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)

  1. Values of water column constituents, presented as average ± std. error (n), from the different regimes of the groundwater system and the adjacent coastal sea. Values were calculated from all measurements within a water mass across all sampling events. For further information regarding data obtained during the separate sampling events, see the supplement (Supplementary Tables 2, 3)
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