Table 1. Water physicochemistry and microbial cell counts for different water bodies in the cave.

	Mixed cave water		Mineral spring water		Meteoric seepage water
	Median	Min.–max.	Median	Min.–max.	Median	Min.–max.
Physicochemistry
Temperature	7.9	7.2 to 11.7	7.2		8.6a
EC (μS cm−1)	2100	2020 to 2200	6200b	5890 to 6900b	526a
pH	7.5	7.2 to 7.6	7.6b	7.2 to 8.3b	8.3a
O2 (mg l−1)	4.3	2.3 to 5.5	3.2	2.3 to 3.4	8.5a
Nutrients, electron acceptors
DOC (mg l−1)	1.2	0.8 to 1.4	0.7b	0.5 to 0.9b	0.6a
NO3− (mg l−1)	1.9	0.8 to 3.4	bd	bd to 0.2	5.6	4 to 5.6
PO43− (mg l−1)	bd	bd	bd	bd to 0.02	0.01	0.01 to 0.02
SO42− (mg l−1)	2.1	1.1 to 3	bd	bd to 1.7	4.2	3.4 to 4.2
FeTotal (mg l−1)	NA	0.87c	0.46 to 1c	NA
Water mineralization
Na+ (mg l−1)	93.9	51.9 to 328.6	649.8	581.3 to 1131.1	5	5 to 18.8
K+ (mg l−1)	1.6	1.2 to 3	4.6	4.2 to 8.6	1	1 to 1.4
Mg2+ (mg l−1)	22.8	20.7 to 140.7	24.4	23.1 to 55.3	23	22.2 to 23.3
Ca2+ (mg l−1)	97.2	62.1 to 205.1	51.5	50.2 to 111.9	82.2	76.9 to 82.5
Cl− (mg l−1)	154	77.5 to 606.6	1301.7	1237.9 to 2248.3	1.1	1.1 to 4.6
Br− (mg l−1)	1.3	0.7 to 4.6	19.2	16.1 to 29.4	0.01	0.01 to 0.03
I (mg l−1)c	3.2	0.9 to 5	20.5	20 to 30.7	NA
Water isotopes
δ18Od	−10.5	−10.8 to −10.2	−8	−9.6 to −7.7	−11	−11.8 to −10
δ2Hd	−73.9	−74.7 to −73.2	−67.2	−69.1 to −66.5	−75.4	−82.3 to −68
TU	7.1		4.8		8.3a
Cell counts
	1.6 × 106	3.7 × 105 to 1.9 × 106	3.1 × 103	2.7 × 103 to 1.9 × 106	6.7 × 103	6.6 × 103 to 2.4 × 105

Abbreviations: bd, below detection limit; DOC, dissolved organic carbon; EC, electric conductivity; NA, not analyzed; TU, tritium units defined as ratio of 1 ³H atom to 10¹⁸ H atoms.

^aSingle measurement in December 2012.

^bThis study (n=4) and routine monitoring data from LfU (n=4).

^cLfU monitoring data (n=4) from October 2011 to April 2012.

^dThis study (n=3) and LfU monitoring data (n=4).