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Progress in Earth and Planetary Science
Figure 6 | Progress in Earth and Planetary Science

Figure 6

From: Theoretical constraints of physical and chemical properties of hydrothermal fluids on variations in chemolithotrophic microbial communities in seafloor hydrothermal systems

Figure 6

Metabolic energy yields versus H2S, H2, CH4, and Fe2+ concentrations in hydrothermal fluids. Potential metabolic energy available from (A) thiotrophic (H2S-oxidizing) O2 reduction as a function of the H2S concentration in the end-member hydrothermal fluid; (B) hydrogenotrophic O2 reduction, (C) hydrogenotrophic SO4 reduction, and (D) hydrogenotrophic methanogenesis as a function of the H2 concentration in the end-member hydrothermal fluid; (E) aerobic methanotrophy and (F) anoxic methanotrophy as a function of the CH4 concentration in the end-member hydrothermal fluid; and (G) Fe2+-oxidizing O2 reduction as a function of the Fe2+ concentration in the end-member hydrothermal fluid are plotted for each kilogram of mixing water for four temperature ranges. The temperature ranges of <25°C, 25°C to 45°C, 45°C to 80°C, and 80°C to 125°C generally correspond to psychrophilic, mesophilic, thermophilic, and hyperthermophilic microbial components, respectively.

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