure.
While four bears put on weight, five bears lost up to 10 per cent of their body weight - between 18 and 20 kg - in 10 days.
United States to Fine UBS for Spoofing
Spoofing involves placing bids to buy or offers to sell futures contracts with the intent to cancel them before execution. The CFTC said Deutsche Bank had agreed to pay $30m to civil charges in the case, covering a period from 2008 to 2014.
But, the bears are likely to have.
"In the Beaufort Sea we are seeing that the ice is retreating much further to the north than it had historically", Mr Pagano said. The bears, therefore, are ending up burning more energy during the summer as they are fasting until the ice returns in the fall. But later in the year, after the bears' long summer fast, those young seals are older and wiser, meaning polar bears are not able to catch as many. Metabolic tracers were used to determine how much energy the bears expended. For example, scientists have thought that since the bears are primarily "sit-and-wait" hunters, they would minimize their energy use while hunting.
Their energy consumption as calculated during the study was 1.6 times higher than previously thought.
The scientists estimated that an active female polar bear needed around 51 megajoules of energy a day. "This study identifies the mechanisms that are driving those declines by looking at the actual energy needs of polar bears and how often they're able to catch seals".
Polar bears are listed as threatened under the US Endangered Species Act and as vulnerable by the International Union for the Conservation of Nature - a designation just short of endangered on both lists.
As the sea ice cover on Earth's polar regions continues to fragment and diminish, it has a clear and negative impact on some regional populations of polar bears in the Arctic.
"As they reduce that amount of time it follows that they catch fewer seals total and they are taking in a lower amount of energy". Then they attacked them by jumping on them. Previous studies found other animals are going without food longer than they did in the 1980s and 1990s, the study notes.
All over the Arctic, scientists have seen evidence of weakened polar bears, Pagano said.
As the ice dwindles, "we are essentially pulling the rug out from underneath the polar bears", Durner said. "Polar bears are reliant on seals for food and seals rely on sea ice".
But more tracking and monitoring will be necessary to fully understand what's happening to the bears.
Canada, home to two-thirds of the world's population of roughly 30,000 polar bears, has done a good job surveying subpopulations, making sure the polar bear trade is legally regulated, and incorporating traditional knowledge into polar bear management, the WWF said.
"You might get a very different picture on weight gain from many more individuals", he said.
Trump Zeroes in on Iran's Threats
To highlight the brutality and depravity of North Korea, Trump put victims of the Kim regime in the spotlight. "Otto Warmbier was a hardworking student at the University of Virginia", Trump said during his speech.
Earlier today, YouTube TV rolled out for Roku devices, another platform for which YouTube promised support previous year . It could also greatly complement a Netflix or Hulu subscription, especially for those aching to watch live TV channels.
The news comes after researchers tested the effects of e-cigarettes on mice, and human lung and bladder cells. In a new study, scientists warned that nicotine in e-cigarettes could convert into DNA-damaging chemicals.
Friday morning Mayor Bob Scott kicked off the event reading the Sioux City Wear Red Day Proclamation at Mercy Medical Center. During the event, Novant Health will highlight the top 10 cardiovascular and neurological advancements in the last decade.
DeRozan produced his 36th game with at least 20 points despite shooting 6 of 18 from the floor and missing 5 of 6 3-point tries. This was the most points scored in a game this season and the most scored by a player in franchise history for the Rockets.
And make no mistake, there is no doubt that Fisher will be in shape at some point before the February 26 deadline. The veteran player intends to begin skating and training on his own before joining the gold team for practices.
With the scores tied at 96, Thunder forward Josh Huestis tried to find Adams in the paint but the pass was intercepted. Oklahoma City will now have a day off, before meeting the Denver Nuggets in Denver on Friday.
A spokesman for the party said it will donate the $10,000 to "organizations that help victims of sexual harassment and abuse". Wynn Resorts has campaigned hard and invested heavily to develop its $2.4 billion casino resort in the state.
Facebook reported 1.4 billion daily active users in the fourth quarter - the slowest user growth on record. The focus on more "meaningful connections" is expected to make the company's long-term future more viable.
"To try to make this right, Epic is offering a full refund to every Paragon player for every purchase on any platform", it says. Did any of you guys play Paragon? The refund will come directly from Epic Games instead of platform providers or retailers.
Syrian opposition: Turkey to represent us at Sochi summit
The Congress wrapped up with a final statement that set up a 150-member committee tasked with creating a draft constitution. Representatives from various countries and global organizations were also invited as observers of the congress.
Google axed 700000 malicious Android apps in 2017
A popular (but dubiously accurate) critique of the Play Store is that it has relied too heavily on automation to approve apps. He also highlighted new detection models and approaches that can identify repeat offenders and abusive developer networks.
1 magnitude quake rattles northern Afghanistan: USGS
However, no casualties or damage have been reported yet in India but one person died and several injured in Balochistan. There have been no reports of damage in Kabul or in Islamabad, both of which were shaken by the impact.
Knicks and Joakim Noah looking to part ways
GM Scott Perry said earlier in the season he did not want to do that , as he liked having Noah's veteran presence around. As the Daily News reported, Noah shouted at Hornacek after being removed from last week's loss to the Warriors.