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Nonproducer relative fitness (W) when producer and nonproducing strains are grown in isolation (high relatedness). W increases in the presence of the community, but only under copper‐contaminated conditions (community × copper interaction, F 1,20= 7.25, P = 0.01), where siderophores act as interspecific public goods. When W = 1, growth of nonproducer and producer is equal. Error bars represent SE.
