Fig. 7
The Canonical Correspondence Analysis (CCA) of the most abundant bacterial and fungi identified from the SRS and ORR Hg contaminated sites, based on the shotgun sequencing, with respect to the total mercury (THg), methyl mercury (MeHg), bioavailable mercury (BHg), and gene copy numbers of total soil bacteria (16S) and total soil fungi (18S) from qPCR analysis. For bacteria at phylum level (a), Actinomycetota, Pseudomonadota, and Bacteroidota were positively associated with the THg, and MeHg, while the Bacillota were positively associated with the BHg. At the genus level (b), Burkholderia and Pseudomonas were positively associated with THg and MeHg, while Pedospaera and Candidatus Solibacter were positively associated with BHg. For fungi (c), Ascomycota and Basidomycota, the two most dominant phyla, were positively associated with THg and MeHg, while Blastocladiomycota was positively associated with BHg.
