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Revision as of 09:38, 18 November 2005 by EncycloPetey (talk | contribs) (stub sorting)(diff) ← Previous revision | Latest revision (diff) | Newer revision → (diff)Any biological species or group of species whose function, population, or status can be used to determine ecosystem level or environmental integrity. An example of such a group of organisms is copepods and other small water crustaceans present in many water bodies.
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