University of Nebraska - Lincoln DigitalCommons@University of Nebraska - Lincoln USGS Staff -- Published Research US Geological Survey 2004 Great Plains Ecosystems: Past, Present, and Future Fred B. Samson United States Forest Service Fritz L. Knopf United States Geological Survey Biological Resources Division Wayne Ostlie The Nature Conservancy,
[email protected] Follow this and additional works at: https://digitalcommons.unl.edu/usgsstaffpub Part of the Earth Sciences Commons Samson, Fred B.; Knopf, Fritz L.; and Ostlie, Wayne, "Great Plains Ecosystems: Past, Present, and Future" (2004). USGS Staff -- Published Research. 45. https://digitalcommons.unl.edu/usgsstaffpub/45 This Article is brought to you for free and open access by the US Geological Survey at DigitalCommons@University of Nebraska - Lincoln. It has been accepted for inclusion in USGS Staff -- Published Research by an authorized administrator of DigitalCommons@University of Nebraska - Lincoln. Great Plains Ecosystems: Past, Present, and Future Fred B. Samson, Fritz L. Knopf, & Wayne R. Ostlie 6 SPECIALCOVERAGE ...eat Plains ecosystems: _ _ t, present, and future HH[[~dIed B. Samson, Fritz L. Knopf, and e R. Ostlie sts that the main bodies of North American prairie (i.e., the tall- grass, mixed, and shortgrass) are among the most endangered resources on the con- tinent. The purpose of this paper is to provide a past and present biological base- line by which to understand North American prairies and to provide a platform for future conservation. Events both immediate to the end of the Pleistocene and his- toric suggest that the present grassland conditions are different from those within which most of the grassland organisms evolved.