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Theodore Roosevelt National Park

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The objectives of this study, initiated in May, 1978, were to study and delimit the habitat types of Theodore Roosevelt National Memorial Park (TRNMP), North Dakota, to collect and tabulate the vascular plants, to determine the edaphic characteristics of the habitat types, and to collect animal species of the habitat types. There have been few studies of habitat types in grassland areas; this one is the first in western North Dakota. The habitat type concept was developed to assess the ecologic status of forest vegetation of the Northern Rocky Mountains (Daubenmire 1952, Daubenmire and Daubenmire 1968). Later Daubenmire (1970) used the same concepts in an analysis of steppe vegetation of eastern Washington. This basic ecologic concept has been used since in a number of studies throughout the Rocky Mountain region (Pfister et al. 1977, Reed 1971, 1976, Wirsing and Alexander 1975, Hoffman and Alexander 1976). The basic nature of this ecologic concept permits wide usage in vegetation studies. Additionally, following the basic habitat type delimitation, follow-up studies can relate the habitat types to other aspects of the biotic community. Examples include studies on primary productivity, disease susceptibility of tree species, potential for wildlife, soil moisture regimes, small mammal distributions (Daubenmire 1973, Hoffman 1960, Layser 1974, Mackee 1970, Rickard 1960).