Fig. 3: System-specific DOM-RSH concentrations and MeHg(DOM-RS) stability constants.

a Total in situ dissolved organic matter thiol concentrations (log nM DOM-RSH) and b stability constant Log K values for MeHg(DOM-RS) as described by Eq. (2) for each site grouping across the terrestrial to marine aquatic continuum. Significant differences among the site groupings are noted by the letters above the boxes. The number of sites in each group and the individual site data can be found in Table 1. The top and bottom edges of each box correspond to the first and third data quartiles, respectively, while the center line represents the data mean. Whiskers extend to the furthest data points. Source data are provided as a Source Data file.