Chemosynthetic Bacteria: 10 Examples from Extreme Environments
Chemosynthetic bacteria derive energy from inorganic chemical reactions (not light) to fix carbon. They thrive in extreme habitats and drive global biogeochemical cycles.
Notable Examples
- Acidithiobacillus ferrooxidans: Acid mine drainage; oxidizes Fe²⁺ → biomining.
- Methanogens (e.g., Methanococcus): Anaerobic; CO₂ + H₂ → CH₄ — wetlands, guts, biogas.
- Halothiobacillus neapolitanus: Hypersaline; oxidizes S²⁻/S₂O₃²⁻ → Na₂SO₄ production.
- Chlorobium limicola: Freshwater mud; anoxygenic photosynthesis (bacteriochlorophyll) + S oxidation.
- Thiobacillus denitrificans: Soil/sediment; S oxidation with NO₃⁻ → denitrification, bioremediation.
- Halithermothrix orenii: Deep-sea vents; thermophilic S oxidation.
- Methanococcus maripaludis: Marine sediments; methanogenesis — biotech potential.
- Desulfovibrio desulfuricans: Sulfate-reducing; H₂S production, corrosion, wastewater.
- Aquifex aeolicus: Hydrothermal vents; hyperthermophilic H₂/S oxidation — early life analog.
- Thermotoga maritima: Hot springs; fermentative, thermostable enzymes — biotech.
Ecological Significance
Primary producers in aphotic zones; drive S, N, C, Fe cycles; basis of vent/seep food webs; bioremediation and industrial applications.
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