A species of cattail inhabits both deep and shallow water in the absence of a competitor but only shallow water in the presence of it.This is an example of

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Quizplus · Accepted Answer

This is an example of a realized niche. The species is capable of inhabiting both deep and shallow water, which would be its fundamental niche, but in the presence of a competitor, it is only found in shallow water. This means that its actual, realized niche is restricted to shallower water.

A Species of Cattail Inhabits Both Deep and Shallow Water