Фев 04 2018
High-tech collars on the bears recorded video, locations, and activity levels over a period of eight to 11 days, while metabolic tracers enabled the team to determine how much energy the bears expended.
The findings have scientists anxious about whether polar bears will be able to catch enough prey to meet their unexpectedly high energy needs and sustain their population. At the same time, a number of polar bear populations have been on the decline - for example, dropping by about 40 percent in the Beaufort Sea in the course of a decade.
But as the global temperature is rising, polar bears can face more trouble in future. They fitted the bears with collars carrying Global Positioning System trackers, accelerometers and video cameras.
As an apex predator in the Arctic (at the top of a food chain) the polar bear is a key component of the region's ecosystem but this new study confirms other studies showing climate could have a serious adverse effect on their survival. But he added, "I think it confirms all the reasons to be concerned about polar bears from a conservation perspective are intact". There, Arctic warming means the sea ice is breaking up earlier in the summer and returning later in the fall, forcing bears to spend more time on land.
Four other bears lost up to 10 percent of their body mass over the same period, the result of not catching seals.
"We've been documenting declines in polar bear survival rates, body condition, and population numbers over the past decade", says lead author Anthony Pagano, a Ph.D. candidate at the University of California Santa Cruz, quoted in a press release.
Polar bears could be sliding towards extinction faster than previously feared, with the animals facing an increasing struggle to find enough food to survive as climate change steadily transforms their environment. "The next step is to use this information to really start to quantify how changes in movement patterns might be affecting the energy demands of these 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.Читайте также: Putin opposition leader Alexei Navalny arrested after organizing fair election protests
Satellite telemetry shows several tagged polar bears moving long distances to remain on receding sea ice in July 2016.
The animals need to eat on average one adult (up to 70kg) or three subadult ring seals every 10 days to maintain their condition, and this hunting requires sea ice.
The huge glacial ice sheets in Greenland and Antarctica are reacting more slowly to the warming atmosphere and oceans but scientists are watching them closely as they will heavily influence sea level rise if there's significant melting.
Mr Pagano and his collaborators monitored the behaviour, hunting success and metabolic rates of bears as they hunted on the sea ice in the spring. The remote location has made it hard for scientists to study the bears' movement and activities until now.
So don't give up yet on the powerful polar bear.
Photos of skinny and emaciated polar bears are more common as their food disappears
Unfortunately, with the rapid environmental changes occurring in Arctic sea ice, the specialisation that once allowed polar bears to live in this challenging habitat has painted the animals into a physiological corner and led to devastating consequences.
Previous studies estimate the mortality of male polar bears would increase from 6 per cent to 48 per cent if fasting periods increased from 120 days to 180 days.При любом использовании материалов сайта и дочерних проектов, гиперссылка на обязательна.
Фев 04 2018
Uma Thurman Shares Intimate Details About Harvey Weinstein Assault
Quentin ( Tarantino ) used Harvey as the executive producer of Kill Bill , a movie that symbolizes female empowerment", she said. Harvey Weinstein's team is considering possible legal action against Uma Thurman , according to a new statement obtained by EW.
Фев 03 2018
Leicester City boss Claude Puel: 'Tough to manage Riyad Mahrez situation'
All I can say about the situation is that this is the best decision for Leicester, in the best interests of Leicester. Mahrez's continued absence means Puel will have an unchanged squad against Swansea.
Фев 02 2018
Pelicans, Bulls Reach Agreement On Nikola Mirotic Trade
That's not a bad haul for a Bulls team that has had Mirotic on the block for the vast majority of the season. Coincidentally, the Bulls waived Pondexter to make room for the incoming players.
Фев 01 2018
Nokia 3310 4G casually goes official in China, commercially launching next month
Above all, it also supports VoLTE as well as WiFi hotspot which is not present in the Jio Phone by Reliance Jio . It will be available in China and supports TD-LTE, the possibility of an global version is up in the air.
Фев 01 2018
United States names Hamas leader as terrorist
The U.S. has added the leader of Hamas to its list of worldwide terrorists, ratcheting up pressure on the Islamic terror group. The movement's leaders said they considered the USA decision as "ridiculous".
Фев 01 2018
Amazon, Berkshire Hathaway and JP Morgan to set up healthcare firm
But we also do not accept it as inevitable. "The solution will reportedly be 'free from profit-making incentives and constraints". Amazon's entry into the health market has been perceived as imminent, even though the company had announced nothing publicly.
Фев 01 2018
Alex Smith traded by Chiefs to Redskins, sources say
Cousins played under the franchise tag the last two seasons in D.C. and was set to become a free agent this off-season. In Kansas City's 27-20 win over the Eagles in Week 2, Smith was 21 of 28 for 251 yards and a touchdown.
Янв 31 2018
Russian team banned from Winter Paralympics, athletes to compete as neutrals
Beucher claimed the IPC had been influenced by external pressure to create a way in which Russian athletes can compete. The IPC said in a statement that "it is maintaining the suspension of the Russian Paralympic Committee (RPC)".
Янв 31 2018
Prince William, Kate Middleton take a shot at bandy in Sweden
The source explained: "She mentioned it to Joey who thought it was a brilliant idea". She has donated her hair to help make wigs for young patients.
Янв 30 2018
Cardi B Freaking Out Over A Note From U2's Bono Is Priceless
HollywoodLifers , are you excited for Cardi's performance? This is fu**ing Bono and he knows me. Cardi B wears Christian Louboutin at the 2018 Grammy Awards . "I am pretty nervous.
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