Competition between Species: Frequency Dependence

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Science  26 Feb 1971:
Vol. 171, Issue 3973, pp. 820-824
DOI: 10.1126/science.171.3973.820


Whether two species competing for the same limited resources can stably coexist has been subject to controversy for several decades. The relative fitnesses of two species of Drosophila under competition in laboratory populations are shown to be inversely related to the relative frequencies of these species. This frequency-dependent fitness leads to a stable coexistence of the two species in spite of their competition for limited resources.