Coexistence of Two Asexual Strains on a Single Resource

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Science  17 Mar 1972:
Vol. 175, Issue 4027, pp. 1272-1274
DOI: 10.1126/science.175.4027.1272


A stable equilibrium was obtained for two F- strains of Escherichia coli in a glucose minimal medium. This equilibrium cannot readily be explained by traditional models of population genetics and apparently violates some forms of the ecological principle of competition exclusion. A mechanism involving an inverse relationship between the growth rates of these strains at the exponential and "stationary" phases is suggested as a possible explanation for the observed stable equilibrium.