Sentences with phrase «sea polar bear population»

The Arctic Refuge's coastal plain provides the most important land denning habitat for the Beaufort Sea polar bear population.

Not exact matches

After a report about four drowned polar bears seen far out at sea, they were put on the USA threatened list — even though there has been no demonstrated diminution in population.

A new University of Washington study, with funding and satellite data from NASA and other agencies, finds a trend toward earlier sea ice melt in the spring and later ice growth in the fall across all 19 polar bear populations, which can negatively impact the feeding and breeding capabilities of the bears.

Nineteen separate polar bear populations live throughout the Arctic, spending their winters and springs roaming on sea ice and hunting.

«When we look forward several decades, climate models predict such profound loss of Arctic sea ice that there's little doubt this will negatively affect polar bears throughout much of their range, because of their critical dependence on sea ice,» said Kristin Laidre, a researcher at the University of Washington's Polar Science Center in Seattle and co-author of a study on projections of the global polar bear population.

The team then plugged their sea ice figures into a model of polar bear populations.

The study, published in a recent issue of the journal Ecography, was accomplished using satellite - linked telemetry - tracked populations of polar bears in the Beaufort Sea and Hudson Bay.

As sea ice disappears, polar bear populations will crash harder than the seabirds.

A comprehensive review (pdf) by the US Fish and Wildlife Service concluded that shrinking sea ice is the primary cause for the decline seen in these populations, and it recently proposed listing polar bears as threatened (pdf) under the Endangered Species Act.

The likelihood of serious sea level rise under «business as usual», and impacts on water resources may not have the acute drama associated with polar bear population decline or the possibility of massive methane clathrate releases, but they are much more likely to figure on policy makers agendas — just as other long term chronic issues (such as pensions) do.

There is rising concern among polar bear biologists that the big recent summertime retreats of sea ice in the Arctic are already harming some populations of these seal - hunting predators.

Steven C. Amstrup, the federal biologist who led an analysis last year concluding that the world's polar bear population could shrink two thirds by 2050 under moderate projections for retreating summer sea ice, is once again in the field along Alaska's Arctic coast, studying this year's brood of cubs, yearlings and mothers.

Based on studies of radio - collared polar bears of the Beaufort Sea population between 1981 and 2000, 53 dens were located on the mainland coast of Alaska and Canada.

* Monitor polar bear populations and trends * Study polar bear feeding ecology * Work cooperatively with the Alaska Nanuuq Commission and the North Slope Borough for co-management of polar bears in Alaska * Provide technical assistance to the participants of the 1988 North Slope Borough Inuvialuit (In new vee al u it) Game Council Agreement for the conservation of polar bears in the southern Beaufort Sea region and monitor the effects of oil and gas operations in the Beaufort Sea region.

Models created by experts said such a dramatic loss of sea ice would cause a sharp drop in the polar bear population and threaten their very survival.

It is a very complex issue with no clear cut answers however as it is critical for polar bears to have both ice and water any reduction of sea ice is going to reduce the population over the next few decades.

A bit more good news about polar bear populations, this time from an abundance study in the Southern Beaufort Sea.

The International Conservation Union, in its latest red list of endangered wildlife, gave polar bears threatened status in May, projecting a decline of 30 percent by midcentury from current populations, mainly due to projected losses of sea ice in a warming world.

Retreating sea ice is associated with polar bear populations, which makes it another symbol for climate change.

Activist polar explorer Børge Ousland's told National Geographic that more polar bear encounters on land are due to reduced sea ice — without any reference to population changes over that time or revealing when or where these observations were made.

Tagged activist, climate change, encounters, explorer, glaciers, Ice Legacy, Kara Sea, National Geographic, polar bear, population size, problem bears, sea ice, Severnaya ZemSea, National Geographic, polar bear, population size, problem bears, sea ice, Severnaya Zemsea ice, Severnaya Zemlya

Tagged Amstrup, BBC, Carbon Brief, declining population, declining sea ice, Derocher, GWPF, IUCN Polar Bear Specialist Group, Kara Sea, media attention, PBSG, polar bears, population estimates, rapid response team, The Times, threatened, vulnerable, Webssea ice, Derocher, GWPF, IUCN Polar Bear Specialist Group, Kara Sea, media attention, PBSG, polar bears, population estimates, rapid response team, The Times, threatened, vulnerable, WebsSea, media attention, PBSG, polar bears, population estimates, rapid response team, The Times, threatened, vulnerable, Webster

Tagged Arctic basin, genetic bottleneck, ice age, last glacial maximum, LGM, perennial ice, Pleistocene, polar bear, population bottleneck, population decline, ringed seal, sea ice, sea ice habitat, sea level, seasonal ice

Tagged Arctic, attacks, biggest threat, Churchill, facts, ice growth, last glacial maximum, minimum, polar bear, polar bear alert, population size, problem bears, Refuge, resilience, sea ice, September, summer, thick spring ice

Tagged Amstrup, average global temperature, Bayesian models, BBC, climate change, Derocher, extinct, future climate, future population decline, global warming, polar bear, sea ice declines, sea ice models

The overall polar bear population appears stable, but disappearing sea ice in the Arctic is widely believed to pose a long - term threat to the species.

Tagged Barber and Iacozza, bearded seal, beluga whales, Gulf of Boothia, local Inuit knowledge, M'Clintock Channel, multiyear ice, narwhal, polar bear population density, ringed seal, sea ice habitat, Thiemann

(on polar bear populations and sea level rise)

Despite Center for Biological Diversity assertions that «Arctic sea ice melt is a disaster for the polar bears», research shows polar bear populations have continued to thrive and increase.

Which experts on sea level rise, ice sheet dynamics, and polar bear biology / ecology did you contact for your articles on polar bear populations and sea level rise?

Tagged Davis Strait, expert, harp seals, Labrador, Newfoundland, onshore, polar bears, population increase, sea ice, sightings

Tagged Black Tickle, Charlottetown, climate change, Davis Strait, encounters, facts, Labrador, Newfoundland, Perry Trimper, polar bears, population increase, range contraction, sea ice, sightings

Barents Sea polar bears (Ursus maritimus): population biology and anthropegenic threats.

Once you presuppose that climate change is happening, it doesn't take a leap of faith to incorporate the assumption into models to estimate the health of polar bear populations, the progress of glaciers, and the vulnerability of Arctic sea ice.

There is a widespread idea that there are actual and robust measurements of polar bear populations, the extent of glaciers, the rate of sea - level rise, and the extent of polar sea ice.

Taylor also debunked the notion that less sea ice means less polar bears by pointing out that southern regions of the bears» home with low levels of ice are seeing booming bear populations.

Tagged Beaufort Sea, climate change, Derocher, Eastern Beaufort, extinction, feeding, future, global warming, IUCN Polar Bear Specialist Group, models, Pilfold, polar bear, population, predation, predictions, Red list, ringed seals, Southern Beaufort, Stirling, thick spring ice, threatBear Specialist Group, models, Pilfold, polar bear, population, predation, predictions, Red list, ringed seals, Southern Beaufort, Stirling, thick spring ice, threatbear, population, predation, predictions, Red list, ringed seals, Southern Beaufort, Stirling, thick spring ice, threatened

Tagged decline, global warming, hypothesis, IUCN Red List, observations, polar bear, population size, predictions, sea ice, USFWS

Announcing the publication today of Version 3 2 of my paper that tests the hypothesis that polar bear population declines result from rapid declines in summer sea ice, updated with recently available data.

Polar bears are one of the most sensitive Arctic marine mammals to climate warming because they spend most of their lives on sea ice.35 Declining sea ice in northern Alaska is associated with smaller bears, probably because of less successful hunting of seals, which are themselves ice - dependent and so are projected to decline with diminishing ice and snow cover.36, 37,38,39 Although bears can give birth to cubs on sea ice, increasing numbers of female bears now come ashore in Alaska in the summer and fall40 and den on land.41 In Hudson Bay, Canada, the most studied population in the Arctic, sea ice is now absent for three weeks longer than just a few decades ago, resulting in less body fat, reduced survival of both the youngest and oldest bears, 42 and a population now estimated to be in decline43 and projected to be in jeopardy.44 Similar polar bear population declines are projected for the Beaufort Sea regionsea ice.35 Declining sea ice in northern Alaska is associated with smaller bears, probably because of less successful hunting of seals, which are themselves ice - dependent and so are projected to decline with diminishing ice and snow cover.36, 37,38,39 Although bears can give birth to cubs on sea ice, increasing numbers of female bears now come ashore in Alaska in the summer and fall40 and den on land.41 In Hudson Bay, Canada, the most studied population in the Arctic, sea ice is now absent for three weeks longer than just a few decades ago, resulting in less body fat, reduced survival of both the youngest and oldest bears, 42 and a population now estimated to be in decline43 and projected to be in jeopardy.44 Similar polar bear population declines are projected for the Beaufort Sea regionsea ice in northern Alaska is associated with smaller bears, probably because of less successful hunting of seals, which are themselves ice - dependent and so are projected to decline with diminishing ice and snow cover.36, 37,38,39 Although bears can give birth to cubs on sea ice, increasing numbers of female bears now come ashore in Alaska in the summer and fall40 and den on land.41 In Hudson Bay, Canada, the most studied population in the Arctic, sea ice is now absent for three weeks longer than just a few decades ago, resulting in less body fat, reduced survival of both the youngest and oldest bears, 42 and a population now estimated to be in decline43 and projected to be in jeopardy.44 Similar polar bear population declines are projected for the Beaufort Sea regionsea ice, increasing numbers of female bears now come ashore in Alaska in the summer and fall40 and den on land.41 In Hudson Bay, Canada, the most studied population in the Arctic, sea ice is now absent for three weeks longer than just a few decades ago, resulting in less body fat, reduced survival of both the youngest and oldest bears, 42 and a population now estimated to be in decline43 and projected to be in jeopardy.44 Similar polar bear population declines are projected for the Beaufort Sea regionsea ice is now absent for three weeks longer than just a few decades ago, resulting in less body fat, reduced survival of both the youngest and oldest bears, 42 and a population now estimated to be in decline43 and projected to be in jeopardy.44 Similar polar bear population declines are projected for the Beaufort Sea regionSea region.45

Although young ringed seals are considered the primary prey of polar bears throughout the Arctic, young harp seals undoubtedly represent an increasingly important resource for populations of Davis Strait, East Greenland and Kara Sea bears.

In the eastern Beaufort Sea and Amundsen Gulf, research on polar bear populations and their ecological interrelationships with seals and sea ice conditions began in the fall of 19Sea and Amundsen Gulf, research on polar bear populations and their ecological interrelationships with seals and sea ice conditions began in the fall of 19sea ice conditions began in the fall of 1970.

Therefore, due to entirely natural variations in spring snow conditions over sea ice (and thickness of the ice), 2 polar bear population sizes can vary by region.

Tagged climate change, conservation, extinction, global warming, grizzly, grolar, hungry, hybrid, Pearse, pizzly, polar bear, population size, sea ice, starving, survivors

Most female polar bears in the Beaufort Sea breed for the first time at 5 years of age, compared to 4 years of age in most other populations, and cubs normally remain with their mothers for 2.5 years prior to weaning.

Regehr, E. V., N. J. Lunn, S. C. Amstrup, and I. Stirling, 2007: Effects of earlier sea ice breakup on survival and population size of polar bears in western Hudson Bay.

With virtually all CAGW projections diverging further from reality, CAGW's survival depends on propagandizing lies and half - truths: the «97 %» meme, severe weather, sea levels, global warming trends, ocean acidification, polar bear and penguin populations, polar ice caps, etc., are all supposedly worsening at «unprecedented» rates.

Scientists fear melting sea ice could one day make killer whales the Hudson Bay's top predator, a startling ecosystem shift and a blow for Inuit populations already reeling from dwindling polar bear numbers.

Three decades of melting sea ice has led to significant weight loss among the world's southernmost population of polar bears, new data from Canadian researchers suggests.

While the dramatic loss of weight has not led to a decline in the population of polar bears, that could change as a warming Arctic continues to melt away sea ice.