Ecological indicator

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Term Ecological indicator
Description Collective term for exposure, habitat response, and stressor indicators.
Definition Ecological indicator

Collective term for exposure, habitat response, and stressor inticators. Species (such as gladioli and lichens) that have particular requirements regarding soil, temprature,  rainfall, etc., and whose presence indicates that those requirements are being satisfied in that environment. A characteristic of the environment that, when measured, quantifies magnitude of stress, habitat characteristics, degree of exposure to a stressor, or ecological response to exposure. The term is a collective term for response, exposure, habitat, and stressor indicators.

References http://www.businessdictionary.com/definition/ecological-indicator.html
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