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63:. The species found at the reference sites collectively make up the species assemblage for that site and are the basis for a statistical comparison between reference sites and non-reference sites. The comparison between the expected species and the observed species can then be used to estimate this aspect of the ecological health of a river.
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Reference sites can be chosen and adjusted several ways. Usually they represent the best conditions within the region or area under study, and are a short stretch of river. Sometimes the reference site expectations are adjusted for degradation of the entire region by human impact. 'Pristine'
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was first derived in 1977. Since then it has been developed and updated with addition of a wider range of freshwater sites. It has been adapted into various other versions around the world, including a
Canadian version known as CABIN, AUSRIVAS in Australia, MEDPACS in
59:, low dissolved oxygen, and other stressors, but others are sensitive; organisms vary in their tolerances. Therefore, different species will usually be found, in different proportions, at different river sites of varying quality. Some organisms are especially good
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Manuel, Poquet, José; Javier, Alba-Tercedor; Tura, Puntí; Maria, del Mar Sánchez-Montoya; Santiago, Robles; Maruxa, Álvarez; Carmen, Zamora-Muñoz; Elisa, Sáinz-Cantero, Carmen; Rosario, Vidal-Abarca, Maria (2009).
286:"MEDiterranean Prediction And Classification System (MEDPACS): an implementation of the RIVPACS/AUSRIVAS predictive approach for assessing Mediterranean aquatic macroinvertebrate communities"
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Assessing the biological quality of fresh waters: RIVPACS and other techniques
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This classification of freshwater sites based on the macroinvertebrate
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Canada, Government of Canada, Environment and
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as its official tool for macroinvertebrate classification
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John F. Wright, David W. Sutcliffe and Mike T. Furse.
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222:"Canadian aquatic biomonitoring network - CABIN"
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173:References
80:freshwater
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39:, worms,
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