The Indicator species reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Indicator species

Indicator species are unique environmental indicators as they offer a signal of the biological condition in a watershed or ecosystem, and are a warning system that pollution has entered the food web.

The term indicator species is a bit misleading, as indicators are often whole groups or types of living beings.While indicator species is a term that is often used, it is somewhat inaccurate. Indicators are actually whole groups or flora/fauna types which can be used to assess environmental condition.

Most indicator species are fish, invertebrates, periphyton and macrophytes.

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