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SUMMARY:Methane mitigation by unique redox couplings in freshwater sediments
DESCRIPTION:<p>This talk tests the ability of natural freshwater lakes and margins to attenuate the emissions of</p><p>the greenhouse gas methane (CH4) to the atmosphere under warming climate. I will show how</p><p>microbial communities manage to survive and mitigate methane emissions under energy</p><p>limited, highly reduced conditions of deep methanogenic lake sediments, through redox</p><p>couplings of methane to Mn-Fe-N. Complex redox couplings between those species were also</p><p>explored in thermokarst lakes and margins, which are extensively formed by permafrost thaw</p><p>in the Arctic. The cycles were quantified using geochemical and microbial profiles, together</p><p>with stable isotope probing experiments close to natural conditions. The profiles and</p><p>incubations show active microbial population that exhibit surprisingly both aerobic and</p><p>anaerobic methane oxidation in methanogenic sediments and upland Arctic soils, fueled by</p><p>nitrogen and iron redox cycles.</p>
LOCATION:
TRANSP:OPAQUE
URL:https://www.weizmann.ac.il/EPS/events
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