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Mean total dry weight biomass of Trifolium pratense and T. repens plants 106 d following seedling exposure to snails (Helix aspersa). Eleven seedlings of each species were planted together in hexagonal arrays in 110-mm-diameter pots and at 14 d old subjected to herbivory by zero, two, five or ten snails overnight. Results of S-N-K tests showing differences between treatment means for the two Trifolium species following two-way ANOVA are shown as **, P < 0·01.
