Methane cycling in the sediment and water column of mid-boreal hyper-eutrophic Lake Kevätön, Finland

Liikanen, Anu; Huttunen, Jari T.; Valli, Kaisa; Martikainen, Pertti J.

doi:10.1127/archiv-hydrobiol/154/2002/585

Cited by 51 publications

(61 citation statements)

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“…To the best of our knowledge, the highest K S-CH 4 reported in lakes is 0.704 mg L −1 (Liikanen et al, 2002). It should be noted that these reported K S values refer to the apparent affinity constants for the methanotrophic community, rather than the half-saturation constant for the CH 4 monooxygenase enzyme that catalyzes CH 4 oxidation.…”

Section: Dissolved Ch 4 Concentration and Mo Ratementioning

confidence: 98%

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Geographic and seasonal variation of dissolved methane and aerobic methane oxidation in Alaskan lakes

et al. 2015

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Abstract. 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.

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Section: Dissolved Ch 4 Concentration and Mo Ratementioning

confidence: 98%

“…Average K S-CH 4 and K S-O 2 values for lakes have been determined by previous studies: Liikanen et al, 2002;Lofton et al, 2014) and Lidstrom and Somers, 1984;Frenzel et al, 1990). To the best of our knowledge, the highest K S-CH 4 reported in lakes is 0.704 mg L −1 (Liikanen et al, 2002).…”

Section: Dissolved Ch 4 Concentration and Mo Ratementioning

confidence: 99%

Geographic and seasonal variation of dissolved methane and aerobic methane oxidation in Alaskan lakes

et al. 2015

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“…As such, it has been estimated that 20-59% of the OM delivered to sediments via suspended particles is converted to methane (Wetzel, 2001 and references therein). However, a large fraction (30-99%) of methane produced in aquatic systems can be converted to CO 2 via microbial CH 4 oxidation in the water column prior to being evaded to the atmosphere (Liikanen et al, 2002;Kankaala et al, 2006;Bastviken et al, 2008). For example, in the Amazon River it has been estimated that CH 4 emissions are reduced by as much as 96% due to oxidation .…”

Section: Methane Cycling In Inland Watersmentioning

confidence: 99%

Where Carbon Goes When Water Flows: Carbon Cycling across the Aquatic Continuum

et al. 2017

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The purpose of this review is to highlight progress in unraveling carbon cycling dynamics across the continuum of landscapes, inland waters, coastal oceans, and the atmosphere. Earth systems are intimately interconnected, yet most biogeochemical studies focus on specific components in isolation. The movement of water drives the carbon cycle, and, as such, inland waters provide a critical intersection between terrestrial and marine biospheres. Inland, estuarine, and coastal waters are well studied in regions near centers of human population in the Northern hemisphere. However, many of the world's large river systems and their marine receiving waters remain poorly characterized, particularly in the tropics, which contribute to a disproportionately large fraction of the transformation of terrestrial organic matter to carbon dioxide, and the Arctic, where positive feedback mechanisms are likely to amplify global climate change. There are large gaps in current coverage of environmental observations along the aquatic continuum. For example, tidally-influenced reaches of major rivers and near-shore coastal regions around river plumes are often left out of carbon budgets due to a combination of methodological constraints and poor data coverage. We suggest that closing these gaps could potentially alter global estimates of CO 2 outgassing from surface waters to the atmosphere by several-fold. Finally, in order to identify and constrain/embrace uncertainties in global carbon budget estimations it is important that we further adopt statistical and modeling approaches that have become well-established in the fields of oceanography and paleoclimatology, for example.

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“…In such environments, the maximum methane concentration has been recorded in bottom water and the highest methane oxidation has been observed in the oxicanoxic boundary in the metalimnion (Kiene 1991) and even in the apparently anoxic deep water (Kiene 1991;Bastviken et al 2002;Liikanen et al 2002). On the other hand, surface water contains much less dissolved methane and shows low methane oxidizing activity compared with deeper layers.…”

mentioning

confidence: 98%

Inhibitory effect of light on methane oxidation in the pelagic water column of a mesotrophic lake (Lake Biwa, Japan)

Murase

Sugimoto

2005

Limnol. Oceanogr.

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Methane oxidation was studied in mesotrophic lake water (Lake Biwa, Japan) under thermally stratified conditions. Methane oxidation rates at in situ concentrations were very low in lake water from the epilimnion and thermocline but were high in hypolimnetic water. Incubation under light conditions ranging from 4.1 to 57 µmol photons m−2 s−1 resulted in decreased methane oxidation in hypolimnetic water. This inhibition was more severe as the light intensity increased. Addition of inorganic nitrogen (ammonium and nitrate) did not promote methane oxidation in the thermocline but inhibited it in the hypolimnion. Methane oxidation activity in the thermocline was observed after 1 month of incubation under dark conditions. Our results suggest that the inhibitory effect of light was bacteriostatic for the methanotrophic population. The different rates of methane oxidation between the hypolimnion and epilimnion/thermocline may explain the surface maximum of dissolved methane during the period of thermal stratification.

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Methane cycling in the sediment and water column of mid-boreal hyper-eutrophic Lake Kevätön, Finland

Cited by 51 publications

References 0 publications

Geographic and seasonal variation of dissolved methane and aerobic methane oxidation in Alaskan lakes

Geographic and seasonal variation of dissolved methane and aerobic methane oxidation in Alaskan lakes

Where Carbon Goes When Water Flows: Carbon Cycling across the Aquatic Continuum

Inhibitory effect of light on methane oxidation in the pelagic water column of a mesotrophic lake (Lake Biwa, Japan)

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