Supplement 1. Tab-delimited text file for the Excel database that was used to create Table 1 described in the main text.

File List Herrera-et-al-supplemental-information-data-set-used-in-analyses.txt -- (MD5: d99808cfe4ebc5bff6c4c8b75fdfaf56) Description Database used for statistical and graphical analysis described in the main text. It includes all the computational data for Fisher’s alpha, Shannon diversity, Morisita-Horn, and Sorensen’s (both qualitative and quantitative) similarity. Column definitions: 1. Taxonomic order of OTU 2. Genus and species epithet of OTU 3. OTU number 4, 6, 8, 10, 12. Identity of plant in 5 mm plots. (SSc = Sevilleta Sporobolus cryptandrus) # = plot number 5, 7, 9,11, 13. Proportion sequences of that OTU in that plant (column) in July. 14. Total number of sequences of that fungal OTU in the 5 mm plots in July 15. Contig number in sequencher. 1 = presence of OTU in a contig 16. Singletons. 1 = only one sequence of this OTU obtained 17. Proportion of sequences of row OTU in all plants in 5 mm plots in July 18. Total number of sequences of that OTU in 5 mm plots squared in July 19. Proportion of sequences of row OTU in all plants in 5 mm plots 20. Proportion multiplied by log of that same proportion). 21–37. repeat information from columns 3–20 except the information describes plants and OTUs sampled from 20 mm plots. 38–50. repeat information from columns 3–20 except the information describes plants and OTUs sampled from 0 mm (control) plots. 51. July summary of information of total number of sequences of that fungal OTU in all three plots (0, 5, 20 mm) 52. July summary of information from all three plots regarding whether that fungal OTU is present in a contig. 53. July summary of information from all three plots regarding whether that fungal OTU is present as a singleton. 54. July summary of information of total number of sequences of that fungal OTU in all three plots (0, 5, 20 mm) squared 55. July summary of the proportion of sequences of row OTU in all plants in all three plots (0, 5, 20 mm). 56. Proportion from column 55 multiplied by log of that same proportion. 57–109. Repeats information except values now represent data obtained in August 110–115. Repeats information except values now represent summary data obtained for both July and August. 116. Blank column 117–131. Multiplied squared values from pair-wise columns and rows used to calculate similarity indices. J = June, A = August, 0,5,20 correspond to mm of water added to each plot. For example, J5/J20 (column 117) corresponds to the product of the squared values for that OTU (row) obtained from plants in June from the 5mm and 20mm plots. 132–133. Blank columns 134–141. Matrix of Morisita-Horn and Sorensen’s (qualitative and quantitive) and similarity indices comparing pair-wise communities of fungi obtained from different plants: 0,5,20 mm plots obtained in July and August. Checksum values are: Columns 5, 7, and 17 = 1 All proportions of sequences from all OTUs in two plants (columns 5 and 7) and overall for July (17).