Figure 1.

Phage infectivity toward their contemporary bacterial populations. Infectivity is broadly consistent over time when phages are in monoculture (A, B). In contrast, when phages are together in polyculture (C), infectivity increases through time (i.e., the proportion of phage susceptible bacteria increases). Small points indicate the proportion of bacterial clones infected within a single treatment replicate. Large points represent the means of phage infectivity for phage isolated and tested against bacteria from different time-points. The bars show the ± SEs. Phage 1, P1; Phage 2, P2.