Ecoregions

An ecoregion is a contiguous area characterized by well defined similarity in flora and fauna as well as geomorphology, climate and soils; ecoregions are generally relatively large geographic units on the order of 50,000 square kilometers or more. Ecoregions may be terrestrial or marine, and do not recognize any political boundaries or landscape alterations by humans. Generally an ecoregion is depicted by a geographic descriptor coupled with a biome identity, further articulating one or more specific climatic or dominant plant community appellations: for example, Chilean Mattoral or Madagascar Dry Deciduous Forests.

There are several alternative formal naming schemes for the Earth's ecoregions; one of the most widely used, developed by the World Wildlife Foundation, recognizes 867 separate ecoregions. Because of the very large scale of an ecoregion, the landscape is not monolithic, but may have pockets of ecological diversity; however, the ecoregion is defined by its preponderant vegetative, geological and meteorological composition.  Correspondingly boundaries between regions are sometimes diffuse, resulting in a broad ecotone.

 

  • Ecoregion Featured Article Ecoregion Ecoregion

    An ecoregion is a relatively large unit of land or sea that contains geographically distinct assemblage of natural communities with boundaries that approximate the original extent... More »

  • Jalisco dry forests Featured Article Jalisco dry forests Jalisco dry forests

    WWF Terrestrial Ecoregions Collection The Jalisco dry forests on the Pacific coast of Mexico is characterized by low lying mountains and a... More »

  • Belizean coast mangroves Featured Article Belizean coast mangroves Belizean coast mangroves

    The Belizean coast mangroves ecoregion (part of the larger Mesoamerican Gulf-Caribbean mangroves ecoregion) extends along the Caribbean Coast from Guatemala, encompassing the... More »

  • Borneo peat swamp forests Featured Article Borneo peat swamp forests Borneo peat swamp forests

    WWF Terrestrial Ecoregions Collection Although the Borneo peat swamp forests are not as biodiverse as neighbouring lowland rainforests, the... More »

  • Great Victoria Desert Featured Article Great Victoria Desert Great Victoria Desert

    WWF Terrestrial Ecoregions Collection A vast, sparsely populated region covered by dunefields and gibber plains, the Great Victoria Desert... More »

  • Magellanic subpolar forests Featured Article Magellanic subpolar forests Magellanic subpolar forests

    WWF Terrestrial Ecoregions Collection The Magellanic subpolar forests is an ecoregion dominated by trees of the genus Nothofagus; this... More »

  • Patagonian steppe Featured Article Patagonian steppe Patagonian steppe

    WWF Terrestrial Ecoregions Collection The Patagonian steppe ecoregion extends approximately from the mid-Andean Precordillera southward,... More »

  • Angolan mopane woodlands Featured Article Angolan mopane woodlands Angolan mopane woodlands

    WWF Terrestrial Ecoregions Collection The Angolan Mopane Woodlands are located in northern Namibia and  southern Angola, completely... More »

  • Ecoregions of Chile Featured Article Ecoregions of Chile Ecoregions of Chile

    Chile has eight ecoregions that occur entirely or partly within its borders on the mainland and three ecorgions offshore: Sechura desert Atacama... More »

Recently Updated
Sierra Nevada forests Last Updated on 2015-01-29 19:20:06 WWF Terrestrial Ecoregions Collection The Sierra Nevada forests are the forested areas of the Sierra Nevada Mountains, which run northwest to southwest and are approximately 650 kilometers long and 80 km wide. The range achieves its greatest height towards the south, with a number of peaks reaching heights of over 4000 meters. Several large river valleys dissect the western slope with dramatic canyons. The eastern escarpment is much steeper than the western slope, in general.   The range supports a diverse set of natural communities with many endemic species and extraordinary habitats. A significant fraction of the land area in the Sierra Nevada Mountains is unforested, since elevations above the treeline do not support even conifer growth. This ecoregion is part of the Nearctic Realm. The Sierra Nevada forests ecoregion harbors one of... More »
Wasatch and Uinta montane forests Last Updated on 2015-01-27 12:38:28 WWF Terrestrial Ecoregions Collection The Wasatch and Unita montane forests ecoregion is a distinct block of high montane habitat stretching from southeastern Idaho and extreme southwestern Wyoming to the isolated ranges of the Colorado Plateau in southern Utah. The ecoregion includes the Wasatch Range, a major north-south range; and the Unitas, one of a very few major North American east-west ranges. This ecoregion is within the Nearctic Realm and is an element of the Temperate Coniferous Forests biome. The dominant vegetation of the ecoregion is coniferous forests of varying composition. Ponderosa pine (Pinus ponderosa), Douglas-fir (Psuedotsuga menziesii), and Subalpine fir (Abies lasiocarpa), and Englemann spruce (Picea engelmanni) communities all exist in these mountains in various associations. Limber pine (Pinus flexilis) also occurs... More »
Eastern Cascades forests Last Updated on 2015-01-19 22:30:17 WWF Terrestrial Ecoregions Collection The Eastern Cascades forests span the eastern slopes of the Cascade Mountains in Oregon and Washington, from the southern reaches of the Cascade Mountains Leeward Forests to northern California. Vegetation is highly variable throughout this ecoregion, being influenced chiefly by edaphic processes and disturbance regimes. Several ecotones exist, particularly along the Cascade crest where western Cascade forest types overlap with eastern Cascade forests (e.g., the Wenatchee National Forest in Washington has conifer species present on both sides of the Cascades) and along the lower timberline, where forest species mix with shrub and shrub-steppe communities. This ecoregion is considered part of the Nearctic Realm, and is given the ecocode NA0512 by the World Wildlife Fund; it is within the Temperate Coniferous... More »
Alberta Mountain forests Last Updated on 2015-01-16 14:48:16 WWF Terrestrial Ecoregions Collection The Alberta Mountain forests ecoregion lies entirely within Canada and almost fully within the province of Alberta, but hugs the Alberta-British Columbia border from Banff northward to Jasper and Kakwa. The ecoregion is classified within the Temperate Coniferous Forests biome. Mean annual temperature in the Eastern Continental Ranges is 2.5°C, mean summer temperature is 12°C and mean winter temperature is -7.5°C. Precipitation increases from east to west and also with elevation, from 600-800 millimetres (mm) per year. Valley regions are marked by warm, dry summers and mild, snowy winters, and subalpine areas have cool, showery summers and cold, snowy winters. This region covers the Rocky Mountains of Alberta, incorporating the eastern flanks of the Continental Ranges. The major peaks cluster... More »
Snake-Columbia shrub steppe Last Updated on 2015-01-14 18:54:29 WWF Terrestrial Ecoregions Collection   The Snake-Columbia shrub steppe is a vast, mostly arid ecoregion. Its easternmost limit is the Continental Divide in eastern Idaho. From there, the ecoregion follows the arc of the Snake River Plain as far as Hell's Canyon. The ecoregion thence extends throughout southeastern Oregon, spreading along the Deschutes River catchmentCatchment is the entire area of a hydrological drainage basin. to the Columbia River. It also includes, following hydrographic lines, parts of northern Nevada and the extreme northeast of California. To the north, the ecoregion dominates the western portion of the Columbia Basin in Washington. The Snake-Columbia shrub steppe is within the Nearctic Realm. The ecoregion is largely in the rain shadow of the Cascade Mountains and thus receives little precipitation. Latitude... More »