Geographic and seasonal variation of dissolved methane and aerobic methane oxidation in Alaskan lakes
Methanotrophic bacteria play an important role oxidizing a significant fraction of methane (CH 4 ) produced in lakes. Aerobic CH 4 oxidation depends mainly on lake CH 4 and oxygen (O 2 ) concentrations, in such a manner that higher MO rates are usually found at the oxic/anoxic interface, where both...
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ftdoajarticles:oai:doaj.org/article:1fca175beddd4956bd1d11fda97718c3 2023-05-15T17:56:50+02:00 Geographic and seasonal variation of dissolved methane and aerobic methane oxidation in Alaskan lakes K. Martinez-Cruz A. Sepulveda-Jauregui K. Walter Anthony F. Thalasso 2015-08-01T00:00:00Z https://doi.org/10.5194/bg-12-4595-2015 https://doaj.org/article/1fca175beddd4956bd1d11fda97718c3 EN eng Copernicus Publications http://www.biogeosciences.net/12/4595/2015/bg-12-4595-2015.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 1726-4170 1726-4189 doi:10.5194/bg-12-4595-2015 https://doaj.org/article/1fca175beddd4956bd1d11fda97718c3 Biogeosciences, Vol 12, Iss 15, Pp 4595-4606 (2015) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2015 ftdoajarticles https://doi.org/10.5194/bg-12-4595-2015 2022-12-31T09:20:45Z Methanotrophic bacteria play an important role oxidizing a significant fraction of methane (CH 4 ) produced in lakes. Aerobic CH 4 oxidation depends mainly on lake CH 4 and oxygen (O 2 ) concentrations, in such a manner that higher MO rates are usually found at the oxic/anoxic interface, where both molecules are present. MO also depends on temperature, and via methanogenesis, on organic carbon input to lakes, including from thawing permafrost in thermokarst (thaw)-affected lakes. Given the large variability in these environmental factors, CH 4 oxidation is expected to be subject to large seasonal and geographic variations, which have been scarcely reported in the literature. In the present study, we measured CH 4 oxidation rates in 30 Alaskan lakes along a north-south latitudinal transect during winter and summer with a new field laser spectroscopy method. Additionally, we measured dissolved CH 4 and O 2 concentrations. We found that in the winter, aerobic CH 4 oxidation was mainly controlled by the dissolved O 2 concentration, while in the summer it was controlled primarily by the CH 4 concentration, which was scarce compared to dissolved O 2 . The permafrost environment of the lakes was identified as another key factor. Thermokarst (thaw) lakes formed in yedoma-type permafrost had significantly higher CH 4 oxidation rates compared to other thermokarst and non-thermokarst lakes formed in non-yedoma permafrost environments. As thermokarst lakes formed in yedoma-type permafrost have been identified to receive large quantities of terrestrial organic carbon from thaw and subsidence of the surrounding landscape into the lake, confirming the strong coupling between terrestrial and aquatic habitats and its influence on CH 4 cycling. Article in Journal/Newspaper permafrost Thermokarst Directory of Open Access Journals: DOAJ Articles Biogeosciences 12 15 4595 4606 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
language |
English |
topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
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Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 K. Martinez-Cruz A. Sepulveda-Jauregui K. Walter Anthony F. Thalasso Geographic and seasonal variation of dissolved methane and aerobic methane oxidation in Alaskan lakes |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
Methanotrophic bacteria play an important role oxidizing a significant fraction of methane (CH 4 ) produced in lakes. Aerobic CH 4 oxidation depends mainly on lake CH 4 and oxygen (O 2 ) concentrations, in such a manner that higher MO rates are usually found at the oxic/anoxic interface, where both molecules are present. MO also depends on temperature, and via methanogenesis, on organic carbon input to lakes, including from thawing permafrost in thermokarst (thaw)-affected lakes. Given the large variability in these environmental factors, CH 4 oxidation is expected to be subject to large seasonal and geographic variations, which have been scarcely reported in the literature. In the present study, we measured CH 4 oxidation rates in 30 Alaskan lakes along a north-south latitudinal transect during winter and summer with a new field laser spectroscopy method. Additionally, we measured dissolved CH 4 and O 2 concentrations. We found that in the winter, aerobic CH 4 oxidation was mainly controlled by the dissolved O 2 concentration, while in the summer it was controlled primarily by the CH 4 concentration, which was scarce compared to dissolved O 2 . The permafrost environment of the lakes was identified as another key factor. Thermokarst (thaw) lakes formed in yedoma-type permafrost had significantly higher CH 4 oxidation rates compared to other thermokarst and non-thermokarst lakes formed in non-yedoma permafrost environments. As thermokarst lakes formed in yedoma-type permafrost have been identified to receive large quantities of terrestrial organic carbon from thaw and subsidence of the surrounding landscape into the lake, confirming the strong coupling between terrestrial and aquatic habitats and its influence on CH 4 cycling. |
format |
Article in Journal/Newspaper |
author |
K. Martinez-Cruz A. Sepulveda-Jauregui K. Walter Anthony F. Thalasso |
author_facet |
K. Martinez-Cruz A. Sepulveda-Jauregui K. Walter Anthony F. Thalasso |
author_sort |
K. Martinez-Cruz |
title |
Geographic and seasonal variation of dissolved methane and aerobic methane oxidation in Alaskan lakes |
title_short |
Geographic and seasonal variation of dissolved methane and aerobic methane oxidation in Alaskan lakes |
title_full |
Geographic and seasonal variation of dissolved methane and aerobic methane oxidation in Alaskan lakes |
title_fullStr |
Geographic and seasonal variation of dissolved methane and aerobic methane oxidation in Alaskan lakes |
title_full_unstemmed |
Geographic and seasonal variation of dissolved methane and aerobic methane oxidation in Alaskan lakes |
title_sort |
geographic and seasonal variation of dissolved methane and aerobic methane oxidation in alaskan lakes |
publisher |
Copernicus Publications |
publishDate |
2015 |
url |
https://doi.org/10.5194/bg-12-4595-2015 https://doaj.org/article/1fca175beddd4956bd1d11fda97718c3 |
genre |
permafrost Thermokarst |
genre_facet |
permafrost Thermokarst |
op_source |
Biogeosciences, Vol 12, Iss 15, Pp 4595-4606 (2015) |
op_relation |
http://www.biogeosciences.net/12/4595/2015/bg-12-4595-2015.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 1726-4170 1726-4189 doi:10.5194/bg-12-4595-2015 https://doaj.org/article/1fca175beddd4956bd1d11fda97718c3 |
op_doi |
https://doi.org/10.5194/bg-12-4595-2015 |
container_title |
Biogeosciences |
container_volume |
12 |
container_issue |
15 |
container_start_page |
4595 |
op_container_end_page |
4606 |
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1766165133387628544 |