Territorial defense: vulnerability of naïve and mature communities to an invading species producing varying number of antimicrobial agents.

1Naive community: 50 cells, on average corresponding to 50 species, harboring a total of 181 AM production genes, and the same number of resistance genes.2Mature community: 50 cells, corresponding to 15 species harboring a total of 109 AM genes and 180 resistance genes on the average.3All numbers indicate the average of 100 experiments.