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Average numbers of escapes per treatment (+SE). Grey bars Both species present, black bars one species present. a, d I. degenerans was the resident (released on patch R), N. cucumeris the invader (released on patch Inv; Fig. 2). b, c N. cucumeris was the resident, I. degenerans the invader. *** the number of escapes differed significantly between treatments (P < 0.001. Ns not signficant). For abbreviations, see Fig. 2
