About this Research Topic
This Research Topic provides a platform for collecting contributions from diverse disciplines pertinent to terrestrial deep biosphere ecosystems. We consider the deep terrestrial biosphere to include non-marine ecosystems that are partially or fully closed to photosynthetically derived energy and carbon. As such, studies involving environments such as hot and cold springs, aquifers, deep fracture fluids, cave and mine systems, and sub-ice habitats can all provide insight. We seek to expand the previous research topic on the terrestrial deep biosphere (Terrestrial Portals into the Deep Biosphere) by focusing here on work that illuminates sources and uses of energy and carbon, and biogeochemical cycling in these systems. For example, energy flux and elemental cycling in the deep biosphere are still virtual unknowns. Rates of carbon fixation vs. availability and use of organic carbon in metabolic processes are undefined. We seek submissions that explore these topics with a creative use of a wide variety of tools such as isotope geochemistry, biomarker analysis, and surveys of taxonomic, genomic, and functional diversity that are directly tied to geochemical metadata.
Keywords: subsurface biosphere, diversity, extreme environments
Important Note: All contributions to this Research Topic must be within the scope of the section and journal to which they are submitted, as defined in their mission statements. Frontiers reserves the right to guide an out-of-scope manuscript to a more suitable section or journal at any stage of peer review.