FIG 4.

Ordination of canonical correspondence analysis (CCA) of the fungal community composition based on pyrosequencing of the fungal ITS region (plus symbols) with groundwater geochemistry (vectors). The percentages of variation explained by each axis are shown. Groundwater samples are abbreviated and referenced in Table S1 in the supplemental material. Solid red circles, groundwater samples with pHs below 4.5; solid green circles, groundwater samples with pHs above 4.5. Red vectors are the variables, and plus symbols represent the ordination of taxa at the taxonomic level of class.