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The performance of traditional biological indices used in river biomonitoring (a) is reduced by increasing flow intermittence (percentage) following different relationships (b) depending on spatial connectivity and species’ dispersal and resistance traits (c). Typically, an effective index classifies 80%–100% of sites correctly. See box 2 for a detailed description. The percentage of flow intermittence refers to the annual amount of time that the river has no flow.
