http://en.wikipedia.org/wiki/Lotic_system_ecology
Water chemistry between systems varies tremendously. The chemistry is foremost determined by inputs from the geology of its watershed, or catchment area, but can also be influenced by precipitation and the addition of pollutants from human sources.Large differences in chemistry do not usually exist within small lotic systems due to a high rate of mixing.
In larger river systems, however, the concentrations of most nutrients, dissolved salts, and pH decrease as distance increases from the river’s source.
Water chemistry between systems varies tremendously. The chemistry is foremost determined by inputs from the geology of its watershed, or catchment area, but can also be influenced by precipitation and the addition of pollutants from human sources.Large differences in chemistry do not usually exist within small lotic systems due to a high rate of mixing.
In larger river systems, however, the concentrations of most nutrients, dissolved salts, and pH decrease as distance increases from the river’s source.
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