Methane cycling dynamics in sediments of Alaskan Arctic Foothill lakes
We measured aspects of sediment methane (CH4) cycling dynamics in 3 shallow (mean depth, z = 2.1 m) and 3 deep (z = 6.5 m) Alaskan Arctic Foothill lakes to establish reference data to evaluate future climate-mediated changes in these systems and to identify lake-size-dependent differences in rates a...
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Freshwater Biological Association
2013
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Online Access: | https://www.fba.org.uk/journals/index.php/IW/article/view/637 |
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ftfbaojs:oai:ojs.pkp.sfu.ca:article/637 |
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Open Polar |
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FBA Journal System (Freshwater Biological Association) |
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language |
English |
topic |
Arctic methane methane oxidation methanogenesis sediments |
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Arctic methane methane oxidation methanogenesis sediments Kristen A. Bretz Stephen C. Whalen Methane cycling dynamics in sediments of Alaskan Arctic Foothill lakes |
topic_facet |
Arctic methane methane oxidation methanogenesis sediments |
description |
We measured aspects of sediment methane (CH4) cycling dynamics in 3 shallow (mean depth, z = 2.1 m) and 3 deep (z = 6.5 m) Alaskan Arctic Foothill lakes to establish reference data to evaluate future climate-mediated changes in these systems and to identify lake-size-dependent differences in rates and controls on CH4 production and consumption or sensitivity to changing climate. The mean sedimentation rate and sediment oxygen (O2) penetration depth were significantly higher and lower, respectively, in shallow versus deep lakes. The molar carbon to nitrogen (C:N) ratio of 12 for sedimenting material across lakes indicated a dominance by phytodetritus. Pore water dissolved organic C and CH4 concentrations were higher in shallow than in deep lakes at comparable depths below the sediment surface. The average area-based rate of methanogenesis was significantly higher in shallow lakes, exceeding the mean of deep lakes by a factor of 4; however, the mean potential area-based rate of CH4 oxidation was comparable between lake classes due to the reduced sediment O2 penetration depth in shallow lakes. All lake sediments responded similarly to chemical amendments. Hydrogen addition significantly stimulated rates of methanogenesis relative to unamended controls, while rates were unchanged by alternate electron acceptors (SO42−, Fe3+, NO3−, Mn4+), suggesting that other microbial groups did not compete with methanogens for common substrates or produce toxic intermediates. Across all lakes, 30% of assimilated CH4 was converted to methanotophic biomass, and methanotrophic C production could be as much as 23% of epipelic primary production, pointing to the potential importance of CH4-derived C in Arctic lacustrine food webs. |
author2 |
U.S. National Science Foundation |
format |
Other/Unknown Material |
author |
Kristen A. Bretz Stephen C. Whalen |
author_facet |
Kristen A. Bretz Stephen C. Whalen |
author_sort |
Kristen A. Bretz |
title |
Methane cycling dynamics in sediments of Alaskan Arctic Foothill lakes |
title_short |
Methane cycling dynamics in sediments of Alaskan Arctic Foothill lakes |
title_full |
Methane cycling dynamics in sediments of Alaskan Arctic Foothill lakes |
title_fullStr |
Methane cycling dynamics in sediments of Alaskan Arctic Foothill lakes |
title_full_unstemmed |
Methane cycling dynamics in sediments of Alaskan Arctic Foothill lakes |
title_sort |
methane cycling dynamics in sediments of alaskan arctic foothill lakes |
publisher |
Freshwater Biological Association |
publishDate |
2013 |
url |
https://www.fba.org.uk/journals/index.php/IW/article/view/637 |
op_coverage |
Arctic |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
arctic methane Arctic |
genre_facet |
arctic methane Arctic |
op_source |
Inland Waters; Vol 4, No 1 (2014); 65-78 |
op_relation |
https://www.fba.org.uk/journals/index.php/IW/article/download/637/3660 https://www.fba.org.uk/journals/index.php/IW/article/download/637/3661 https://www.fba.org.uk/journals/index.php/IW/article/download/637/3662 https://www.fba.org.uk/journals/index.php/IW/article/download/637/3663 |
op_rights |
The submitting author (or their employer, if the author is not entitled to do so) will be required to check a box indicating that they have read, understood and accept the terms of this Copyright Notice. Author's declaration This article is submitted for publication in Inland Waters by me. I, the author (or his/her employer) confirm that: this article has not been published previously and it is not being considered for publication elsewhere, either in whole or substantial part; all persons entitled to authorship have been so included; all authors have read the submitted manuscript and approve its submission; the work conforms to the legal requirements of the country in which it was carried out, including those relating to conservation and welfare. Copyright to the above work (including all original text, photographs, images, tables and graphs*) is hereby transferred to the International Society of Limnology (SIL). I confirm that I have suitable rights to all content* and am legally permitted to transfer ownership to SIL. I accept responsibility for transferring copyright on behalf of any co-authors. * Excepting content for which I do not own the copyright but have obtained the necessary permission to reproduce. (Note: evidence of such permissions must be uploaded during step four of the submission process (Supplementary Files)). Rights of authors, publication, and permissions to reproduce The author retains the right to: display the submitted version of the manuscript (as first submitted to Inland Waters, prior to peer review), and/or the abstract only of the published article, on their personal/academic website(s); use (and permit others to use) the submitted version within their own organisation for non-commercial uses, e.g. for teaching purposes provided it is clearly stated that the manuscript is unpublished, and full bibliographic reference to the published article is given. Recommended text: Unpublished manuscript [if applicable]. The full text of this article |
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1766305316633313280 |
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ftfbaojs:oai:ojs.pkp.sfu.ca:article/637 2023-05-15T14:31:47+02:00 Methane cycling dynamics in sediments of Alaskan Arctic Foothill lakes Kristen A. Bretz Stephen C. Whalen U.S. National Science Foundation Arctic 2013-11-20 application/pdf https://www.fba.org.uk/journals/index.php/IW/article/view/637 en eng Freshwater Biological Association https://www.fba.org.uk/journals/index.php/IW/article/download/637/3660 https://www.fba.org.uk/journals/index.php/IW/article/download/637/3661 https://www.fba.org.uk/journals/index.php/IW/article/download/637/3662 https://www.fba.org.uk/journals/index.php/IW/article/download/637/3663 The submitting author (or their employer, if the author is not entitled to do so) will be required to check a box indicating that they have read, understood and accept the terms of this Copyright Notice. Author's declaration This article is submitted for publication in Inland Waters by me. I, the author (or his/her employer) confirm that: this article has not been published previously and it is not being considered for publication elsewhere, either in whole or substantial part; all persons entitled to authorship have been so included; all authors have read the submitted manuscript and approve its submission; the work conforms to the legal requirements of the country in which it was carried out, including those relating to conservation and welfare. Copyright to the above work (including all original text, photographs, images, tables and graphs*) is hereby transferred to the International Society of Limnology (SIL). I confirm that I have suitable rights to all content* and am legally permitted to transfer ownership to SIL. I accept responsibility for transferring copyright on behalf of any co-authors. * Excepting content for which I do not own the copyright but have obtained the necessary permission to reproduce. (Note: evidence of such permissions must be uploaded during step four of the submission process (Supplementary Files)). Rights of authors, publication, and permissions to reproduce The author retains the right to: display the submitted version of the manuscript (as first submitted to Inland Waters, prior to peer review), and/or the abstract only of the published article, on their personal/academic website(s); use (and permit others to use) the submitted version within their own organisation for non-commercial uses, e.g. for teaching purposes provided it is clearly stated that the manuscript is unpublished, and full bibliographic reference to the published article is given. Recommended text: Unpublished manuscript [if applicable]. The full text of this article Inland Waters; Vol 4, No 1 (2014); 65-78 Arctic methane methane oxidation methanogenesis sediments Field/laboratory study 2013 ftfbaojs 2019-09-01T07:51:02Z We measured aspects of sediment methane (CH4) cycling dynamics in 3 shallow (mean depth, z = 2.1 m) and 3 deep (z = 6.5 m) Alaskan Arctic Foothill lakes to establish reference data to evaluate future climate-mediated changes in these systems and to identify lake-size-dependent differences in rates and controls on CH4 production and consumption or sensitivity to changing climate. The mean sedimentation rate and sediment oxygen (O2) penetration depth were significantly higher and lower, respectively, in shallow versus deep lakes. The molar carbon to nitrogen (C:N) ratio of 12 for sedimenting material across lakes indicated a dominance by phytodetritus. Pore water dissolved organic C and CH4 concentrations were higher in shallow than in deep lakes at comparable depths below the sediment surface. The average area-based rate of methanogenesis was significantly higher in shallow lakes, exceeding the mean of deep lakes by a factor of 4; however, the mean potential area-based rate of CH4 oxidation was comparable between lake classes due to the reduced sediment O2 penetration depth in shallow lakes. All lake sediments responded similarly to chemical amendments. Hydrogen addition significantly stimulated rates of methanogenesis relative to unamended controls, while rates were unchanged by alternate electron acceptors (SO42−, Fe3+, NO3−, Mn4+), suggesting that other microbial groups did not compete with methanogens for common substrates or produce toxic intermediates. Across all lakes, 30% of assimilated CH4 was converted to methanotophic biomass, and methanotrophic C production could be as much as 23% of epipelic primary production, pointing to the potential importance of CH4-derived C in Arctic lacustrine food webs. Other/Unknown Material arctic methane Arctic FBA Journal System (Freshwater Biological Association) Arctic |