Ecological categorization of aquatic organisms

Taxonomic classification alone is not sufRciently realistic for describing the communities living in a certain environment. A better picture of the character of their habitat is provided by categorization based on some of the ecological aspects. The following criteria are commonly used  

Russel, E. W. Soil Conditions and Plant Growth, 7th ed. Longmans Green, London 

Berkeley, W. C. R. and Campbell, R. In Microorganisms Function, Form and Environment. E. Hawker and H.A. Linton (eds). E. Arnold, London 1971. 

and Morgen, J. I. Aquatic Chemistry. J. Wiley and Sons, New York 1970. 

and Hunter, J. V. Principles and Applications of Water Chemistry. 

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