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(a) ATP in circulating groundwater; (b) ATP on rock grains; (c) TNCs in circulating groundwater; and (d) the number of VLPs per cell in circulating groundwater in the three FCCs supplemented with 2.2 mℳ O2 plus 7.9 mℳ N2 (•), 11 mℳ methane (▪) and 10 mℳ H2 plus 11 mℳ methane (▴). Whiskers indicate ±1 s.d.; n=3 in a, c; and n=6 in b.
