Water Quality
Scientists determine the “health” of a freshwater habitat, such as a stream, by studying the organisms living in it.
The health of a habitat is determined by the biodiversity of the organisms living there. The water quality of a freshwater habitat is good when it is rich in oxygen and capable of supporting a variety of organisms. Water quality is fair when it contains less oxygen and low concentrations of pollutants. Poor water quality habitats have high levels of pollutants. Some organisms can only be found in healthy freshwater habitats with good water quality. Other organisms can tolerate fair water quality, but are unable to survive in poor water quality habitats. Some organisms are able to live just about anywhere.
Organisms indicative of water quality.
Healthy Habitat?
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