It is 1 of 6 subspecies of brown bear (Ursus arctos). (Größe und Länge), Der Grizzlybär lebt vor allem in Nordamerika (Gewicht), Er hat eine Größe von bis zu 2 m. An area that has been dug by the grizzly bear has significantly more nitrogen than an undisturbed area. [31], There are currently about 55,000 wild grizzly bears located throughout North America, 30,000 of which are found in Alaska. [46] Although inland or Rocky Mountain grizzlies spend nearly half of their life in dens, coastal grizzlies with better access to food sources spend less time in dens. [103] Along with increasing species richness, soil disturbance causes nitrogen to be dug up from lower soil layers, and makes nitrogen more readily available in the environment. The other big cat present in the United States which might pose as a threat to bears, is the jaguar;[94] however, both species have been extirpated in the regions of the Southwest where their former habitats overlapped, and grizzlies remain far absent from the regions along the U.S.-Mexico border, where jaguars appear to be returning. [124], Bear awareness programs have been developed by numerous towns in British Columbia, Canada, to help prevent conflicts with both black and grizzly bears. When this happens, it is usually with the grizzly being the aggressor. [149] Using GPS collar tracking, scientists can study whether or not these efforts are actually making a positive contribution towards resolving the problem. [140] In 2010, the provincial government formally listed its population of about 700 grizzlies as "Threatened". With the high fat content of salmon, it is not uncommon to encounter grizzlies in Alaska weighing 540 kg (1,200 lb). When a grizzly descends on a cougar feeding on its kill, the cougar usually gives way to the bear. [120] Most grizzly bear attacks result from a bear that has been surprised at very close range, especially if it has a supply of food to protect, or female grizzlies protecting their offspring. [165], Admiralty Island, in southeast Alaska, was known to early natives as Xootsnoowú, meaning "fortress of bears," and is home to the densest grizzly population in North America. [109] This provides evidence grizzly bears represent a keystone predator, having a major influence on the entire ecosystem they inhabit. [54], The average lifespan for a male is estimated at 22 years, with that of a female being slightly longer at 26. [3] They also inhabited North Africa and the Middle East. Grizzly bears do not defecate or urinate throughout the entire hibernation period. Salmon are at a disadvantage when they leap waterfalls because they cluster together at their bases and are therefore easier targets for the grizzlies. [80][81] In northern Alaska, grizzly bears often encounter muskox. Author: Ord, 1815. [55] Females live longer than males due to their less dangerous life; they do not engage in seasonal breeding fights as males do. Rausch found that North America has but one species of grizzly. These can include blueberries, blackberries (Rubus fruticosus), salmon berries (Rubus spectabilis), cranberries (Vaccinium oxycoccos), buffalo berries (Shepherdia argentea), soapberries (Shepherdia canadensis), and huckleberries (Vaccinium parvifolium), depending on the environment. 5 menschliche Todesfälle pro Jahr verantwortlich. Wie gefährlich ist der Grizzlybär für den Menschen? [147] The purpose of this refuge is to provide awareness and education to the public about grizzly bears, as well as providing an area for research and observation of this secluded species. (ursus arctos arctos) und erreichen in der Regel Gewichte bis 350 Kilogramm und Deckenlängen bis 250 Zentimeter, selten mehr. In the recovery areas that adjoin Canada, bears also move back and forth across the international boundary. The male grizzly bear's hibernation ends in early to mid-March, while females emerge in April or early May. Fish and Wildlife Service concentrates its effort to restore grizzly bears in six recovery areas. These are Northern Continental Divide (Montana), Yellowstone (Montana, Wyoming, and Idaho), Cabinet-Yaak (Montana and Idaho), Selway-Bitterroot (Montana and Idaho), Selkirk (Idaho and Washington), and North Cascades (Washington). Is creating a decline in genetic diversity, and bees are eaten if they are available [ 166 ] place... 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