Northern mixed grasslands

Northern mixed grasslands
Northern mixed grasslands (area 46 on the map)
Ecology
Ecozone	Nearctic
Biome	Temperate grasslands, savannas, and shrublands
Borders	Western High Plains to the northwest Lake Agassiz Plain to the northeast Western Corn Belt Plains to the southeast North Central Hardwood Forests a small portion to the east Northwestern Glaciated Plains to the west
Bird species	?^[1]
Mammal species	?^[1]
Geography
Country	United States, Canada
States/Provinces	North Dakota, South Dakota, Minnesota, Saskatchewan, Manitoba
Conservation
Habitat loss	75%^[1]
Protected	Very low%^[1]

The Northern Mixed Grasslands^[2] is one of 867 terrestrial ecoregions defined by the World Wide Fund for Nature. This ecoregion includes parts of the Canadian provinces of Saskatchewan and Manitoba, north-central and eastern (except extreme eastern) North Dakota, most of east South Dakota, and small portions of western Minnesota in the American Great Plains. The United States Environmental Protection Agency (EPA) defines this ecoregion as the Northern Glaciated Plains.^[3]

Setting

This is a transition zone between the ecoregions of the Northern tall grasslands to the east and the Northern short grasslands to the west, while to the north lie the cooler Canadian boreal forests and a much shorter growing season.^[2]

Environment

Flora

The Mixed Grass prairie was recognized as a mixture of the tallgrass and shortgrass prairies. The dominant grasses found here include grama (Bouteloua gracilis), little bluestem (Schizachyrium scoparium), needle-and-thread grass (Stipa comata), wheatgrass (Agropyron smithii), Carex filifolia, junegrass (Koeleria cristata), and Poa secunda.^[2]

Further north in the ecoregion, the transitional grassland ecoclimate supports a vegetation of quaking aspen (Populus tremuloides), bur oak (Quercus macrocarpa) groves, mixed tall shrubs, and intermittent fescue grasslands. Generally, quaking aspen and shrubs occur on moist sites while bur oak and grass species occur on increasingly drier sites. The southeast portion of the ecoregion tends to be warmer and drier. Remaining native vegetation in this portion of the ecoregion is dominated by spear grass and wheat grass. In addition, local saline deposits support alkali grass, wild barley, red samphire, and seablite. In the separated Cypress Upland, fescue and wheatgrass grow below 1000 m, and mixed montane forests of lodgepole pine, deciduous trees and shrubs grow at higher elevations. Larkspur (Delphinium sp.), death camas (Zigadenus elegans), and wild lupine (Lupinus sp.) are found here and nowhere else in the prairies.^[2]

Fauna

The topography is broken by many glacial pothole lakes, making this ecoregion the most productive breeding area for waterfowl in the U.S. Other wildlife characteristic of the moist mixed grassland are black-tailed and white-tailed deer (Odocoileus hemionus and O. virginianus), pronghorn antelope (Antilocapra americana), coyote (Canis latrans), short-horned lizard (Phrynosoma douglassi), western rattlesnake (Crotalus viridis), rabbit (Sylvilagus sp.) and sage grouse (Centrocercus urophasianus). Yellow-rumped warbler (Dendroica coronata) is also found only in this part of the prairies. Bison were once a common feature of this ecoregion.^[2]

Threats and preservation

The ecoregion provides significant waterfowl production for the continent and is a major staging area. It is estimated that up to 80 percent of the wetlands, however, have been lost or degraded. The Cypress Uplands (Alberta/Saskatchewan), which are believed to have escaped the last glaciation, are located in this ecoregion.^[2]

No completely intact blocks of habitat remain. Restoration of some areas is just beginning. Few sites are protected.^[2]

References

↑ 1.0 1.1 1.2 1.3 Hoekstra, J. M.; Molnar, J. L.; Jennings, M.; Revenga, C.; Spalding, M. D.; Boucher, T. M.; Robertson, J. C.; Heibel, T. J.; Ellison, K. (2010). Molnar, J. L., ed. The Atlas of Global Conservation: Changes, Challenges, and Opportunities to Make a Difference. University of California Press. ISBN 978-0-520-26256-0.
↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 World Wildlife Fund (2001). "Northern mixed grasslands". WildWorld Ecoregion Profile. National Geographic Society. Archived from the original on 2010-03-08.
↑ "Level III ecoregions in the contiguous United States". Area 46 on the map: US EPA.

External links