. Southeast Montana wetland assessment : developing and refining Montana's wetland assessment and monitoring strategy. Wetlands; Wetland ecology. Reservoir is the largest reservoir in the study area. Many smaller reservoirs occur throughout the study Figure 4. Relative effective annual precipitation (REAP) for the southeast Montana basin-wide assessment project area. Ecoregions and Vegetation The study area lies entirely within the Northwestern Great Plains Level III ecoregion (Omernik 1987). Level IV ecoregions further subdivide the area into 10 different units based on geology and
. Southeast Montana wetland assessment : developing and refining Montana's wetland assessment and monitoring strategy. Wetlands; Wetland ecology. Reservoir is the largest reservoir in the study area. Many smaller reservoirs occur throughout the study Figure 4. Relative effective annual precipitation (REAP) for the southeast Montana basin-wide assessment project area. Ecoregions and Vegetation The study area lies entirely within the Northwestern Great Plains Level III ecoregion (Omernik 1987). Level IV ecoregions further subdivide the area into 10 different units based on geology and dominant vegetation (Figure 5; Table 2). Vegetation is predominantly grasslands and sagebrush steppe (Figure 6). Grasslands of the study area are composed of wheatgrass (Pascopyrum/Elymus) - needlegrass (Nasella/Hesperostipa) or grama (Bouteloua) - needlegrass (Nasella/Hesperostipa) - wheatgrass (Pascopyrum/Elymus) vegetation associations. Buttes support Ponderosa pine (Pinus ponderosa) woodlands with wooded draws dominated by green ash (Fraxinus pennsylvanica) and boxelder (Acer negundo). Areas of sagebrush steppe dominated by Wyoming big sagebrush (Artemisia tridentata spp. wyomingensis) and Gardner's saltbush (Atriplex gardneri) occur in the southeastern portion of the study area. River breaks occur in the northern portion of the study area with Rocky Mountain juniper (Juniperus scopulorum) and green ash and boxelder on the north-facing slopes of draws. 5. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Newlon, Karen Rachel,author; Ramstead, Karissa M. ,author; Hahn, Jamul,author; United States. Environmental Protection Agency,addressee; Montana Natural Heritage Program. Helena, MT : Montana Natural Heritage Program
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