FIG. 3.

Time-course changes in bacterial abundance of the strains B4, D5, and FL in pure cultures (A) and in the cocultures B4+FL (B, D, F, and H) and D5+FL (C, E, G, and I) amended with heat-killed (B to E) or live viruses F to I) and a flagellate predator, Poterioochromonas sp. (D, E, H, and I). The vertical dashed line indicates experimental amendments at t₂₈. For a further explanation of the experimental design, see Fig. 2. Values are means from triplicate treatments, and vertical bars show ± 1 SD.