Abstract
Even as biotic indices, described in Chapter 13 , are able to provide a better assessment of the overall status of the water quality in conjunction with ‘physico-chemical’ water quality indices than the latter can achieve in isolation, the former aren’t always adequately representative. The reason is that biotic indices are based on the sensitivity to stress of only a few indicator species or ecological group of species. In contrast, indices of biological integrity (IBIs) use a combination of univariate and biotic indices in an endeavor to capture with greater sensitivity the impacts of anthropogenic disturbances on aquatic ecosystems. Due to the use of multiple sub-indices, IBIs are also commonly referred as multimetric indices .
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