Fig. 3

Linear model coefficients for P. fluorescens siderophore non-producers (top panel) and producers (bottom panel) strains grown as single genotypes. Positive or negative coefficients indicate species that contribute more or less to P. fluorescens growth compared to an average species [26]. We find that Erwina sp (sp. 5) significantly increases final densities of siderophore-producing P. fluorescens relative to other community species, while Rhodococcus sp. (sp. 8) reduces final densities of non-producers, relative to the effect of all other community species (see main text for statistics)