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. Author manuscript; available in PMC: 2017 Aug 1.
Published in final edited form as: Evolution. 2016 Jun 24;70(8):1871–1881. doi: 10.1111/evo.12973

Figure 2.

Figure 2

Change in percentage of cooperators in the S. enterica population over time in the laboratory. In the 2-species system (diamonds) cooperators in the S. enterica population stabilized at an intermediate frequency. In the 3-species system with M. extorquens as an exploiter (triangles) cooperators reached a higher equilibrium frequency. When M. extorquens acts as mutualist (circles) cooperators reached a lower equilibrium frequency. Three replicates for each treatment were transferred to new plates every 96 hours. Error bars represent standard errors; some are smaller than the symbols.