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Siderophores act as an interspecific public good in toxic copper broth. Mean Malthusian growth rate (m) ± SE of a siderophore‐producing (black bars) and non‐producing (white bars) strain of Pseudomonas aeruginosa in toxic copper broth (0.6 mm CuSO4). The addition of heterospecific siderophores (ferrioxamine E, ornibactin, schizokinen and yersiniabactin) reduces mean growth differences between producing and non‐producing strains.
