| Western short grasslands | |
|---|---|
 Canyon in the shortgrass prairie of Buffalo Lake National Wildlife Refuge | |
 | |
| Ecology | |
| Realm | Nearctic |
| Biome | Temperate grasslands, savannas, and shrublands |
| Borders | |
| Bird species | 245 [1] |
| Mammal species | 107 [1] |
| Geography | |
| Area | 435,200 km2 (168,000 sq mi) |
| Country | United States |
| States | |
| Climate type | Cold semi-arid |
| Conservation | |
| Habitat loss | 30.5% [1] |
| Protected | 5% [1] |
The Western short grasslands is a temperate grassland ecoregion of the United States.
This ecoregion largely corresponds with the geographical region known as the High Plains. It is located in eastern, northern, and central Montana, eastern Wyoming, western Nebraska (the Nebraska Panhandle), eastern Colorado, western Kansas, western Oklahoma (the Oklahoma Panhandle), eastern New Mexico, the Texas Panhandle and parts of west-central Texas and a very small portion of southwestern South Dakota. The Western short grasslands are characterised by a semi-arid climate, with low precipitation, warm temperatures, and a long growing season relative to other Nearctic prairie ecoregions. [2] [3]
The two dominant grasses of this ecoregion are blue grama (Bouteloua gracilis) and buffalograss ( Bouteloua dactyloides ).
Mammals of this ecoregion include bison (Bison bison bison), mule deer (Odocoileus hemonius) and coyote (Canis latrans). Birds include the Lesser Prairie Chicken, greater prairie chicken, dickcissel and loggerhead shrike. This ecoregion is home to a very diverse assortment of butterflies, birds, and mammals, due in part to its proximity to the subtropics. [4]
Most of this ecoregion is occupied by farms and ranches, and cattle grazing has affected 75% of the Western short grasslands, particularly the southern portion. This overgrazing has led to an invasion of desert scrub plants from the southwest, such as mesquite. Despite this, 40% of the ecoregion is considered to be intact. Protected areas include Buffalo Lake National Wildlife Refuge, in the panhandle region of Texas, Cimarron National Grassland in southwestern Kansas, Rocky Mountain Arsenal National Wildlife Refuge in central Colorado and Pawnee National Grassland in northeastern/north-central Colorado.
The Great Plains, sometimes simply "the Plains", is a broad expanse of flatland in North America. It is located just to the east of the Rocky Mountains, much of it covered in prairie, steppe, and grassland. It is the western part of the Interior Plains, which also include the mixed grass prairie, the tallgrass prairie between the Great Lakes and Appalachian Plateau, and the Taiga Plains and Boreal Plains ecozones in Northern Canada. Great Plains or Western Plains is also used to describe the ecoregion of the Great Plains, or alternatively the western portion of the Great Plains.
The Chihuahuan Desert is a desert ecoregion designation covering parts of northern Mexico and the southwestern United States. It occupies much of far West Texas, the middle to lower Rio Grande Valley and the lower Pecos Valley in New Mexico, and a portion of southeastern Arizona, as well as the central and northern portions of the Mexican Plateau. It is bordered on the west by the Sonoran Desert, the Colorado Plateau, and the extensive Sierra Madre Occidental range, along with northwestern lowlands of the Sierra Madre Oriental range. Its largest, continual expanse is located in Mexico, covering a large portion of the state of Chihuahua, along with portions of Coahuila, north-eastern Durango, the extreme northern part of Zacatecas, and small western portions of Nuevo León. With an area of about 501,896 km2 (193,783 sq mi), it is the largest desert in North America. The desert is fairly young, existing for only 8000 years.
The tallgrass prairie is an ecosystem native to central North America. Historically, natural and anthropogenic fire, as well as grazing by large mammals provided periodic disturbances to these ecosystems, limiting the encroachment of trees, recycling soil nutrients, and facilitating seed dispersal and germination. Prior to widespread use of the steel plow, which enabled large scale conversion to agricultural land use, tallgrass prairies extended throughout the American Midwest and smaller portions of southern central Canada, from the transitional ecotones out of eastern North American forests, west to a climatic threshold based on precipitation and soils, to the southern reaches of the Flint Hills in Oklahoma, to a transition into forest in Manitoba.
The Sandhills, often written Sand Hills, is a region of mixed-grass prairie on grass-stabilized sand dunes in north-central Nebraska, covering just over one quarter of the state. The dunes were designated a National Natural Landmark in 1984.
The Texas Blackland Prairies are a temperate grassland ecoregion located in Texas that runs roughly 300 miles (480 km) from the Red River in North Texas to San Antonio in the south. The prairie was named after its rich, dark soil. Less than 1% of the original Blackland prairie vegetation remains, scattered across Texas in parcels.
The Western Gulf coastal grasslands are a subtropical grassland ecoregion of the southern United States and northeastern Mexico. It is known in Louisiana as the "Cajun Prairie", Texas as "Coastal Prairie," and as the Tamaulipan pastizal in Mexico.
The shortgrass prairie is an ecosystem located in the Great Plains of North America. The two most dominant grasses in the shortgrass prairie are blue grama and buffalograss, the two less dominant grasses in the prairie are greasegrass and sideoats grama. The prairie was formerly maintained by grazing pressure of American bison, which is the keystone species. Due to its semiarid climate, the shortgrass prairie receives on average less precipitation than that of the tall and mixed grass prairies to the east.
The Western Himalayan alpine shrub and meadows is a montane grasslands and shrublands ecoregion of Nepal, India, and Tibet, which lies between the tree line and snow line in the western portion of the Himalaya Range.
The Geography of Oklahoma encompasses terrain and ecosystems ranging from arid plains to subtropical forests and mountains. Oklahoma contains 10 distinct ecological regions, more per square mile than in any other state by a wide margin. It is situated in the Great Plains and U.S. Interior Highlands region near the geographical center of the 48 contiguous states. Usually considered part of the South Central United States, Oklahoma is bounded on the east by Arkansas and Missouri, on the north by Kansas, on the northwest by Colorado, on the far west by New Mexico, and on the south and near-west by Texas.
The Northern short grasslands includes parts of the Canadian provinces of Alberta and Saskatchewan, and the American Great Plains states of Montana, North Dakota, Wyoming, South Dakota and Nebraska. One of 867 terrestrial ecoregions defined by the World Wide Fund for Nature, the United States Environmental Protection Agency (EPA) further breaks this ecoregion into the Northwestern Glaciated Plains and Northwestern Great Plains.
The East Central Texas forests or East Central Texas Plains (33) is a small temperate broadleaf and mixed forests ecoregion almost entirely within the state of Texas, United States. The northern forests perimeter is partially within the southeast Oklahoma border.
The Wyoming Basin shrub steppe ecoregion, within the deserts and xeric shrublands biome, is a shrub steppe in the northwestern United States.
The Colorado Rockies forests is a temperate coniferous forest ecoregion of the United States.
The central forest–grasslands transition is a prairie ecoregion of the central United States, an ecotone between eastern forests and the North American Great Plains. It is a classification defined by the World Wildlife Fund.
The Central tall grasslands are a prairie ecoregion of the Midwestern United States, part of the North American Great Plains.
The Montana valley and foothill grasslands are an ecoregion of northwestern North America in the northern United States and southern Canada.
The ecology of the Great Plains is diverse, largely owing to their great size. Differences in rainfall, elevation, and latitude create a variety of habitats including short grass, mixed grass, and tall-grass prairies, and riparian ecosystems.
The Central Great Plains are a semiarid prairie ecoregion of the central United States, part of North American Great Plains. The region runs from west-central Texas through west-central Oklahoma, central Kansas, and south-central Nebraska.
The southwestern tablelands comprise an ecoregion running from east-central to south-east Colorado, east-central and a small portion of eastern New Mexico, some eastern portions of the Oklahoma Panhandle, far south-central Kansas, and portions of northwest Texas. This ecoregion has a "cold semiarid" climate. Some years, a National Weather Service dust storm warning is issued in parts of Texas due to a dust storm originating from the lower part of the Southwestern Tablelands ecological region or from the southern end of the Western High Plains ecological region.
The Northern Mixed Grasslands is one of 867 terrestrial ecoregions defined by the World Wide Fund for Nature. This ecoregion includes parts of the Canadian provinces of Alberta, Saskatchewan, and Manitoba, north-central and eastern North Dakota, most of east South Dakota, and north-central Nebraska in the American Great Plains. The United States Environmental Protection Agency (EPA) defines this ecoregion as the Northern Glaciated Plains.