Table 1 Aqueous biogeochemistry

From: Methane- and dissolved organic carbon-fueled microbial loop supports a tropical subterranean estuary ecosystem

  Meteoric freshwater MFW Meteoric brackish water MBW Saline groundwater SGW Sinkhole (cenote) POOL Coastal water SEA
Salinity (psu) 0.26 ± 0.03 (8) 1.81 ± 0.04 (29) 32.87 ± 0.94 (13) 0.94 ± 0.09 (6) 35.45 ± 0.39 (6)
[SO4 2−] mM 0.3 ± 0.1 (7) 1.6 ± 0.1 (27) 26.4 ± 1.0 (11) 0.8 ± 0.1 (6) 28.4 ± 0.6 (4)
[CH4] nM 6466 ± 659 (8) 157 ± 16 (28) 110 ± 17 (12) 495 ± 148 (6) 121 ± 28 (6)
δ13C-CH4 −66.3 ± 0.7 (7) −52.7 ± 1.9 (25) −56.3 ± 1.5 (11) −50.6 ± 4.9 (6) −59.0 ± 2.1 (5)
[DOC] µM 661 ± 132 (3) 131 ± 16 (16) 41 ± 20 (3)
δ13C-DOC ‰ −28.0 ± 0.1 (3) −28.3 ± 0.2 (16) −26.6 ± 0.4 (3)
[DIC] mM 4.4 ± 0.2 (6) 7.1 ± 0.2 (24) 2.4 ± 0.2 (10) 5.3 ± 0.2 (3) 2.0 ± 0.1 (3)
δ13C-DIC ‰ −16.4 ± 1.0 (7) −11.1 ± 0.7 (25) −6.3 ± 1.0 (11) −9.4 ± 2.1 (3) −4.3 (2)
POC µM 10.9 ± 3.8 (3) 5.0 ± 2.3 (3) 3.0 ± 0.9 (3) 32.3 ± 14.9 (3) 5.8 (1)
δ13C-POC ‰ −28.5 ± 0.5 (3) −27.6 ± 0.7 (3) −27.1 ± 1.0 (3) −28.0 ± 0.3 (3) −20.1 (1)