The accurate characterization of water chemistry in wetlands and deepwater habitats is difficult, both because of problems in measurement and because values tend to vary with changes in the season, weather, time of day, and other factors. Yet, very subtle changes in water chemistry, which occur over short distances, may have a marked influence on the types of plants or animals that inhabit an area. A description of water chemistry, therefore, must be an essential part of this classification system. 


Two kinds of Water Chemistry Modifiers are employed in this classification: Salinity Modifiers and pH (hydrogen-ion) Modifiers. All habitats are classified according to salinity, and freshwater habitats are further classified by pH levels.



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