In a series of some research papers of mine, previously underestimated role of aquatic biota (total community of aquatic organisms) in maintaining and improving water quality was identified. Moreover, my experiments showed that this useful function of the biota is vulnerable and can be damaged by chemical pollution. Do you agree with this conceptualization and interpretation of the role of the biota in aquatic ecosystem function? I added some selected papers of mine which contain the above-mentioned conceptualization.
Yes, biota plays a central role in self-purification, and as an indicator of water quality. There are many different biotic indices, see for example: https://www.sciencedirect.com/topics/earth-and-planetary-sciences/biotic-index The saprobic index is an old system: https://en.wikipedia.org/wiki/Saprobic_system https://www.sciencedirect.com/topics/earth-and-planetary-sciences/saprobic-index
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