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Competitive exclusion principle

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In ecology, the competitive exclusion principle, sometimes referred to as Gause's law, is a proposition named for Georgy Gause that two species competing for the same limited resource cannot coexist at constant population values. When one species has even the slightest advantage over another, the one with the advantage will dominate in the long term. This leads either to the extinction of the weaker competitor or to an evolutionary or behavioral shift toward a different ecological niche. The principle has been paraphrased in the maxim "complete competitors can not coexist".

English Wikipedia http://en.wikipedia.org/wiki/Competitive_exclusion_principle

Spanish wikipedia http://es.wikipedia.org/wiki/Principio_de_exclusión_competitiva