Figure 4.

Interspecific interactions of bacteria in the bean phyllosphere. The graphs give the relative frequency of significant aggregation (yellow/light gray), randomness (medium gray) and scarcity (blue/dark gray) at different scales as determined by inhomogeneous cross-type pair correlation functions using random toroidal shifts as a null model. (A), (C): aggregation of individuals of P. agglomerans around individuals of P. syringae. (B), (D): aggregation of P. syringae around P. agglomerans. In (A) and (B), both strains were inoculated jointly and incubated for 0–72 h. In (C) and (D), P. syringae was inoculated first and incubated for 92 h before P. agglomerans was inoculated. After inoculation with P. agglomerans, these samples were incubated for another 0–72 h. Number of samples was 41 in all four analyses.