The applicability of EMAP'S Western Pilot to state and regional questions of fish assemblage structure.
Lomnicky, Gregg1, Hughes, Robert*,1, Whittier, Thom1, Peck, David2, 1 Dynamac Inc., Corvallis, OR2 Western Ecology Division, NHEERL. ORD, US Environmental Protection Agency, Corvallis, OR
ABSTRACT- What percentage of the West's 209,381 kilometers of streams and rivers contain fish? What proportion contains only native fish? Do aliens dominate the fish fauna of streams in any region or state? What are the ranges and relative densities of the most common fish, native and alien, in streams and rivers across the West? Which reproductive strategy or feeding guild is most common, and what percentage of stream length has been unsampleable due to permit and access restrictions? The EPA Environmental Monitoring and Assessment Program's Western Pilot (2000-2004), which is based upon a probabilistic design, provides an opportunity to make inferences and answer these and other research and management questions. Reported data incorporates information from 515 site visits in 12 western states and three level-two ecoregions (Western Forest, Plains, Xeric) sampled during 2000-2001. Sixteen percent of the west's stream and river stream length is unrepresented due to permit and access restrictions.
Key words: EMAP, fish, biodiversity, probability survey
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