Fig. 6

Growth rate at different initial compositions. The average growth rate dependent on different relative values of diazotroph to photoautotrophic cells. 1000 iterations were generated with random values of initial biomass for each cell type. The initial fraction was calculated using the ratio of these two randomly generated numbers and dFBA was run for 400 h to simulate population development over that time period. Where growth rate was zero over three or more time steps (1 h each) or the cells were unable to manufacture their own nutrients, cell death was assumed and occurred at zero for initial fraction of diazotroph. Optimal growth was found at 0.1544 and suboptimal non-zero growth was found with diazotroph dominated initial populations. The bracket and asterisk refers to the literature predicted equilibrium concentration of cells