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Mean (± s.e.) summer survival rate of the invasive Arion lusitanicus (white) and the congeneric and native Arion fuscus (grey) across the five altitudinal sites. There were significant differences between sites and species, and there was a significant interaction between site and species (table 2). Post hoc tests show that A. lusitanicus had a significantly higher survival rate at the lower three sites compared with A. fuscus (**p < 0.05; ***p < 0.001; n.s.p > 0.05).
