A male polar bear eats a piece of whale meat as it walks along the shore of Hudson Bay near Churchill, Manitoba.
Long Arctic summers are putting polar bears at higher risk of extinction than ever before, according to new research.
The study, published in the journal Nature Communications, shows they are unlikely to adapt to spending more time on land as they face greater risk of starvation.
Scientists observed 20 polar bears over a three-week period during the Arctic summer, looking at the ways they tried to conserve energy. Despite resting, scavenging and foraging for alternative foods, all of them rapidly lost weight.
They weighed the bears before and after the study period and on average found that they lost almost a kilogram each day.
‘Polar bears are not grizzly bears wearing white coats’
As summers in the Arctic get longer due to climate change, some scientists thought that these animals could adapt to living on land for extended periods by acting like their grizzly bear relatives.
Many of the male polar bears laid down to conserve energy, burning similar calories to when they hibernate. Other bears went searching for food, eating bird and caribou carcasses, kelp, berries and grasses.
But neither resting nor adapting their diet would allow polar bears to exist on land for extended periods of time, the study’s authors say.
‘Even those bears that were foraging lost body weight at the same rate as those that laid down,” explains Charles Robbins, director of the Washington State University Bear Center and co-author of the study.
‘Polar bears are not grizzly bears wearing white coats.”
Polar bears don’t adapt well to time spent on land
Polar bears spend the majority of their time on the sea ice where they hunt for seals, catching one to eat every few days. On land, the foods they can find have a much lower calorific content – they don’t have the fat content needed to sustain the bears.
Scientists also found that the bears struggled to eat carcasses they scavenged while swimming out in the water.
“The terrestrial foods did give them some energetic benefit, but ultimately, the bears had to spend more energy to access those resources,” says lead author Anthony Pagano, research wildlife biologist with the US Geological Survey Polar Bear Research Programme.
As ice-free periods get longer, the study suggests polar bears across the Arctic are at risk of starvation. And polar bear numbers have already declined by an estimated 30 per cent since 1987.
“As polar bears are forced on land earlier, it cuts into the period that they normally acquire the majority of the energy they need to survive,” Pagano adds.
“With increased land use, the expectation is that we’ll likely see increases in starvation, particularly with adolescents and females with cubs.”
News Related
-
Asylum seekers travel in an inflatable boat across the English Channel, bound for Dover on the south coast of England (Photo: Ben Stansall/AFP) Up to 40 Conservative MPs are poised to rebel over Rishi Sunak’s Rwanda deportation policy as they question ministers’ commitment to the scheme. A major row is ...
See Details:
Up to 40 Tory MPs ‘set to rebel’ if Sunak’s Rwanda plan doesn’t override ECHR
-
In the saltmarsh fringing where the Ballyboe River dissolves into Trawbreaga Bay, a little egret wears its plumage like a windblown stole. Our car swoops across the 10 arches of Malin bridge and we park along the village green. Malin is almost as far north as you can get on ...
See Details:
Country diary: A tale of three churches
-
Photograph: Chris Ratcliffe/EPA Hampton Court is an enduring monument to the power of Henry VIII, a pleasure palace down the Thames from Westminster and the City of London. On Monday it was the scene of power projection of a different kind, as Rishi Sunak pitched for investment from some of ...
See Details:
Sunak woos business elite with royal welcome – but they seek certainty
-
-
Tottenham interested in move to sign “fearless” £20m defender in January Tottenham Hotspur have joined the race to bring an overseas defender to the Premier League in January, according to a fresh report. Postecoglou’s centre-back options The Lilywhites currently have Micky Van De Ven, Ashley Phillips, Cristian Romero and Eric ...
See Details:
Tottenham interested in move to sign “fearless” £20m defender in January
-
A £100m campaign urging households and businesses to use less water will be funded from customers’ bills, Ofwat has said. Bill payers to stump up cost of £100m water usage campaign The regulator’s chief executive David Black told MPs that if the measures worked it would be cheaper than building ...
See Details:
Bill payers to stump up cost of £100m water usage campaign
-
FILE PHOTO: Soccer Football – FIFA Women’s World Cup Australia and New Zealand 2023 – Group B – Canada Training – Olympic Park, Melbourne, Australia – July 24, 2023 Canada’s Christine Sinclair during training REUTERS/Hannah Mckay/File Photo (Reuters) – BC Place in Vancouver, British Columbia, will be renamed “Christine Sinclair ...
See Details:
Soccer-Venue renamed 'Christine Sinclair Place' for Canada soccer great's final game
-
Michael van Gerwen is hunting down a fourth World Championship title (Picture: Getty Images) Michael van Gerwen is Phil Taylor’s tip to lift the World Darts Championship trophy for a fourth time in January, expecting a backlash from the recent defeat in the Players Championship Finals. The 2024 World Championship ...
See Details:
Phil Taylor makes his pick for 2024 World Darts Championship winner
-
Michael van Gerwen is hunting down a fourth World Championship title (Picture: Getty Images) Michael van Gerwen is Phil Taylor’s tip to lift the World Darts Championship trophy for a fourth time in January, expecting a backlash from the recent defeat in the Players Championship Finals. The 2024 World Championship ...
See Details:
Soccer-Howe aims to boost Newcastle's momentum in PSG clash
-
Michael van Gerwen is hunting down a fourth World Championship title (Picture: Getty Images) Michael van Gerwen is Phil Taylor’s tip to lift the World Darts Championship trophy for a fourth time in January, expecting a backlash from the recent defeat in the Players Championship Finals. The 2024 World Championship ...
See Details:
Hamilton heads for hibernation with a word of warning
-
Michael van Gerwen is hunting down a fourth World Championship title (Picture: Getty Images) Michael van Gerwen is Phil Taylor’s tip to lift the World Darts Championship trophy for a fourth time in January, expecting a backlash from the recent defeat in the Players Championship Finals. The 2024 World Championship ...
See Details:
Carolina Panthers fire head coach Frank Reich after 1-10 start to the season
-
Michael van Gerwen is hunting down a fourth World Championship title (Picture: Getty Images) Michael van Gerwen is Phil Taylor’s tip to lift the World Darts Championship trophy for a fourth time in January, expecting a backlash from the recent defeat in the Players Championship Finals. The 2024 World Championship ...
See Details:
This exercise is critical for golfers. 4 tips to doing it right
-
Michael van Gerwen is hunting down a fourth World Championship title (Picture: Getty Images) Michael van Gerwen is Phil Taylor’s tip to lift the World Darts Championship trophy for a fourth time in January, expecting a backlash from the recent defeat in the Players Championship Finals. The 2024 World Championship ...
See Details:
One in three households with children 'will struggle to afford Christmas'
-
OTHER NEWS
Kobbie Mainoo made his first start for Man Utd at Everton (Photo: Getty) The Football Association are reportedly confident that Manchester United starlet Kobbie Mainoo will choose to represent England ...
Read more »
Michael Smith will begin the defence of his world title on the opening night (Picture: Getty Images) The 2024 World Darts Championship is less than three weeks away and the ...
Read more »
For the first time a long haul commercial aircraft is flying across the Atlantic using 100% sustainable aviation fuel (SAF). A long haul commercial flight is flying to the US ...
Read more »
The King has met business and finance leaders from across the world at a Buckingham Palace reception to mark the conclusion of the UK’s Global Investment Summit. Charles was introduced ...
Read more »
After Ohio State’s 30-24 loss to Michigan Saturday, many college football fans were wondering where Lou Holtz was. In his postgame interview after the Buckeyes beat Notre Dame 17-14 in ...
Read more »
Darius Slay wouldn’t have minded being penalized on controversial no-call No matter which team you were rooting for on Sunday, we can all agree that the officiating job performed by ...
Read more »
New England Patriots quarterback Mac Jones (10) Quarterback Mac Jones remains committed to finding success with the New England Patriots even though his future is up in the air following ...
Read more »