Biodiversity indicators: biological quality of surface water through the application of the aquatic biodiversity index (iba-bf) Acquatic biodiversity index The Biotic index strategy is based on the identification of macroinvertebrates, whose sensitivity towards water quality is well known; for this reason, they are defined as bioindicators. The community of benthic macroinvertebrates of a watercourse is, therefore, particularly suitable to be used in bioindication, as: 1) it is found in an environment with limited seasonal variations, 2) it is easy to sample, 3) it is abundant and generally always available.
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