character displacement

Character displacement is a biological process where competing species evolve differences in traits that reduce competition. This occurs when two species with similar resource needs coexist. Natural selection favors individuals in each species that utilize resources differently, minimizing direct competition.

For example, Darwin's finches on the Galapagos Islands evolved distinct beak sizes and shapes due to competition for food. This divergence allows them to coexist by exploiting different food sources. Similarly, studies on seed-feeding rodents in North American deserts show they have evolved differences in size and other characteristics to reduce competition. This process, driven by natural selection, helps species fill different ecological niches within a community.1