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The polar bear (Ursus maritimus) is a large bear native to the Arctic and nearby areas. It is closely related to the brown bear, and the two species can interbreed. The polar bear is the largest extant species of bear and land carnivore, with adult males weighing 300–800 kg (660–1,760 lb). The species is sexually dimorphic, as adult females ...
The key danger for polar bears posed by the effects of climate change is malnutrition or starvation due to habitat loss.Polar bears hunt seals from a platform of sea ice. Rising temperatures cause the sea ice to melt earlier in the year, driving the bears to shore before they have built sufficient fat reserves to survive the period of scarce food in the late summer and early fall.
Susan J. Crockford. Susan Janet Crockford is a Canadian zoologist and climate change denialist known for her research and publications on polar bears. From 2004 to 2019 she was an adjunct professor in Anthropology at the University of Victoria. [1]
Arctic ecology. A sunset in the arctic region. Arctic ecology is the scientific study of the relationships between biotic and abiotic factors in the arctic, the region north of the Arctic Circle (66° 33’N). [1] This region is characterized by two biomes: taiga (or boreal forest) and tundra. [2] While the taiga has a more moderate climate and ...
Ursus (mammal) Ursus. (mammal) Ursus is a genus in the family Ursidae (bears) that includes the widely distributed brown bear, [3] the polar bear, [4] the American black bear, and the Asian black bear. The name is derived from the Latin ursus, meaning bear. [5][6]
Churchill, Manitoba, is known throughout the world as the place where hundreds of polar bears gather each fall to wait for the sea ice to return to Hudson Bay.The town is also a hub for Polar Bears International and several of PBI's programs including Tundra Connections webcasts [6] – free, live webcasts provided by polar bear and climate scientists and geared towards students, families and ...
A study published Thursday in Science’s Policy Forum says scientists for the first time are able to directly quantify the impact of human-caused greenhouse gas emissions from specific sources on ...
Tundra of North America. The location of the tundra in North America is highlighted in light blue. The Tundra of North America is a Level I ecoregion of North America designated by the Commission for Environmental Cooperation (CEC) in its North American Environmental Atlas. One of the planet's most recent biomes, a result of the last ice age ...