Record Display for the EPA National Library Catalog

RECORD NUMBER: 205 OF 724

OLS Field Name OLS Field Data
Main Title Correspondence between Ecoregions and Spatial Patterns in Stream Ecosystems in Oregon.
Author Whittier, T. R. ; Hughes, R. M. ; Larsen, D. P. ;
CORP Author Northrop Services, Inc., Corvallis, OR.;Corvallis Environmental Research Lab., OR.
Publisher c1988
Year Published 1988
Report Number EPA-68-03-3124; EPA/600/J-88/425;
Stock Number PB90-108234
Additional Subjects Oregon ; Streams ; Classifying ; Watersheds ; Fishes ; Invertebrates ; Water quality ; Reprints ; Aquatic ecosystems ; Habitats
Holdings
Library Call Number Additional Info Location Last
Modified
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Status
NTIS  PB90-108234 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 03/10/1990
Collation 18p
Abstract
Multivariate analyses of biotic assemblages and physiochemical measures, species richness, diversity, and composition were used to evaluate the robustness of Omernik's ecoregion classification for small streams in the eight ecoregions of Oregon. Clearest differences were between the montane and nonmontane regions. For the three nonmontane regions, ordinations of fishes, macroinvertebrates, water quality, and physical habitat measures show the clearest differences, with the Willamette Valley ecoregion being consistently most unlike all other regions. Differences between the Columbia Basin and High Desert regions were clearest for water quality and physical habitat measures and fish assemblages of the montane regions, the East Cascade Slopes showed the greatest variability, as shown by the ranges of ordination scores for fishes, water quality, and physical habitat. Regional patterns in periphyton assemblages were markedly different from the patterns in the other groups of variables. Ecoregions can be used as a broad-scale geographic framework for classifying streams. The framework provides managers of lotic resources a useful alternative to river basins.