Download Ecology and Conservation of Great Plains Vertebrates by Mary Ann Vinton, Scott L. Collins (auth.), Fritz L. Knopf, PDF

By Mary Ann Vinton, Scott L. Collins (auth.), Fritz L. Knopf, Fred B. Samson (eds.)

The frontier pictures of the USA embody unending horizons, majestic herds of local ungulates, and romanticized life-styles of nomadie peoples. the photographs have been mere reflections of vertebrates residing in concord in an surroundings pushed by means of the unpre­ dictable neighborhood and nearby results of drought, frre, and grazing. these results, sometimes called ecological "disturbanees," are relatively the riding forces on which species depended to create the spatial and temporal heterogeneity that favourite ecological necessities for survival. Alandscape seen by means of ecu descendants as monotony interrupted purely by way of extremes in climate and in most cases known as the "Great American Desert," this state was once to be rushed via and cursed, a barrier that hindered entry to the deep soils of the Oregon kingdom, the wealthy minerals of California and Colorado, and the non secular freedom sought in Utah. those that stayed (for loss of assets or stamina) spent a century attempting to reasonable the ecological dynamics of serious Plains prairies by way of suppressing fires, planting timber and unique grasses, poisoning rodents, diverting waters, and homogenizing the dynamies of grazing with unending fences-all growing certain­ an another way boundless vista. aries in traditionally, tourists and settlers mentioned the world of tallgrasses alongside the western fringe of the deciduous wooded area and increasing halfway throughout Kansas because the "True Prairie. " The grasses thlnned and have become shorter to the west, a space recognized then because the nice Plains.

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Extra resources for Ecology and Conservation of Great Plains Vertebrates

Sample text

Loeal wetland mosaics with varying hydrology and vegetation types have been disrupted, and the potential to support diverse assemblages of vertebrates has been jeopardized. In addition to development of monotypic vegetation on a loeal seale, many hydrologie modifieations have eaused shifts in the timing, duration, and frequeney of flooding. These modifieations reduee habitat values and deerease the quality and availability of wetlands for vertebrate aetivities. Plant Communities Native Vegetation In general, interior freshwater wetlands are dominated by grasses, sedges, and other emergent hydrophytes (Kantrud et al.

Wetlands also serve as a source of free water 2. 6 km2 if undisturbed (Jones et al. 1983). Most avian species associated with wetlands are continentally mobile, but a few regionally mobile birds, such as the ring-necked pheasant (Phasianus colchicus), regularly exploit wetlands. Conversion of the prairie to agriculture, although providing an important food source for pheasants, has destroyed native upland cover. During dry years, vegetation in palustrine wetlands throughout the Plains provides cover that supports high pheasant densities.

The hydrology of wetlands in the pothole region is largely deterrnined by local precipitation. In general, aquatic habitats in the northem Great Plains are small «8 ha) and tend to develop in snowmelt and rainwater catch basins or shallow depressions where groundwater reaches the surface (Stewart and Kantrud 1972). Most potholes are considered fresh, but saline and alkaline wetlands commonly occur in the western portion of the northem Great Plains. Of the potholes that still remain, tilled basins are most numerous, followed by untilled ephemeral and temporary wetlands (pederson et al.

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