A Predictive (RIVPACS-Type) Model for Streams of the Western Allegheny Plateau

by North, Sheila H.

Abstract (Summary)
Predictive models such as the River InVertebrate Prediction And Classification System (RIVPACS) model the natural variation in macroinvertebrate communities across geographic regions by comparing observed (O) taxa to those expected (E) to occur in the absence of anthropogenic stress. Macroinvertebrates collected by Ohio EPA at 80 reference sites within the Western Allegheny Plateau Level III ecoregion between 1982 and 2005 were used to develop and validate a RIVPACS-type model for wadeable streams. Cluster analysis grouped the reference sites into seven groups based on biological similarity. Discriminant analysis correctly classified 78% of model reference sites using predictor variables. O/E ratios were normally distributed for all models, and standard deviation comparisons between discriminant and null models were similar regardless of the taxa occurrence frequency utilized for each model. Both models effectively detected stream degradation when applied to test sites.
Bibliographical Information:


School:Ohio University

School Location:USA - Ohio

Source Type:Master's Thesis

Keywords:rivpacs western allegheny plateau predictive model biomonitoring bioassessment macroinvertebrates ohio streams ecoregions wap discriminant analysis epa oepa


Date of Publication:01/01/2008

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