Figure X. A, B

Figure X. A, B show DAPI-stained cells from vent fluids from the Mid-Cayman Rise and C shows methane generation in vent fluids labeled with various stable carbon isotope substrates. The shallow ultramafic site (VD) appears to have more autotrophic metabolism at 70°C than the deep basalt-hosted site (PD). No methane generation is seen in background seawater.

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