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Competition among Paramecium species.

Description
(a) Each of three species, Paramecium aurelia, Paramecium bursaria, and Paramecium caudatum, grows according to the logistic model when grown alone. (b) When P. aurelia is grown with P. caudatum, the density of P. aurelia is lowered compared to when grown alone, and P. caudatum goes extinct. (c) When P. aurelia is grown with P. bursaria, the population densities of both are lowered but they coexist.
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