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Deep Subsurface Microbiology
Deep subsurface microbiology is a highly active and rapidly advancing research field at the interface of microbiology and the geosciences; it focuses on the detection, identification, quantification, cultivation and activity measurements of bacteria, archaea and eukaryotes that permeate the subsurface biosphere of deep marine sediments and the basaltic ocean and continental crust. The deep subsurface biosphere abounds with uncultured, only recently discovered and – at best - incompletely understood microbial populations. In spatial extent and volume, Earth's subsurface biosphere is only rivaled by the deep sea water column. So far, no deep subsurface sediment has been found that is entirel...
Deep Carbon Science
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Astrobiology At The Interface: Interactions Between Biospheres, Geospheres, Hydrospheres And Atmospheres Under Planetary Conditions
The Topic Editors would like to acknowledge Dr. Yuko Kawaguchi for her contribution in designing and organizing this editorial project.
From Cold Seeps to Hydrothermal Vents: Geology, Chemistry, Microbiology, and Ecology in Marine and Coastal Environments
Seafloor fluid and gas emission has been revealed to be a geographically widespread phenomenon in recent years as researchers have discovered new off-axis hydrothermal vent fields and previously unmapped shallow (deltaic, continental shelf) and deep water cold seeps. Seafloor seep emissions play a critical role in global biogeochemical cycles, but also contribute to the development of economically important mineral deposits that are increasingly targeted for exploitation. Hydrothermal vents and cold seeps host unique microbiological and macrofaunal communities that provide clues to life on primordial Earth, and seafloor fluid and gas emissions play a complex role in microbial dispersal, ocean chemistry, plankton dynamics, and possibly global climate. This Research Topic will address the knowledge gaps about the linked chemistry, macro/microbiology, physics, and geology of seafloor emissions and explore both the economic potential and conservation efforts associated with hydrothermal vents and cold seeps.
Natural Methane Emissions in a Changing Arctic - Implications for Climate and Environment
Natural emissions of methane have received much attention over the last decade due to the documented increase of methane in the atmosphere and high global warming potential relative to CO2. Over the past few decades the Arctic has been warming approximately four times faster than the rest of the planet, driving a pressing need to assess the current and future vulnerability of various natural methane sources. In the Arctic, vast amounts of methane is stored in soils and permafrost or is being generated as permafrost thaw continues. Additionally, there are large stores of methane in Arctic gas hydrates, a solid form of concentrated methane and water, and in numerous settings, including deep-water marine areas, on continental shelves hosting relict subsea permafrost and gas hydrate, in and beneath onshore permafrost, and likely beneath the Greenland Ice Sheet. Continued climate warming is making methane leakage more likely. Even deeper conventional gas reservoirs could leak methane as the overlying permafrost degrades.
Thermophilic and Halophilic Extremophiles in Eurasian Environments
The eBook is the product of a partnership between the Norwegian Eurasia Program and the China Silk Road Program. At the present, our knowledge on microbiology and biogeochemistry from Eurasian (hyper)saline and thermal ecosystems is limited. Such information is essential to the field and contributes to a comprehensive understanding of microbial metabolic pathways and functions involved in biogeochemical processes in extreme ecosystems. This eBook includes a series of recent progress in microbial diversity, ecological functions, and biogeochemistry in Eurasian (hyper)saline and thermal ecosystems with the use of next generation sequencing, omics technologies and interdisciplinary collaboratio...
Microbial Connections Between the Subsurface Sulfur Cycle and Other Elemental Cycles
Sulfur has many redox states and is a major metabolite in suboxic and anaerobic environments including, but not restricted to, marine and marginal marine sediments, the water column of oxygen minimum zones, salt marshes and oil wells. Microbially mediated redox cycling of sulfur typically comprises dissimilatory sulfate reduction (MSR), sulfide reoxidation, disproportionation and the oxidation and reduction of sulfur redox intermediates. These processes contribute to the degradation of organic matter, link the cycles of sulfur and carbon, control the production and consumption of methane and are critical for the long term budget of O2 in the atmosphere. Microbial and abiotic processes at red...
Microbial Responses to Environmental Changes
Advances in next generation sequencing technologies, omics, and bioinformatics are revealing a tremendous and unsuspected diversity of microbes, both at a compositional and functional level. Moreover, the expansion of ecological concepts into microbial ecology has greatly advanced our comprehension of the role microbes play in the functioning of ecosystems across a wide range of biomes. Super-imposed on this new information about microbes, their functions and how they are organized, environmental gradients are changing rapidly, largely driven by direct and indirect human activities. In the context of global change, understanding the mechanisms that shape microbial communities is pivotal to p...
