Microbial methane cycling in sediments of Arctic thermokarst lagoons
Thermokarst lagoons represent the transition state from a freshwater lacustrine to a marine environment, and receive little attention regarding their role for greenhouse gas production and release in Arctic permafrost landscapes. We studied the fate of methane (CH4) in sediments of a thermokarst lag...
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ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_5015516 2023-05-15T15:00:02+02:00 Microbial methane cycling in sediments of Arctic thermokarst lagoons Yang, S. Anthony, S. Jenrich, M. in ‘t Zandt, M. Strauss, J. Overduin, P. Grosse, G. Angelopoulos, M. Biskaborn, B. Grigoriev, M. Wagner, D. Knoblauch, C. Jaeschke, A. Rethemeyer, J. Kallmeyer, J. Liebner, S. 2023-02-22 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5015516 unknown info:eu-repo/semantics/altIdentifier/doi/10.1111/gcb.16649 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5015516 Global Change Biology info:eu-repo/semantics/article 2023 ftgfzpotsdam https://doi.org/10.1111/gcb.16649 2023-03-06T00:34:40Z Thermokarst lagoons represent the transition state from a freshwater lacustrine to a marine environment, and receive little attention regarding their role for greenhouse gas production and release in Arctic permafrost landscapes. We studied the fate of methane (CH4) in sediments of a thermokarst lagoon in comparison to two thermokarst lakes on the Bykovsky Peninsula in northeastern Siberia through the analysis of sediment CH4 concentrations and isotopic signature, methane-cycling microbial taxa, sediment geochemistry, lipid biomarkers, and network analysis. We assessed how differences in geochemistry between thermokarst lakes and thermokarst lagoons, caused by the infiltration of sulfate-rich marine water, altered the microbial methane cycling community. Anaerobic sulfate-reducing ANME-2a/2b methanotrophs dominated the sulfate-rich sediments of the lagoon despite its known seasonal alternation between brackish and freshwater inflow and low sulfate concentrations compared to the usual marine ANME habitat. Non-competitive methylotrophic methanogens dominated the methanogenic community of the lakes and the lagoon, independent of differences in porewater chemistry and depth. This potentially contributed to the high CH4 concentrations observed in all sulfate-poor sediments. CH4 concentrations in the freshwater-influenced sediments averaged 1.34±0.98 μmol g-1, with highly depleted δ13C-CH4 values ranging from -89‰ to -70‰. In contrast, the sulfate-affected upper 300 cm of the lagoon exhibited low average CH4 concentrations of 0.011±0.005 μmol g-1 with comparatively enriched δ13C-CH4 values of -54‰ to -37‰ pointing to substantial methane oxidation. Our study shows that lagoon formation specifically supports methane oxidizers and methane oxidation through changes in pore water chemistry, especially sulfate, while methanogens are similar to lake conditions. Article in Journal/Newspaper Arctic permafrost Thermokarst Siberia GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) Arctic Global Change Biology |
institution |
Open Polar |
collection |
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
op_collection_id |
ftgfzpotsdam |
language |
unknown |
description |
Thermokarst lagoons represent the transition state from a freshwater lacustrine to a marine environment, and receive little attention regarding their role for greenhouse gas production and release in Arctic permafrost landscapes. We studied the fate of methane (CH4) in sediments of a thermokarst lagoon in comparison to two thermokarst lakes on the Bykovsky Peninsula in northeastern Siberia through the analysis of sediment CH4 concentrations and isotopic signature, methane-cycling microbial taxa, sediment geochemistry, lipid biomarkers, and network analysis. We assessed how differences in geochemistry between thermokarst lakes and thermokarst lagoons, caused by the infiltration of sulfate-rich marine water, altered the microbial methane cycling community. Anaerobic sulfate-reducing ANME-2a/2b methanotrophs dominated the sulfate-rich sediments of the lagoon despite its known seasonal alternation between brackish and freshwater inflow and low sulfate concentrations compared to the usual marine ANME habitat. Non-competitive methylotrophic methanogens dominated the methanogenic community of the lakes and the lagoon, independent of differences in porewater chemistry and depth. This potentially contributed to the high CH4 concentrations observed in all sulfate-poor sediments. CH4 concentrations in the freshwater-influenced sediments averaged 1.34±0.98 μmol g-1, with highly depleted δ13C-CH4 values ranging from -89‰ to -70‰. In contrast, the sulfate-affected upper 300 cm of the lagoon exhibited low average CH4 concentrations of 0.011±0.005 μmol g-1 with comparatively enriched δ13C-CH4 values of -54‰ to -37‰ pointing to substantial methane oxidation. Our study shows that lagoon formation specifically supports methane oxidizers and methane oxidation through changes in pore water chemistry, especially sulfate, while methanogens are similar to lake conditions. |
format |
Article in Journal/Newspaper |
author |
Yang, S. Anthony, S. Jenrich, M. in ‘t Zandt, M. Strauss, J. Overduin, P. Grosse, G. Angelopoulos, M. Biskaborn, B. Grigoriev, M. Wagner, D. Knoblauch, C. Jaeschke, A. Rethemeyer, J. Kallmeyer, J. Liebner, S. |
spellingShingle |
Yang, S. Anthony, S. Jenrich, M. in ‘t Zandt, M. Strauss, J. Overduin, P. Grosse, G. Angelopoulos, M. Biskaborn, B. Grigoriev, M. Wagner, D. Knoblauch, C. Jaeschke, A. Rethemeyer, J. Kallmeyer, J. Liebner, S. Microbial methane cycling in sediments of Arctic thermokarst lagoons |
author_facet |
Yang, S. Anthony, S. Jenrich, M. in ‘t Zandt, M. Strauss, J. Overduin, P. Grosse, G. Angelopoulos, M. Biskaborn, B. Grigoriev, M. Wagner, D. Knoblauch, C. Jaeschke, A. Rethemeyer, J. Kallmeyer, J. Liebner, S. |
author_sort |
Yang, S. |
title |
Microbial methane cycling in sediments of Arctic thermokarst lagoons |
title_short |
Microbial methane cycling in sediments of Arctic thermokarst lagoons |
title_full |
Microbial methane cycling in sediments of Arctic thermokarst lagoons |
title_fullStr |
Microbial methane cycling in sediments of Arctic thermokarst lagoons |
title_full_unstemmed |
Microbial methane cycling in sediments of Arctic thermokarst lagoons |
title_sort |
microbial methane cycling in sediments of arctic thermokarst lagoons |
publishDate |
2023 |
url |
https://gfzpublic.gfz-potsdam.de/pubman/item/item_5015516 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic permafrost Thermokarst Siberia |
genre_facet |
Arctic permafrost Thermokarst Siberia |
op_source |
Global Change Biology |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1111/gcb.16649 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5015516 |
op_doi |
https://doi.org/10.1111/gcb.16649 |
container_title |
Global Change Biology |
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1766332145140236288 |