The distribution, diversity and function of predominant Thermoproteales in high‐temperature environments of Yellowstone National Park

A comprehensive study of Thermoproteales, a crenarchaeal order thriving in high-temperature environments (>70°C), reveals distinct distribution patterns and functional adaptations across geochemically diverse habitats in Yellowstone National Park. The research identifies Thermocladium, Vulcanisaeta, and Caldivirga as dominant genera in low-pH (pH < 5) settings, while Thermoproteus and Pyrobaculum prevail in mildly acidic to higher pH sulfur sediments and filamentous streamer communities, respectively. Metabolic reconstructions indicate these populations are primarily chemoorganotrophs utilizing varied electron acceptors based on geochemical conditions. Notably, potential CO₂ fixation pathways linked with NiFe hydrogenases suggest a symbiotic relationship with high H₂ levels in sulfidic systems, providing energy for inorganic carbon fixation.

Jay, Z. J., Beam, J. P., Kozubal, M. A., Jennings, R. deM., Rusch, D. B., & Inskeep, W. P. (2016). The distribution, diversity and function of predominant Thermoproteales in high‐temperature environments of Yellowstone National Park. Environmental Microbiology, 18(12), 4755–4769. Portico. https://doi.org/10.1111/1462-2920.13366