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Unformatted text preview: niche overlap of a scarce resource for which they compete. Competitive exclusion occurs between two species when competition is so intense that one species completely eliminates the second species from an area. In nature this is rather rare. While owls and foxes may compete for a common food source, there are alternate sources of food available. Niche overlap is said to be minimal. Paramecium aurelia has a population nearly twice as large when it does not have to share its food source with a competing species. Competitive release occurs when the competing species is no longer present and its constraint on the winner's population size is removed....
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- Fall '10