CONFLICT OF INTEREST STATEMENT The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest. Supporting Information Filename Description hyp14964-sup-0001-supinfo.pdfPDF document, 4.6 MB Data S1. Supporting Information. REFERENCES , , & (1994). Seasonal variations in production and consumption rates of dissolved organic carbon in an organic-rich coastal sediment.