Definition of Character Displacement
Character displacement is an evolutionary change that has occurred due to the presence of two similar species in the same environment. When this happens, natural selection favors the divergence in the characters. The divergence takes place in the form and structure, ecology, behavior, and physiology of the organisms.
Due to the divergence in the traits, it becomes possible to distinguish the two coexisting species from each other. In the absence of a similar species, it becomes feasible for one species to expand its niche in order to absorb the resources, and the constraints of the competitive pressure imposed by the other species are also released.