[en] We investigated CH4 oxidation in the water column of Lake Kivu, a deep meromictic tropical lake with CH4-rich anoxic deep waters. Depth profiles of dissolved gases (CH4 and N2O) and a diversity of potential electron acceptors for anaerobic CH4 oxidation (NO3−, SO4 2−, Fe and Mn oxides) were determined during six field campaigns between June 2011 and August 2014. Denitrification measurements based on stable isotope labelling experiments were performed twice. In addition, we quantified aerobic and anaerobic CH4 oxidation, NO3− and SO4 2− consumption rates,with and without the presence of an inhibitor of SO4 2−-reducing bacteria activity. Aerobic CH4 production was also measured in parallel incubations with the addition of an inhibitor of aerobic CH4 oxidation. Themaximu m aerobic and anaerobic CH4 oxidation rates were estimated to be 27±2 and 16±8 μmol/L/d, respectively. We observed a difference in the relative importance of aerobic and anaerobic CH4 oxidation during the rainy and the dry season, with a greater role for aerobic oxidation during the dry season. Lower anaerobic CH4 oxidation rates were measured in presence of molybdate in half of the measurements, suggesting the occurrence of linkage between SO4 2− reduction and anaerobic CH4 oxidation. NO3− consumption and dissolved Mn production rates were never high enough to sustain themeasured anaerobic CH4 oxidation, reinforcing the idea of a coupling between SO4 2− reduction and CH4 oxidation in the anoxic waters of Lake Kivu. Finally, significant rates (up to 0.37 μmol/L/d) of pelagic CH4 production were also measured in oxygenated waters.
Research center :
FOCUS - Freshwater and OCeanic science Unit of reSearch - ULiège
Disciplines :
Aquatic sciences & oceanology
Author, co-author :
Roland, Fleur ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Chemical Oceanography Unit (AGO)
Morana, Cédric ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Chemical Oceanography Unit (AGO)
Darchambeau, François ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Chemical Oceanography Unit (AGO)
Crowe, Sean A.
Thamdrup, Bo
Descy, Jean-Pierre ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Chemical Oceanography Unit (AGO)
Borges, Alberto ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Chemical Oceanography Unit (AGO)
Language :
English
Title :
Anaerobic methane oxidation and aerobic methane production in an east African great lake (Lake Kivu)
Publication date :
31 December 2018
Journal title :
Journal of Great Lakes Research
ISSN :
0380-1330
eISSN :
2773-0719
Publisher :
International Association for Great Lakes Research
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