Figure 4.

Choice indices for circular patches of basal prey. The leftmost section shows the prefe-rence of C. elegans for E. coli over F. johnsoniae. The next two sections show the choice of the worms between a mono-species patch of basal prey (indicated above the panel, E. coli = blue or F. johnsoniae = red) and a second patch (indicated on the x-axis) consisting of basal prey mixed with M. xanthus either strain S or strain N. Bars are means from three biological replicates and error bars are 95% confidence intervals. For the choice E. coli/E. coli + M. xan_S the error bar is zero. In some instances, 95% confidence intervals extend outside the range of what is biologically possible, [−1,1], so we restricted them to reflect the biological reality. ‘F. john’ = F. johnsoniae, ‘M.xan_N’, ‘M.xan_S’ = M. xanthus strains N and S, respectively.