Rates and pathways of CH4 oxidation in ferruginous Lake Matano, Indonesia
- 1Department of Geology, University of Kansas, Lawrence KS 66047, USA
- 2Department of Microbiology and Immunology and Department of Earth, Ocean, and Atmospheric Sciences, University of British Columbia, 2350 Health Sciences Mall, Vancouver, British Columbia V6T 1Z3, Canada
- 3Research Center for Limnology, Indonesian Institute of Sciences (LIPI), Cibinong-Bogor, Indonesia
- 4Nordic Center for Earth Evolution, Institute of Biology, Univ. of Southern Denmark, Campusvej 55, 5230 Odense, Denmark
- 1Department of Geology, University of Kansas, Lawrence KS 66047, USA
- 2Department of Microbiology and Immunology and Department of Earth, Ocean, and Atmospheric Sciences, University of British Columbia, 2350 Health Sciences Mall, Vancouver, British Columbia V6T 1Z3, Canada
- 3Research Center for Limnology, Indonesian Institute of Sciences (LIPI), Cibinong-Bogor, Indonesia
- 4Nordic Center for Earth Evolution, Institute of Biology, Univ. of Southern Denmark, Campusvej 55, 5230 Odense, Denmark
Abstract. This study evaluates rates and pathways of methane (CH4) oxidation and uptake using 14C-based tracer experiments throughout the oxic and anoxic waters of ferruginous Lake Matano. Methane oxidation rates in Lake Matano are low compared to other lakes, but are sufficiently high to preclude strong CH4 fluxes to the atmosphere. In addition to aerobic CH4 oxidation, which takes place in Lake Matano's oxic mixolimnion, we also detected CH4 oxidation in Lake Matano's anoxic ferruginous waters. Here, CH4 oxidation proceeds in the apparent absence of oxygen (O2) and instead appears to be coupled to nitrate (NO3−), nitrite (NO2−), iron (Fe), or manganese (Mn) reduction. Throughout the lake, the fraction of CH4 carbon that is assimilated vs. oxidized to carbon dioxide (CO2) is high, indicating extensive CH4 conversion to biomass and underscoring the importance of CH4 as a carbon and energy source in Lake Matano and potentially other ferruginous or low productivity environments.
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A. Sturm et al.


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RC1: 'Review of manuscript "Rates and pathways of CH4 oxidation in ferruginous Lake Matano, Indonesia"', Anonymous Referee #1, 04 Apr 2016
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RC2: 'Review comments', Anonymous Referee #2, 13 Apr 2016
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RC3: 'Referee comments', Anonymous Referee #3, 15 Apr 2016


-
RC1: 'Review of manuscript "Rates and pathways of CH4 oxidation in ferruginous Lake Matano, Indonesia"', Anonymous Referee #1, 04 Apr 2016
-
RC2: 'Review comments', Anonymous Referee #2, 13 Apr 2016
-
RC3: 'Referee comments', Anonymous Referee #3, 15 Apr 2016
A. Sturm et al.
A. Sturm et al.
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