Summary of mixed-effects model analyses of leaf and root biomass and the shoot: root ratio measured for Plantago lanceolata.

Significance of seed family (SF) and interactions of seed family with the experimental factors (SF × Nutrients, SF × Light, SF × Nutrients × Light) were assessed based on the full fixed effect model. Afterwards, the set of fixed effects containing all significant predictors was determined by stepwise inclusion and model comparison. Estimated coefficients and AIC are given for the resulting best model. Intercept and slopes respectively are shown for the fixed effects and estimated standard deviations are given for the random effects.Plants were grown at two different levels of nutrient and light availability and originated from seed families collected in experimental communities of different plant diversity.