Fig. 4

Trophic graph of the initial community. N1 – non-specific substrate consumed by all populations (P1, P2, P3) of the community. S1, S2, S3 – specific substrates synthesized by corresponding cells. $P1\stackrel{S2}{\to }P2$ means that cells of P1 population produce S2 substrate, which is consumed by cells of P2 population