That portion of its potential (fundamental) niche occupied by a species when competitors or predators are present.

Set of resources and physical habitats actually used by individuals of a species in an area (a subset of the Fundamental Niche)

re-a-lized neesh The resources in a species' environment that it can actually use, considering competition and other limitations. 838

The actual niche occupied by an organism; it differs from the fundamental niche because of the presence of other species.

parts of the fundamental niche of a species that are actually used by that species. See ecological niche, fundamental niche.