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#methanogens

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Public
Mikko Tuomi

The environmental conditions, energy sources and ecology of terrestrial #methanogens thriving in deep crystalline fractures, sub-sea hypersaline lakes and subglacial water bodies can be considered as analogs of a hypothetical habitable #Martian subsurface.

Mars may have a 4.3-8.8 km-deep regolith habitat at the mid-latitude location of Acidalia Planitia, that might fit the requirements of Martian methanogens.

#Mars #astrobiology
astrobiology.com/2024/11/poten

Astrobiology · Potential Habitability of Present-day Mars Subsurface for Terrestrial-like Methanogens - Astrobiologypresence of methane in the Martian atmosphere
Public
Daniel Fischer

Potential #habitability of present-day #Mars subsurface for terrestrial-like #methanogens: arxiv.org/abs/2411.15064 -> "We [...] identify a 4.3-8.8 km-deep regolith habitat at the mid-latitude location of Acidalia Planitia, that might fit the requirements for hosting putative Martian methanogens analogous to the methanogenic families Methanosarcinaceae and Methanomicrobiaceae."

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arXiv.orgPotential habitability of present-day Mars subsurface for terrestrial-like methanogensThe intense debate about the presence of methane in the Martian atmosphere has stimulated the study of methanogens adapted to terrestrial habitats that mimic Martian environments. We examinate the environmental conditions, energy sources and ecology of terrestrial methanogens thriving in deep crystalline fractures, sub-sea hypersaline lakes and subglacial water bodies considered as analogs of a hypothetical habitable Martian subsurface. We combine this information with recent data on the distribution of buried water or ice and radiogenic elements on Mars and with models of the subsurface thermal regime of this planet to identify a 4.3-8.8 km-deep regolith habitat at the mid-latitude location of Acidalia Planitia, that might fit the requirements for hosting putative Martian methanogens analogous to the methanogenic families Methanosarcinaceae and Methanomicrobiaceae.
Public
NIOO-KNAW

New publication: #Methane-cycling microbial communities from #Amazon floodplains and upland #forests respond differently to simulated #climatechange scenarios. #wetlands #globalwarming #methanogens #methanotrophs
doi.org/10.1186/s40793-024-005

BioMed CentralMethane-cycling microbial communities from Amazon floodplains and upland forests respond differently to simulated climate change scenarios - Environmental MicrobiomeSeasonal floodplains in the Amazon basin are important sources of methane (CH4), while upland forests are known for their sink capacity. Climate change effects, including shifts in rainfall patterns and rising temperatures, may alter the functionality of soil microbial communities, leading to uncertain changes in CH4 cycling dynamics. To investigate the microbial feedback under climate change scenarios, we performed a microcosm experiment using soils from two floodplains (i.e., Amazonas and Tapajós rivers) and one upland forest. We employed a two-factorial experimental design comprising flooding (with non-flooded control) and temperature (at 27 °C and 30 °C, representing a 3 °C increase) as variables. We assessed prokaryotic community dynamics over 30 days using 16S rRNA gene sequencing and qPCR. These data were integrated with chemical properties, CH4 fluxes, and isotopic values and signatures. In the floodplains, temperature changes did not significantly affect the overall microbial composition and CH4 fluxes. CH4 emissions and uptake in response to flooding and non-flooding conditions, respectively, were observed in the floodplain soils. By contrast, in the upland forest, the higher temperature caused a sink-to-source shift under flooding conditions and reduced CH4 sink capability under dry conditions. The upland soil microbial communities also changed in response to increased temperature, with a higher percentage of specialist microbes observed. Floodplains showed higher total and relative abundances of methanogenic and methanotrophic microbes compared to forest soils. Isotopic data from some flooded samples from the Amazonas river floodplain indicated CH4 oxidation metabolism. This floodplain also showed a high relative abundance of aerobic and anaerobic CH4 oxidizing Bacteria and Archaea. Taken together, our data indicate that CH4 cycle dynamics and microbial communities in Amazonian floodplain and upland forest soils may respond differently to climate change effects. We also highlight the potential role of CH4 oxidation pathways in mitigating CH4 emissions in Amazonian floodplains.
Public
Lukas VFN 🇪🇺

How #microbes extract important #metals from their environment
phys.org/news/2023-10-ancient-

#Methanogens acquire and bioaccumulate #nickel during reductive dissolution of nickelian #pyrite: Rachel Spietz et al. journals.asm.org/doi/10.1128/a

"These findings help differentiate between two competing hypotheses about the reduction in atmospheric #methane billions of years ago that was likely caused by a reduction in the #methanogen population."

scanning electron microscopy image of Methanosarcina barkeri
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