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The North Cascades Ecoregion is a Level III ecoregion in the Commission for Environmental Cooperation's classification system. [1] The terrain of the North Cascades is composed of high, rugged mountains. It contains the greatest concentration of active alpine glaciers in the conterminous United States and has a variety of climatic zones.
Examples of amphibian species occurring in the North Cascades include the western toad (Bufo boreas) and the rough-skinned newt (Taricha granulosa). [26] The biodiversity of the area is threatened by global climate change and invasive exotic plant species. [24] These exotic plants thrive by utilizing manmade structures such as roads and trails ...
The Cascades is bordered on the north by the North Cascades ecoregion, on the south by the Klamath Mountains ecoregion, on the east by the Eastern Cascades Slopes and Foothills, and on the west by the Willamette Valley and Puget Lowland ecoregions. It been subdivided into six Level IV ecoregions in Washington and Oregon, as described below ...
Few other North American national parks have recorded as many vascular plant species as have been documented in North Cascades National Park. With 1,630 species documented, experts estimate adding non-vascular plants and fungi could more than double the number of known plant species.
The classification system has four levels. Levels I, III, and IV are shown on this list. Level I divides North America into 15 ecoregions; of these, 3 are present in Oregon. Level III subdivides the continent into 182 ecoregions; of these, 9 lay partly within Oregon's borders. Level IV is a further subdivision of Level III ecoregions.
The CEC was established in 1994 by the member states of Canada, Mexico, and the United States to address regional environmental concerns under the North American Agreement on Environmental Cooperation (NAAEC), the environmental side accord to the North American Free Trade Agreement (NAFTA).
An example of a keystone species in the North American deserts would be the coyote or mountain lion. These two predators can control the population and distribution of a large number of prey species. A single mountain lion can roam an area of hundreds of kilometers, in which deer, rabbits, and bird species are partly controlled by a predator of ...
The range of the Cascade red fox is estimated to be 4,500 square kilometres (1,700 sq mi) but may be as large as 40,000 square kilometres (15,000 sq mi). [3] It lives in the subalpine meadows and parklands of the Cascade Mountains, as well as the open forests on the eastern slope.