Historical range of Brown bear

The brown bear is a bear that is found across much of northern Eurasia (Europe [Russia, Scandinavia, Caucasus, Romania, Anatolia], Central Asia, China) and North America (United States, Canada).

Brown bears were once native to much of Asia, some parts of the Atlas Mountains of Africa and most of Europe and North America, but are now extinct in some areas and their populations have greatly decreased in other areas. Currently, the brown bear population is approximately 200 thousand individuals.

The largest populations are in Russia with 120 thousand, the U.S. with 32 thousand, Canada with around 25 thousand and Romania with around 5 thousand.
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Ecoclimax is defined by Odum (1969) as the culmination state after a succession in a stabilized ecosystem in which maximum biomass (or high information content) and symbiotic function among organisms is kept per unit of available energy flow.