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polar bear : a large creamy-white carnivorous bear (Ursus maritimus synonym Thalarctos maritimus) that inhabits arctic regions — Webster
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Polar bear (Ursus maritimus) is a hypercarnivorous bear whose native range lies largely within the Arctic Circle, encompassing the Arctic Ocean, its surrounding seas and surrounding land masses. It is a large bear, approximately the same size as the omnivorous Kodiak bear (Ursus arctos middendorffi). A boar (adult male) weighs around 350–700 kg (772–1,543 lb), while a sow (adult female) is about half that size. Although it is the sister species of the brown bear, it has evolved to occupy a narrower ecological niche, with many body characteristics adapted for cold temperatures, for moving across snow, ice and open water, and for hunting seals, which make up most of its diet. Although most polar bears are born on land, they spend most of their time on the sea ice. Their scientific name means “maritime bear” and derives from this fact. Polar bears hunt their preferred food of seals from the edge of sea ice, often living off fat reserves when no sea ice is present. Because of their dependence on the sea ice, polar bears are classified as marine mammals — Wikipedia
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Phys.org - latest science and technology news stories Phys.org internet news portal provides the latest news on science including: Physics, Nanotechnology, Life Sciences, Space Science, Earth Science, Environment, Health and Medicine.
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Some polar bears in far north are getting...
on September 23, 2020 at 4:28 pm
A small subpopulation of polar bears lives on what used to be thick, multiyear sea ice far above the Arctic Circle. The roughly 300 to 350 bears in Kane Basin, a frigid channel between Canada's Ellesmere Island and Greenland, make up about 1-2% of the world's polar bears.
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If Arctic ice melt doesn't boost sea levels, do...
on September 21, 2020 at 8:50 pm
US government scientists reported Monday that the Arctic Ocean's floating ice cover has shrivelled to its second lowest extent since satellite records began in 1979.
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Technique permits convenient, precise optical...
on September 21, 2020 at 3:00 pm
Often considered the workhorses of the body, proteins are among the most important biomolecules critical to life processes. They provide structural foundation for cells and tissues and perform a dizzying array of tasks, from metabolizing energy and helping cells communicate with one another to defending the body from pathogens and guiding cell division and growth.
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Heated rivalries for pollinators among arctic...
on September 11, 2020 at 2:55 pm
Insect pollination is as important to Arctic plants as it is to plants further south. When flowers abound, the plants have to compete for pollinators. Researchers at the University of Helsinki reveal that higher temperatures cause the flowering periods of different plant species to pile up in time. As a consequence, climate change may affect the competitive relationships of plants.
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Bridging America's divides requires a willingness...
on September 10, 2020 at 1:00 pm
Amid two crises—the pandemic and the national reckoning sparked by the killing of George Floyd—there have been anguished calls for Americans to come together across lines of race and partisanship. Change would come, a U.S. Today contributor wrote, only "when we become sensitized to the distress of our neighbors."