Table 2. Results of LMM models for grass cover and grass species richness. List of predictors: herbivore abundance; herbivore species richness; habitat = location of plots at perennial, seasonal rivers or crests; bedrock = location of plots on granite or basalt. Significant results (p < 0.05) are marked in bold, marginally significant (p = 0.1–0.05) are underlined. Herbivore abundance was log-transformed in the model with grass species richness. The marginal coefficient of determination R 2 represents the variance explained by individual predictors and all fixed predictors by the full models without accounting for variation explained by the spatial arrangement of the plots.