Effects of plant size and covariables on species richness (SR) of herbivores (H) and their natural enemies (NE).

Species richness of herbivores and natural enemies refer to five plant individuals per plot (N = 84 plots). Species richness of natural enemies (in total and of ectophagous vs. endophagous prey/hosts) were sqrt-transformed. Parameter weights (pw) refer to a delta 2 AICc range. Explanatory variables and interactions with a parameter weight > 0.5 were considered as important for the relevant response variable and are shown in bold. Estimates (est) with standard errors (SE) were assessed from the summary table of the lme-model with the lowest AICc including all explanatory variables with a parameter weight > 0.5 and are centred and standardised to improve their interpretability. Empty cells refer to variables which were not involved in the relevant full model.