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Pore water geochemistry and 16S rRNA gene abundances along depth. Target taxonomic units for qPCR analyses include archaea (solid triangles), ANME-2a amplified by primers A426f (solid circles) and A426fm (open circles), bacteria (open squares) and Desulfuromonas/Pelobacter (solid squares). Data points at 0 cm represent the characteristics of the bubbling fluids. The results obtained from core LGH02-c1 are adopted from Chang et al. (2012).
