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Increased durability enhances fitness. The effect of pyoverdin (pvd) supplementation—which mimics the presence of durable pyoverdin produced by a previous generation—on the growth of cooperator (gray bars) and cheat (white bars) monocultures. Pyoverdin supplementation significantly increased growth, with growth stimulation being more pronounced in cheat than in cooperator monocultures in all 11 strain pairs. *P < 0.05. ns, not significant.
