New Phytologist Supporting Information Figs S1–S5 and Table S1 Integrating ecology and physiology of root-hemiparasitism: abiotic resources shape the balance between root parasitism and shoot competition Jakub Těšitel, Tamara Těšitelová, James P. Fisher, Jan Lepš and Duncan D. Cameron Article acceptance date: 24 July 2014 The following Supporting Information is available for this article: Fig. S1 Relative water content (in volumetric percent) in substrate of experimental pots measured before the final irrigation of the experiment. Values for each pot are based on an average of three subsequent reads. Box colours illustrate the irrigation and nutrient levels. See Table S1 for a summary of corresponding mixed-effect model. Fig. S2 Root biomass of the two host species cultivated under individual experimental treatments. Bar colours illustrate the irrigation and nutrient levels. See Table S1 for a summary of corresponding mixed-effect model. Fig. S3 Pattern of the total above-ground biomass production in individual pots (i.e. sum of host + hemiparasite). Bar colours illustrate the irrigation and nutrient levels. See Table S1 for a summary of corresponding mixed-effect model. Fig. S4 Carbon stable isotope composition (δ13C) of bulk above-ground biomass of the two host species cultivated under individual experimental treatments. Box colours illustrate the irrigation and nutrient levels. See Table S1 for a summary of corresponding mixed-effect models. Fig. S5 Carbon stable isotope composition (δ13C) of bulk above-ground biomass of Rhinanthus alectorolophus attached to either of the host species and cultivated under individual experimental treatments. Box colours illustrate the combinations of irrigation and nutrient levels. See Table S1 for a summary of corresponding mixed-effect model. Table S1 Summary of mixed-effect models describing the effects of host species identity, abiotic resources and infection by the hemiparasite on the supplementary parameters of the Irrigation *** ↑ ns ns Nutrients *** ↓ *** ↑ *** ↑ ns ns Infected *** M ** ↑ ns *↓ ***↓ **↑ ns *↑ Host×Irrigation * Host×Nutrients Irrigation×Nutrients Rhinanthus biomass δ13C ns Wheat biomass δ13C *M Maize biomass δ13C Total above-ground biomass production in the pot Host Species Host root biomass Relative water content in substrate experimental hemiparasitic associations. *** ns ** *** ** ns Host×Infected Irrigation×Infected ns Nutrients×Infected ** *** Host×Irrigation×Nutrients ** ** Host×Irrigation×Infected Host×Nutrients×Infected Irrigation×Nutrients× Infected * Host×Irrigation×Nutrients× Infected ***, P ≤ 0.001; **, P ≤ 0.01; *, P ≤ 0.05; ns, terms with non-significant regression slopes retained in the model due to significant higher order interactions. Empty and grey fields, terms omitted from the model during the model selection and terms which are not available for particular model, respectively. Arrows, the direction of change of response variable for statistically significant main effects (an arrow upwards or downwards indicates that a response variable increases or decreases with that factor, respectively); M, the host species (maize) associated with the higher values of response variable. Methods S1 R code of model selection and summaries for the results reported in the main text. Methods S2 R code of model selection and summaries for the results reported in the Supporting Information.