10:05 AM - 10:25 AM
[MIS33-05] Microbial community succession and hydrogen utilization in hydrogen-gas rich hydrothermal plume of Kairei field, CIR
Keywords:deep sea hydrothermal plume, microbes, hydrogen gas
As results, we found 16 microbial families, e.g. Cenarchaeceae (Archaea), Helicobacterceae (epsilon proteobacteria), SUP05 (gamma proteobacteria), SAR324 (delta proteobacteria), and 3 methylotrophs, in 251 microbial families are determined to be the active and important microbial groups in the hydrothermal plume. Based on the ratio (20/1) of hydrogen and methane gas in the end member fluids of KHF, we estimate the consumed hydrogen gas from the hydrogen and methane gas concentration in each hydrothermal plume samples. The estimated consumed hydrogen gas is strongly correlated with Helicobacterceae population (R=0.65, n=28). Relatives of Helicobacterceae are known to utilize hydrogen gas/reduced sulfur compounds as electron donor. Our result suggest the Helicobacterceae in the hydrothermal plume of KHF obtain energy from hydrogen gas and the variation of H2/CH4 ratio in the plume would due to their activity.