No because many genes have to work together to make make something change.
With less energy at higher trophic levels, there are usually fewer organisms as well. Organisms tend to be larger in size at higher trophic levels, but their smaller numbers result in less biomass. Biomass is the total mass of organisms at a trophic level.
Hope this helps! Please correct me if I'm wrong :)
Answer:
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The Pacific Salmon could be considered a keystone species because there are so many of them that they are like the main fish in the Pacific Coast area.