Answer :
An indicator species can be defined as a species whose relative abundance is indicative of specific environmental conditions. The steelhead trout represents an indicator species that indicate water quality.
- Indicator species can be used to diagnose a determined environmental condition, which is useful to examine the health of a given ecosystem (e.g., greasewood indicates saline soils).
- The steelhead trout, also known as salmon trout and sea-run rainbow trout, is an indicator species for water quality.
- This species is highly sensitive to environmental alterations (e.g., pollution), thereby providing a warning sign of habitat deterioration.
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