The polar bear is part of the Arctic ecosystem and a food web through which carbon cycles. The ecosystem comprises phytoplankton, algae, a variety of animals and the natural environment.Continue Reading
The polar bear itself has no natural predators within its ecosystem and is thus supported by every other member of it, from the phytoplankton and algae that convert carbon dioxide from the ocean into organic carbon tissue to fish that feed on them, walruses and whales.
Unfortunately, scientific knowledge of the Arctic ecosystem is limited, owing to its inhospitable weather and the expense of mounting expeditions. Nevertheless, research has demonstrated conclusively that global warming is gradually and irrevocably destroying it.Learn more about Bears
The average polar bear is much larger than the average brown bear. Polar bears are considered the largest living carnivores on land, and large males often weigh more than a thousand pounds. Grizzly bears are actually a kind of brown bear; the two are not distinct.Full Answer >
The polar bear is considered by most experts to be the largest species of bear in the world. Males can reach weights of over 1,500 pounds, with the largest polar bear on record weighing over 2,200 pounds.Full Answer >
The world’s largest known bear from an existing species was an 11-foot-tall male polar bear that weighed 2,200 pounds, as Discovery News reported in February 2011. The largest recorded bear from an extinct species was at least 11 feet tall and weighed 3,500 pounds, according to National Geographic News.Full Answer >
Climate change affects polar bears in many negative ways, including decreased access to food, lower survival rates for cubs, damages to polar bear dens and a decrease in overall polar bear population. Many scientists point to climate change as the largest threat to polar bears.Full Answer >