Hydrothermal ecotones and streamer biofilm communities in the Lower Geyser Basin, Yellowstone National Park

Scientists have identified a novel hydrothermal ecotone—a transitional zone between hot chemosynthetic and cooler photosynthetic environments—in the Lower Geyser Basin of Yellowstone National Park. This ecotone hosts a diverse community of microorganisms, particularly in springs that support streamer biofilm communities (SBCs). While Aquificales bacteria dominate the hottest environments across both SBC and non-SBC sites, Thermotogales-like organisms appear exclusively in SBC locations, suggesting their potential role in biofilm formation. The study used 16S rRNA sequencing to analyze microbial diversity, revealing novel taxa—especially among Crenarchaeota—and demonstrating that geochemical gradients shape community structure. This discovery provides new insights into the dynamics of hydrothermal ecosystems and the conditions favoring SBC development.

Meyer‐Dombard, D. R., Swingley, W., Raymond, J., Havig, J., Shock, E. L., & Summons, R. E. (2011). Hydrothermal ecotones and streamer biofilm communities in the Lower Geyser Basin, Yellowstone National Park. Environmental Microbiology, 13(8), 2216–2231. Portico. https://doi.org/10.1111/j.1462-2920.2011.02476.x