Answer to the question: Which organisms play key roles in improving water quality in aquatic ecosystems? Traditionally it is thought that the main role belongs to microorganisms. Is this really so?

Answer to the question:

Which organisms play key roles in improving water quality in aquatic ecosystems? 

Traditionally it is thought that the main role belongs to microorganisms. Is this really so? 

http://5bio5.blogspot.com/2014/01/aswer-to-question-which-organisms-play.html

See the question and answer(s) at:
https://www.researchgate.net/post/Which_organisms_play_key_roles_in_improving_water_quality_in_aquatic_ecosystems

Some papers (see the links) present a new answer to this question. These papers present
a new vision of how biodiversity helps towards better stability and water quality, in other words, how biodiversity is involved in the ecosystem services. In these papers, the fundamentals of a new conceptualization and synthetic theory of the multi-functional role of aquatic organisms in water self-purification, in improvement of water quality were formulated:
Key papers:
http://www.scribd.com/doc/60659939/;

http://www.scribd.com/doc/52627327/2H469p203-Polyfunctional-role-w-Addendum;

http://www.scribd.com/doc/48099028/;