By Blair A. Csuti
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Additional resources for Atlas of Oregon wildlife: distribution, habitat, and natural history
First, the limits of distribution of a species are described in terms of predicted presence or absence in a geographic unit. Next, a habitat map, based on vegetation cover types and the species that occupy them, is created. Then each species is assigned to a set of habitat types. The final map represents all habitat types associated with a particular species within its distributional limits in Oregon. Cartography is the art and science of making maps. On maps, the real world is represented at reduced scale by lines, symbols, shadings, and other graphic conventions.
It is based on photo-interpretation of 1:250,000 LANDSAT Multispectral Scanner imagery. Most LANDSAT scenes were taken in summer 1988, although a few scenes from 1986 were used for a strip along the Oregon/Idaho border. S. Forest Service and Bureau of Land Management land cover maps were used to assist in labeling the state-wide vegetation map. A total of 133 vegetation cover types were identified. These vegetation types have been grouped into 30 habitat types according to their faunal similarity (O'Neil et al.
1990, Nussbaum 1969, Nussbaum and Clothier 1973. Page 7 Cascade Torrent Salamander (Rhyacotriton Cascadae) Order: Caudata Family: Dicamptodontidae State Status: Sensitive Federal Status: None Global Rank: G2G3 State Rank: S3 Length: 4 in (10 cm) Global Range: Coastal mountains from the Olympic Peninsula in Washington south to Mendocino County, California and in the Cascade Mountains of southern Washington and northern Oregon, with a local disjunct population in the southern Oregon Cascades. Habitat: The torrent salamander is most abundant in rocks bathed in a constant flow of cold water, also occurring in cool rocky streams, lakes, and seeps.