The Reference Condition Approach (RCA) is gaining wide acceptance as an innovative and cost effective tool for water quality monitoring and site testing in British Columbia. A multivariate model is used to explain variability of benthic invertebrate communities among reference sites using environmental attributes at those sites. The model is used to predict what biota should be present at a "test" site if it is in a reference condition. If the biota found at the test site is different from that predicted to be present, the site is rated as being stressed to varying degrees.
Perrin, Chris J., Limnotek Research and Development Inc.. 2006. Application of Multivariate Techniques to Examine Quality of Streams in the Okanagan Region. Ministry of Environment
Keywords: Reference Condition Approach, RCA, water quality monitoring, site testing
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