Answer:
reflect the conditions and changes of an environment where they live.
Explanation:
Effective indicator species need distinct environmental factors to sustain and survive in the environment. They reflect the conditions and changes of an environment where they live.
Fishes, specifically steelhead trouts, are an effective indicator species because steelhead trouts require distinct environmental conditions to survive such as temperature of the water, availability of food, specific waterbed, etc. If there is an absence of steelhead trouts in a particular body of water, scientists can easily determine that the water has environmental problems.
Steelhead trout serve as indicator species because they require certain optimum conditions to survive.
There are certain organisms that require certain specific conditions to survive. In the absence of those conditions, the organisms can not survive and reproduce. The absence of these species indicate the absence of conditions necessary for their survival.
The steelhead trout requires conditions such as; clean water, a defined temperature range, unsilted gravel etc. The absence of these conditions means the absence of the steelhead trout. The absence of fish species generally show that a water body is not conducive for aquatic life.
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