By niche, he meant the food and the environment (temperature, pH) required to breed. It has been found the different species of finch on the islands have different size beaks. He stated that species cannot coexist if they have the same niche. The best-known example is the so-called "paradox of the plankton". According to the competitive exclu… This means that they each eat different sizes of seeds so they are not competing for the same resource. However, for poorly understood reasons, competitive exclusion is rarely observed in natural ecosystems, and many biological communities appear to violate Gause's law. Example: Plants consume extra nitrogen, hence leaving nothing for other plants in that area. The principle that states that two different species cannot occupy the same niche in a given habitat is called A) Pauli exclusion B) Competitive exclusion C) Mutual exclusion. Competitive exclusion principle explains what occurs when two species are adapted to live in the same niche. Interspecific: The competition that takes place between the organisms of different species is known as interspecific competition. This includes two species of finch found on the Galapagos Islands. Noted Russian ecologist G. F. Gause, in 1934, proposed the principle of competitive exclusion. All plankton species live on a very limited number of resources, primarily solar energyand minerals dissolved in the water. About This Quiz and Worksheet. Competitive exclusion is predicted by mathematical and theoretical models such as the Lotka-Volterra models of competition. There are other examples of the competitive exclusion principle. Explains what occurs when two species of finch found on the Galapagos Islands principle explains occurs! They are not competing for the same niche example: Plants consume extra nitrogen hence! Proposed the principle of competitive exclusion principle are not competing for the same niche it has found! 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