Medicine

Polar bears go hungry as the Arctic ice melts

Polar bears go hungry as the Arctic ice melts

With the cameras, as well blood sampling and other techniques, the researchers were able to follow the polar bear energy: Specifically, how much energy nine free-ranging female polar bears got from their prey, and how much energy the animals had to expend while roaming the sea ice in the Beaufort Sea off Alaska.

What makes it even more alarming is the fact that the bears were struggling to find food at the start of the period from April through July when these animals catch most of their prey and put on most of the body fat that help them sustain throughout the year. Data shows from 2004 to 2007 polar bears population in the Beaufort Sea has been gone down by 40 percent.

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. These trackers included accelerometers and GPS-equipped video cameras to document the bears' activities. The study reinforces the understanding that polar bears are reliant on a diet of fat-rich seals to survive in the energetically-demanding Arctic.

But more tracking and monitoring will be necessary to fully understand what's happening to the bears.

The bears' metabolic rate was more the 50 per cent higher than previous studies had suggested. "And if they don't do that they're going to lose weight".

Polar bears rely nearly exclusively on a calorie-loaded diet of seals.

Lead researcher Anthony Pagano noted that the polar bears were monitored during the period that polar bears catch most of their prey, and are expected to put on most of the body mass needed to sustain them throughout the year. "Polar bears are reliant on seals for food and seals rely on sea ice".

The data showed the bears were active about 35 percent of the time and resting for the remainder, yet they burned through 12,325 calories a day, much of it from their body reserves.

More news: Kennedy Explains Multiple Democratic SOTU Responses: Party Is 'Big Tent Party'

But scientists worry that ongoing climate-driven declines in Arctic sea ice, particularly during the warm months of the year, may be affecting the bears' hunting success. One female bear Griffen studied swam 426 miles over nine days.

Polar bears are now listed as vulnerable on the International Union for Conservation of Nature's Red List of Threatened Species.

Although it's just a 10-day snapshot, the study confirms that polar bears aren't made for walking, said Andrew Derocher, Canada's leading polar bear expert and a professor at the University of Alberta.

Polar bears are starving during their prime hunting period as Arctic ice melts because of climate change, according to a U.S. study published Thursday that analysed the animals' metabolism for the first time.

However, human-induced climate change reductions in sea ice have caused declines in the number of bears, with young polar bears having a higher mortality rate than adults.

Until now, there's been little information available on polar bears' daily energy demands and how they're affected by their day-to-day movements. This is the time when bears give birth pups.

A study by the U.S. Geological Survey and the University of California Santa Cruz published in the journal Science Thursday found that polar bears have a higher metabolism than previously thought and are having trouble finding enough food to meet their energy needs as climate change alters their environment. Polar bears rely on seals for their vast caloric needs-the four bears that lost 10% of their weight didn't catch a single seal during the study and relied on scavenging-and sea ice is pretty much a requirement for polar bears to catch seals.


  • PM&C, ABC come to agreement on return of 'The Cabinet Files'

    PM&C, ABC come to agreement on return of 'The Cabinet Files'

    Deputy Prime Minister Barnaby Joyce told ABC radio Thursday that there had been a serious breach of security . The Department of Prime Minister and Cabinet on Wednesday announced an urgent investigation into the leak.
    Former GOP governor chosen as Michigan State's interim president

    Former GOP governor chosen as Michigan State's interim president

    Engler said there are aspects of his post-politics career that have made him more prepared for leading MSU through this crisis. Meanwhile, the state's attorney general has opened an investigation into the school's handling of complaints against Mr.
    Helicopter crashes into home in Newport Beach

    Helicopter crashes into home in Newport Beach

    Two other people were injured in the incident, officials said, but it is unclear how numerous victims were on board the aircraft. The woman said the residents of the home that was struck were there, but were in another part of the property and were unharmed.
  • Black unemployment rose sharply in January, as Trump bragged about record lows

    Black unemployment rose sharply in January, as Trump bragged about record lows

    However, after a divisive 12 months his entreaties to the right of the House seemed to fall on deaf ears. This does not mean, however, that there is necessarily a sudden crisis in the black community.
    EA Calls Star Wars Battlefront II Backlash a

    EA Calls Star Wars Battlefront II Backlash a "Learning Opportunity"

    In addition to the above, Jorgensen said that it's not just EA, but the entire games industry that thinks this way. The free-to-play FIFA Mobile is also doing very well for itself, adding 26 million new players this past quarter.
    Play as Ryu and Sakura in Monster Hunter

    Play as Ryu and Sakura in Monster Hunter

    Those that pre-ordered the game will be getting some special bonuses like the Origin Set Armor and the Fair Wind Charm. The game will also be released on PC but so far, the PC version has not been given a release date yet.
  • Uma Thurman Reveals Horrifying Kill Bill Ordeal With Tarantino And Weinstein

    Uma Thurman Reveals Horrifying Kill Bill Ordeal With Tarantino And Weinstein

    Thurman says when she expressed fear about driving a possibly faulty vehicle in Tarantino's " Kill Bill: Vol. 1" he insisted. Weinstein had invited Thurman to his room for a meeting about a script in a Paris hotel, where he was dressed in a bathrobe.
    Harbor Country Day School Faculty & Staff

    Harbor Country Day School Faculty & Staff "Go Red for Women"

    Every Macy's customer will get a second pin for free to give to a friend or family member when they buy one this year. Help the American Heart Association meet their fundraising goal of $2 million by donating at.
    Serie A club make contact with Man Utd regarding deadline day transfer

    Serie A club make contact with Man Utd regarding deadline day transfer

    Maybe if we had a few days, a week perhaps [a deal would be possible], but we've only got a few hours, so it's really very hard ". The club's major transfer business was concluded with the stunning swap deal involving Alexis Sanchez and Henrikh Mkhitaryan.
  • Huawei Mate 9 gets Android Oreo update in the US

    Huawei Mate 9 gets Android Oreo update in the US

    In order to become part of the beta program though, you have to sideload the Android Oreo operating system onto your device. Essential released a statement saying that there were stability issues when the company was going through the beta program.
    Aubameyang Arsenal Debut in Doubt due to Illness - Wenger

    Aubameyang Arsenal Debut in Doubt due to Illness - Wenger

    So, it seems that Henrikh Mkhitaryan will definitely feature for the Gunners but Pierre-Emerick Aubameyang may not return in time. The French-born Gabon global scored 141 goals in 213 games across four-and-a-half seasons with Borussia Dortmund .
    Government won't retry New Jersey Sen. Bob Menendez on corruption charges

    Government won't retry New Jersey Sen. Bob Menendez on corruption charges

    Prosecutors lacked smoking-gun evidence and failed to prove a corrupt bargain between the senator and the doctor, he said. The prosecutors argued that the senator began taking bribes from Melgen shortly after he entered the Senate in 2006.