Figure Legends
Figure 1. Spearman’s rank correlation between the growth response of Bromus and Koeleria to our soil inocula. Responses are presented as t -scores (unitless) based on the comparison of plant growth for inoculated replicates vs. for sterile controls.
Figure 2. Microbial guilds associated with plant growth response to our soil inocula. In a) for prokaryotes, and in b) for fungi, we show the number of OTUs that are beneficial (green “+” symbols) or detrimental (red “-“ symbols) to Bromus and/orKoeleria . “0” in the left panels indicate no plant growth response. Only bins (e.g. +,+) that had associated OTUs were included though all were tested.
Figure 3. Redundancy analyses (RDAs) depicting the association between OTUs and their predictors (i.e., soil properties and plant community structure). a) and b) show RDAs for the non-indicator prokaryotes and the indicator prokaryotes, respectively. Likewise, c) and d) show RDAs for the non-indicator fungi the indicator fungi, respectively. Each symbol represents a single OTU, and is colour coded in b) and d) as a function of its impact on Bromus and/orKoeleria . Percentages on the canonical axes indicate the amount of inertia constrained. Abbreviations: NH4+ and NO3- are respectively, soil KCl-extractible ammonium and nitrates; PO43- = Mehlich-III-extractible phosphorus ; % Moist = gravimetric soil moisture ; Veg 1 to 5 = site scores from the 5 principal components of the plant community ordination (PCA on Hellinger-transformed community data).