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Joules of energy provided by native prey consumed by four predators in treatments with (shaded bars) and without (open bars) P. antipodarum (P) and total energy (black bars) including P. antipodarum. Letters indicate significant differences of energy intake for crayfish with P. antipodarum (F = 32.15, p = 0.09) and for total energy (F = 4.7, p = 0.0006)
