Fig. 9

Variation in incidence of signaling populations as resource abundance and population size is varied. Signaling positive populations (blue) are involved in metabolic signaling and their frequency is seen to increase as the population sizes are increased. An increase in resource abundance also increases the effect of population size on their incidence. Lower populations give way to signaling at lower resource abundances. A total of 100 replicate populations were used for these experiments, the deficit below 100 indicates the number of extinctions before the populations could evolve to the end of the run