Table 4.

Comparison of the sMMO and pMMO reads obtained from the brine-seawater interfaces.

Sample description	Sample depth	Oxygen concentration	Methane concentration*	sMMO 454 reads	pMMO 454 reads	pmoA clones
DD-I	2026–2042 m	0.06–0.04 mg/L	0.005–0.008 mg/L	9	0	0
ATII-I	1996–2025 m	1.5–0.8 mg/L	0.0002–0.09 mg/L	8	0	59
KB-L	1469 m	1.31 mg/L	4.43 mg/L	10	0	0
KB-U	1468 m	1.30 mg/L	0.17 mg/L	30	9	80

^*Methane concentration is based on Schmidt et al. (2003).