U.S. DEPARTMENT OF THE INTERIORBUREAU OF LAND MANAGEMENT
Most of the ecoregion is dominated by sagebrush steppe ecosystems on the desert floor, but distinct vegetation zones related to relief and elevation also exist. The desert floor is characterized by big sagebrush (Artemisia tridentata), low sagebrush (Artemisia arbuscula)-and salt-desert shrub systems. With increasing elevation, the higher plateaus and rocky areas support western juniper (Juniperus occidentalis) and curlleaf mountain mahogany (Cercocarpus ledifolius) communities. Aspen (Populus tremuloides) communities grow along streams and drainages in the mountain gorges and riparian zones, providing an important source of forage for deer and other wildlife. Isolated stands of Douglas-fir (Pseudotsuga menziesii) and whitebark pine (Pinus albicaulis) also occur in the mountains. The subalpine zone supports low-growing shrubs, grasses, and wildflowers such as mountain meadow knotweed (Polygonum bistortoides) and false hellebore (Veratrum viride).
Terrestrial wildlife species of concern include bighorn sheep ( Ovis canadensis ), mule deer (Odocoileus hemionus), elk (Cervus elaphus), pronghorn (Antilocapra americana), pygmy rabbit (Brachylagus idahoensis), snowshoe hare (Lepus americanus), golden eagle (Aquila chrysaetos), and greater sage-grouse (Centrocercus urophasianus). Important habitats in the ecoregion include migration corridors and areas for overwintering pronghorn, as well as seasonal habitats for greater sage-grouse. The Northern Basin and Range ecoregion also supports thousands of migratory waterfowl in the Malheur Lake area, and populations of the Lahontan cutthroat trout (Oncorhynchus clarkii henshawi), redband trout (Oncorhynchus mykiss), bull trout (Salvelinus confluentus), warm water fish, bat species, and spotted frog (Rana luteiventris).
These management questions were organized into three tiers, based on the complexity of the question:
During the REA process, 12 management questions were eliminated due to lack of available data, or because the assessment management team determined that an answer to the question could not be portrayed spatially.
In brief, the coarse-filter conservation elements for the NGB REA include sagebrush, salt desert shrub, juniper species, aspen, streams and rivers, springs and seeps, groundwater, and wetlands. Wild horses and burros and specially designated areas were also treated as coarse-filter conservation elements in the NGB REA because they occur within discrete polygons on the landscape.
Examples of fine-filter conservation elements include mule deer, greater sage grouse, golden eagle, pygmy rabbit, bighorn sheep, and bats. The primary criterion for selecting fine-filter conservation elements was that they should be native species of regional management concern.
This REA exthe potential effects of the following change agents. A more complete discussion of change agents is presented in the Task 1 Final Memorandum.
Data, Maps, and Models
Memos and Reports