FIG. 5.

Time-course changes in abundance of B4 strains during the period after the sample manipulation (t₂₈ to t₈₅). (A) Example of the virus concentration effect, when the abundance of strain B4 was significantly lower at t₆₇ and t₈₅ (P < 0.01, Tukey's HSD test) in the LVC than in the basal live virus treatment (LV). (B) Trends in B4 abundance in HV and HVC treatments. (C) Example of the synergistic effect of both mortality sources (live viruses and a bacterivore) significantly accelerating mortality of B4 strains at t₆₇ and t₈₅ compared to the treatments amended by heat-killed viruses and a bacterivores (D). Treatments labeled + P, e.g., B4 − HV + P, received a bacterivore, Poterioochromonas sp. Values are means from triplicate treatments, and vertical bars show ± 1 SD.