Further indices consider the distinct behavior of different taxonomic groups under environmental stress situations, for example, the nematodes/copepods index. Some authors have criticized these indices because of their dependence on parameters such as water depth and sediment particle size and also because of their unpredictable pattern of variation depending on the type of pollution. More recently, indices for example the polychaetes/ amphipods ratio or the index of r/K strategists, which consider all the benthic taxa, were developed.
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