Redband_Trout
These data describe areas of suitable habitat believed to be used currently and historically by redband trout populations. Columbia River redband trout, Oncorhynchus mykiss gairdneri, a subspecies of rainbow trout, Oncorhynchus mykiss, is native to the Fraser and Columbia River drainages, east of the Cascade Mountains to barrier falls on the Pend Oreille, Spokane, Snake and Kootenai rivers (Allendorf et al. 1980; Behnke 1992). Northern Great Basin redband trout, Oncorhynchus mykiss newberrii, are found in the closed basins of south-central Oregon as well as the Upper Klamath Lake basin. While Upper Klamath Lake now drains to the ocean, redband trout in the basin had ancestors that came from interior connections to the Great Basin and not from connections to the ocean (Behnke 1992).Redband trout, for the purposes of habitat distribution mapping, are generally defined as stream-resident O. mykiss gairdneri; migration is confined within their natal stream or watershed while steelhead, or the anadromous life form of O.mykiss gairdneri, migrate from their natal stream to the ocean and back. It is recognized, that while redband and steelhead habitat distribution datasets are published separately, overlapping areas represent the same subspecies.The term "currently" is defined as within the past five reproductive cycles. This information is based on sampling, the best professional opinion of Oregon Dept. of Fish and Wildlife or other natural resources agency staff biologists or modeling (see the fhdBasis field). Due to natural variations in run size, water conditions, or other environmental factors, some habitats identified may not be used annually.These data now comply with the Oregon Fish Habitat Distribution Data Standard that was adopted by the Oregon Geographic Information Council in February 2011. The Standard document can be found at: http://gis.oregon.gov/DAS/EISPD/GEO/standards/docs/OregonFishHabitatDistributionDataStandardv2.pdf Key features of the Oregon Fish Habitat Distribution Data include: species, run, life history, habitat use, origin, production, the basis for each record, originator name, originator entity and reference. Habitat distribution data are mapped at a 1:24,000 scale statewide and are based on the Pacific Northwest Framework Hydrography dataset. The data are made available as GIS files in both shapefile and ESRI geodatabase format. The data were developed over an extensive time period ranging from 1996 to 2011.
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