2018
DOI: 10.1080/20442041.2018.1500227
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Lateral variations and vertical structure of the microbial methane cycle in the sediment of Lake Onego (Russia)

Abstract: The significance of methane production by lakes to the global production of greenhouse gas is well acknowledged while underlying processes sustaining the lacustrine methane budget remain largely unknown. We coupled biogeochemical data to functional and phylogenetic analyses to understand how sedimentary parameters characterize the methane cycle vertically and horizontally in the icecovered bay of the second largest lake in Europe, Lake Onego, Russia. Our results support a heterogeneous winter methane cycle, wi… Show more

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Cited by 10 publications
(15 citation statements)
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References 105 publications
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“…[15] Thomas et al concentrated on the vertical structure of genes involved in methanogenesis, anaerobic and aerobic methane oxidations in the sediment of Lake Onego. [16] A comprehensive understanding of the whole ecological functions of microbial communities is still largely unknown.…”
Section: Introductionmentioning
confidence: 99%
“…[15] Thomas et al concentrated on the vertical structure of genes involved in methanogenesis, anaerobic and aerobic methane oxidations in the sediment of Lake Onego. [16] A comprehensive understanding of the whole ecological functions of microbial communities is still largely unknown.…”
Section: Introductionmentioning
confidence: 99%
“…The occurrence of the anaerobic methanotrophs Ca. Methanoperedens-related sequences suggests that the anaerobic oxidation of methane using nitrate as terminal electron acceptor via the reverse methanogenesis pathway [66] could take place in Lake Remoray, as previously described in other lakes [17,67]. Further studies, based both on pore-water chemistry and carbon isotopic signature of CH 4 , are needed to better estimate how different oxidation pathways contribute to methane emission mitigation.…”
Section: Spatial Heterogeneity Of Methane Production and Concentration Across Lake Remoraymentioning
confidence: 70%
“…Among the abiotic factors likely to affect the methane cycle, those that vary spatially and seasonally and with strati cation of the water column will de ne the location of the oxic/anoxic interface and in uence methanogenic and methanotrophic community diversity and activity rates [14][15][16][17]. Methane oxidation dynamics are in uenced by concentration of methane [18], oxygen [19][20][21] or nitrogen [21] and by methanotroph grazing by benthic invertebrates [22], whereas methanogenesis depends more on redox potential [23], quality and quantity of available OM [9], and temperature [20].…”
mentioning
confidence: 99%
“…In addition to CO 2 , methane is also produced, although to a lesser extent, in the anaerobic sediment of PB, even for the permanently oxic water column of Lake Onego. The observations by Thomas et al (2019) revealed that methane production and oxidation is stronger close to the RS mouth because of the organic matter inflow and subsequent sedimentation in the PB. Close to the river mouth, the largest numbers of the methane-related functional genes pmoA and mcrA were associated with a specific functional microbial community, and methane production exceeded oxidation, resulting in an order of magnitude higher methane fluxes than in the rest of the bay.…”
Section: Highlights From the Projectmentioning
confidence: 97%
“…Toward the open water, however, the methane cycling in the sediment is vertically structured, with aerobic methane oxidation at the sediment surface, followed below by anaerobic oxidation and finally methane formation underneath. This vertical pattern is the result of both the redox gradient and human-induced changes in organic inputs to the bay (Thomas et al 2019).…”
Section: Highlights From the Projectmentioning
confidence: 99%