FIG 3.

Effect of predators on different prey bacteria and vice versa as determined by the CFU-based predation assay. (A) Mean killing efficiency (ē; ± 95% confidence interval) of all three Lysobacter spp. tested against different species of prey bacteria (percent). Asterisks denote significant differences between the number of prey CFU of the control group (i.e., monocultures) and samples containing both predator and prey (i.e., cocultures) (Mann-Whitney U test: ***, P < 0.001 *, P < 0.05; #, P < 0.07; df = 2). (B) Mean prey utilization (ū; ± 95% confidence interval) of all three Lysobacter spp. tested against different species of prey bacteria (percent). Asterisks denote significant differences in the prey utilization when comparing control groups consisting exclusively of predators with samples containing both predators and prey (Wilcoxon test: *, P < 0.05; #, P < 0.07). n.d., prey species for which u was not determined.