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Seppey CVW, Cabrol L, Thalasso F, Gandois L, Lavergne C, Martinez-Cruz K, Sepulveda-Jauregui A, Aguilar-Muñoz P, Astorga-España MS, Chamy R, Dellagnezze BM, Etchebehere C, Fochesatto GJ, Gerardo-Nieto O, Mansilla A, Murray A, Sweetlove M, Tananaev N, Teisserenc R, Tveit AT, Van de Putte A, Svenning MM, Barret M. Biogeography of microbial communities in high-latitude ecosystems: Contrasting drivers for methanogens, methanotrophs and global prokaryotes. Environ Microbiol 2023; 25:3364-3386. [PMID: 37897125 DOI: 10.1111/1462-2920.16526] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2023] [Accepted: 10/02/2023] [Indexed: 10/29/2023]
Abstract
Methane-cycling is becoming more important in high-latitude ecosystems as global warming makes permafrost organic carbon increasingly available. We explored 387 samples from three high-latitudes regions (Siberia, Alaska and Patagonia) focusing on mineral/organic soils (wetlands, peatlands, forest), lake/pond sediment and water. Physicochemical, climatic and geographic variables were integrated with 16S rDNA amplicon sequences to determine the structure of the overall microbial communities and of specific methanogenic and methanotrophic guilds. Physicochemistry (especially pH) explained the largest proportion of variation in guild composition, confirming species sorting (i.e., environmental filtering) as a key mechanism in microbial assembly. Geographic distance impacted more strongly beta diversity for (i) methanogens and methanotrophs than the overall prokaryotes and, (ii) the sediment habitat, suggesting that dispersal limitation contributed to shape the communities of methane-cycling microorganisms. Bioindicator taxa characterising different ecological niches (i.e., specific combinations of geographic, climatic and physicochemical variables) were identified, highlighting the importance of Methanoregula as generalist methanogens. Methylocystis and Methylocapsa were key methanotrophs in low pH niches while Methylobacter and Methylomonadaceae in neutral environments. This work gives insight into the present and projected distribution of methane-cycling microbes at high latitudes under climate change predictions, which is crucial for constraining their impact on greenhouse gas budgets.
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Affiliation(s)
- Christophe V W Seppey
- Department of Arctic and Marine Biology, UiT The Arctic University of Norway, Tromsø, Norway
- Institute of Environmental Science and Geography, University of Potsdam, Potsdam-Golm, Germany
| | - Léa Cabrol
- Aix-Marseille University, CNRS, IRD, Mediterranean Institute of Oceanography (MIO) UM 110, Marseille, France
- Millennium Institute Biodiversity of Antarctic and Subantarctic Ecosystems (BASE), Santiago, Chile
| | - Frederic Thalasso
- Centro de Investigacíon y de Estudios Avanzados del Instituto Politecnico Nacional (Cinvestav-IPN), Departamento de Biotecnología y Bioingeniería, México, Mexico
| | - Laure Gandois
- Laboratoire Écologie Fonctionnelle et Environnement, Université de Toulouse, CNRS, Toulouse, France
| | - Céline Lavergne
- HUB AMBIENTAL UPLA, Laboratory of Aquatic Environmental Research, Universidad de Playa Ancha, Valparaíso, Chile
- Escuela de Ingeniería Bioquímica, Pontificia Universidad Católica de Valparaíso, Valparaíso, Chile
| | - Karla Martinez-Cruz
- Departamento de Ciencias y Recursos Naturales, Universidad de Magallanes, Punta Arenas, Chile
- Environmental Physics Group, Limnological Institute, University of Konstanz, Konstanz, Germany
| | | | - Polette Aguilar-Muñoz
- HUB AMBIENTAL UPLA, Laboratory of Aquatic Environmental Research, Universidad de Playa Ancha, Valparaíso, Chile
- Escuela de Ingeniería Bioquímica, Pontificia Universidad Católica de Valparaíso, Valparaíso, Chile
| | | | - Rolando Chamy
- Escuela de Ingeniería Bioquímica, Pontificia Universidad Católica de Valparaíso, Valparaíso, Chile
| | - Bruna Martins Dellagnezze
- Microbial Ecology Laboratory, Department of Microbial Biochemistry and Genomic, Biological Research Institute "Clemente Estable", Montevideo, Uruguay
| | - Claudia Etchebehere
- Microbial Ecology Laboratory, Department of Microbial Biochemistry and Genomic, Biological Research Institute "Clemente Estable", Montevideo, Uruguay
| | - Gilberto J Fochesatto
- Department of Atmospheric Sciences, University of Alaska Fairbanks, Fairbanks, Alaska, USA
| | - Oscar Gerardo-Nieto
- Centro de Investigacíon y de Estudios Avanzados del Instituto Politecnico Nacional (Cinvestav-IPN), Departamento de Biotecnología y Bioingeniería, México, Mexico
| | - Andrés Mansilla
- Departamento de Ciencias y Recursos Naturales, Universidad de Magallanes, Punta Arenas, Chile
| | - Alison Murray
- Division of Earth and Ecosystem Sciences, Desert Research Institute, Reno, Nevada, USA
| | - Maxime Sweetlove
- Royal Belgian Institute for Natural Sciences, OD-Nature, Brussels, Belgium
| | - Nikita Tananaev
- Melnikov Permafrost Institute, Russian Academy of Sciences, Yakutsk, Russia
- Institute of Natural Sciences, North-Eastern Federal University, Yakutsk, Russia
| | - Roman Teisserenc
- Laboratoire Écologie Fonctionnelle et Environnement, Université de Toulouse, CNRS, Toulouse, France
| | - Alexander T Tveit
- Department of Arctic and Marine Biology, UiT The Arctic University of Norway, Tromsø, Norway
| | - Anton Van de Putte
- Royal Belgian Institute for Natural Sciences, OD-Nature, Brussels, Belgium
| | - Mette M Svenning
- Department of Arctic and Marine Biology, UiT The Arctic University of Norway, Tromsø, Norway
| | - Maialen Barret
- Laboratoire Écologie Fonctionnelle et Environnement, Université de Toulouse, CNRS, Toulouse, France
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Barret M, Gandois L, Thalasso F, Martinez Cruz K, Sepulveda Jauregui A, Lavergne C, Teisserenc R, Aguilar P, Gerardo Nieto O, Etchebehere C, Martins Dellagnezze B, Bovio Winkler P, Fochesatto GJ, Tananaev N, Svenning MM, Seppey C, Tveit A, Chamy R, Astorga España MS, Mansilla A, Van de Putte A, Sweetlove M, Murray AE, Cabrol L. A combined microbial and biogeochemical dataset from high-latitude ecosystems with respect to methane cycle. Sci Data 2022; 9:674. [PMID: 36333353 PMCID: PMC9636175 DOI: 10.1038/s41597-022-01759-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2022] [Accepted: 10/04/2022] [Indexed: 11/06/2022] Open
Abstract
High latitudes are experiencing intense ecosystem changes with climate warming. The underlying methane (CH4) cycling dynamics remain unresolved, despite its crucial climatic feedback. Atmospheric CH4 emissions are heterogeneous, resulting from local geochemical drivers, global climatic factors, and microbial production/consumption balance. Holistic studies are mandatory to capture CH4 cycling complexity. Here, we report a large set of integrated microbial and biogeochemical data from 387 samples, using a concerted sampling strategy and experimental protocols. The study followed international standards to ensure inter-comparisons of data amongst three high-latitude regions: Alaska, Siberia, and Patagonia. The dataset encompasses different representative environmental features (e.g. lake, wetland, tundra, forest soil) of these high-latitude sites and their respective heterogeneity (e.g. characteristic microtopographic patterns). The data included physicochemical parameters, greenhouse gas concentrations and emissions, organic matter characterization, trace elements and nutrients, isotopes, microbial quantification and composition. This dataset addresses the need for a robust physicochemical framework to conduct and contextualize future research on the interactions between climate change, biogeochemical cycles and microbial communities at high-latitudes. Measurement(s) | microbial diversity • microbial abundances • cations and anions • trace elements | Technology Type(s) | MiSeq sequencing 16S rRNA gene • Real Time PCR • HPLC • ICP-MS | Sample Characteristic - Organism | bacteria • archaea | Sample Characteristic - Environment | lake water • lake sediment • wetland • peatland • soil • pond | Sample Characteristic - Location | Western Siberia • Alaska • Patagonia • Cape Horn province • Magellanic subantarctic ecoregion |
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3
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Essert V, Masclaux H, Verneaux V, Millet L. Influence of thermal regime, oxygen conditions and land use on source and pathways of carbon in lake pelagic food webs. ECOSCIENCE 2022. [DOI: 10.1080/11956860.2022.2094630] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- Valentin Essert
- Université Bourgogne Franche-Comté, UMR CNRS 6249, Laboratoire Chrono-Environnement, Besançon, France
| | - Hélène Masclaux
- Université Bourgogne Franche-Comté, UMR CNRS 6249, Laboratoire Chrono-Environnement, Besançon, France
| | - Valérie Verneaux
- Université Bourgogne Franche-Comté, UMR CNRS 6249, Laboratoire Chrono-Environnement, Besançon, France
| | - Laurent Millet
- Université Bourgogne Franche-Comté, UMR CNRS 6249, Laboratoire Chrono-Environnement, Besançon, France
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Pellerin A, Lotem N, Walter Anthony K, Eliani Russak E, Hasson N, Røy H, Chanton JP, Sivan O. Methane production controls in a young thermokarst lake formed by abrupt permafrost thaw. GLOBAL CHANGE BIOLOGY 2022; 28:3206-3221. [PMID: 35243729 PMCID: PMC9310722 DOI: 10.1111/gcb.16151] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2021] [Revised: 12/21/2021] [Accepted: 02/11/2022] [Indexed: 06/01/2023]
Abstract
Methane (CH4 ) release to the atmosphere from thawing permafrost contributes significantly to global CH4 emissions. However, constraining the effects of thaw that control the production and emission of CH4 is needed to anticipate future Arctic emissions. Here are presented robust rate measurements of CH4 production and cycling in a region of rapidly degrading permafrost. Big Trail Lake, located in central Alaska, is a young, actively expanding thermokarst lake. The lake was investigated by taking two 1 m cores of sediment from different regions. Two independent methods of measuring microbial CH4 production, long term (CH4 accumulation) and short term (14 C tracer), produced similar average rates of 11 ± 3.5 and 9 ± 3.6 nmol cm-3 d-1 , respectively. The rates had small variations between the different lithological units, indicating homogeneous CH4 production despite heterogeneous lithology in the surface ~1 m of sediment. To estimate the total CH4 production, the CH4 production rates were multiplied through the 10-15 m deep talik (thaw bulb). This estimate suggests that CH4 production is higher than emission by a maximum factor of ~2, which is less than previous estimates. Stable and radioactive carbon isotope measurements showed that 50% of dissolved CH4 in the first meter was produced further below. Interestingly, labeled 14 C incubations with 2-14 C acetate and 14 C CO2 indicate that variations in the pathway used by microbes to produce CH4 depends on the age and type of organic matter in the sediment, but did not appear to influence the rates at which CH4 was produced. This study demonstrates that at least half of the CH4 produced by microbial breakdown of organic matter in actively expanding thermokarst is emitted to the atmosphere, and that the majority of this CH4 is produced in the deep sediment.
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Affiliation(s)
- André Pellerin
- Department of Earth and Environmental SciencesBen Gurion University of the NegevBeershevaIsrael
| | - Noam Lotem
- Department of Earth and Environmental SciencesBen Gurion University of the NegevBeershevaIsrael
| | - Katey Walter Anthony
- Water and Environmental Research CenterUniversity of Alaska FairbanksFairbanksAlaskaUSA
- International Arctic Research CenterFairbanksAlaskaUSA
| | - Efrat Eliani Russak
- Department of Earth and Environmental SciencesBen Gurion University of the NegevBeershevaIsrael
| | - Nicholas Hasson
- Water and Environmental Research CenterUniversity of Alaska FairbanksFairbanksAlaskaUSA
| | - Hans Røy
- Department of BiologyAarhus UniversityAarhusDenmark
| | - Jeffrey P. Chanton
- Department of Earth Ocean and Atmospheric ScienceFlorida State UniversityTallahasseeFloridaUSA
| | - Orit Sivan
- Department of Earth and Environmental SciencesBen Gurion University of the NegevBeershevaIsrael
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Biogeochemistry of Mediterranean Wetlands: A Review about the Effects of Water-Level Fluctuations on Phosphorus Cycling and Greenhouse Gas Emissions. WATER 2021. [DOI: 10.3390/w13111510] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Although Mediterranean wetlands are characterized by extreme natural water level fluctuations in response to irregular precipitation patterns, global climate change is expected to amplify this pattern by shortening precipitation seasons and increasing the incidence of summer droughts in this area. As a consequence, a part of the lake sediment will be exposed to air-drying in dry years when the water table becomes low. This periodic sediment exposure to dry/wet cycles will likely affect biogeochemical processes. Unexpectedly, to date, few studies are focused on assessing the effects of water level fluctuations on the biogeochemistry of these ecosystems. In this review, we investigate the potential impacts of water level fluctuations on phosphorus dynamics and on greenhouse gases emissions in Mediterranean wetlands. Major drivers of global change, and specially water level fluctuations, will lead to the degradation of water quality in Mediterranean wetlands by increasing the availability of phosphorus concentration in the water column upon rewetting of dry sediment. CO2 fluxes are likely to be enhanced during desiccation, while inundation is likely to decrease cumulative CO2 emissions, as well as N2O emissions, although increasing CH4 emissions. However, there exists a complete gap of knowledge about the net effect of water level fluctuations induced by global change on greenhouse gases emission. Accordingly, further research is needed to assess whether the periodic exposure to dry–wet cycles, considering the extent and frequency of the cycles, will amplify the role of these especial ecosystems as a source of these gases and thereby act as a feedback mechanism for global warming. To conclude, it is pertinent to consider that a better understanding about the effect of water level fluctuations on the biogeochemistry of Mediterranean wetlands will help to predict how other freshwater ecosystems will respond.
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Aguirrezabala-Campano T, Gonzalez-Valencia R, Cervantes FJ, Thalasso F. Overall spatiotemporal dynamics of greenhouse gasses and oxygen in two subtropical reservoirs with contrasting trophic states. WATER RESEARCH 2021; 196:117056. [PMID: 33774352 DOI: 10.1016/j.watres.2021.117056] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2020] [Revised: 03/08/2021] [Accepted: 03/15/2021] [Indexed: 06/12/2023]
Abstract
The impact of cultural eutrophication on carbon cycling in subtropical reservoirs was assessed using high-resolution measurements of dissolved gas concentration, atmospheric exchange, and uptake/production rates of methane, carbon dioxide, and oxygen. Seasonal measurements were performed in two reservoirs that pertain to the same hydrological basin but are drastically different in terms of allochthonous carbon input. These results were used to feed a mass balance model, from which a large number of overall parameters were determined to explicitly describe the dynamics and spatial attributes of the carbon cycle in the reservoirs. A single graphical representation of each reservoir was created to facilitate an overall appraisal of the carbon cycle. The impact of cultural eutrophication was profound and resulted in a complete redistribution of how the various bioprocesses participated in the methane, carbon dioxide, and oxygen cycles. Among several identified impacts of eutrophication, it was observed that while eutrophication triggered increased methane production, this effect was followed by a similar increase in methane emissions and methanotrophic rates, while gross primary production was depleted.
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Affiliation(s)
- Teresa Aguirrezabala-Campano
- Department of Biotechnology and Bioengineering, Cinvestav, Avenida IPN 2508, Mexico City, San Pedro Zacatenco, 07360, Mexico
| | - Rodrigo Gonzalez-Valencia
- Department of Biotechnology and Bioengineering, Cinvestav, Avenida IPN 2508, Mexico City, San Pedro Zacatenco, 07360, Mexico
| | - Francisco J Cervantes
- Laboratory for Research on Advanced Processes for Water Treatment, Engineering Institute, Campus Juriquilla, Universidad Nacional Autónoma de México, Blvd. Juriquilla 3001, Querétaro, 76230, Mexico
| | - Frédéric Thalasso
- Department of Biotechnology and Bioengineering, Cinvestav, Avenida IPN 2508, Mexico City, San Pedro Zacatenco, 07360, Mexico.
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Manasypov RM, Pokrovsky OS, Shirokova LS, Auda Y, Zinner NS, Vorobyev SN, Kirpotin SN. Biogeochemistry of macrophytes, sediments and porewaters in thermokarst lakes of permafrost peatlands, western Siberia. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 763:144201. [PMID: 33385841 DOI: 10.1016/j.scitotenv.2020.144201] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2020] [Revised: 10/22/2020] [Accepted: 11/27/2020] [Indexed: 05/20/2023]
Abstract
The chemical composition of thermokarst lake ecosystem components is a crucial indicator of current climate change and permafrost thaw. Despite high importance of macrophytes in shallow permafrost thaw lakes for control of major and trace nutrients in lake water, the trace element (TE) partitioning between macrophytes and lake water and sediments in the permafrost regions remains virtually unknown. Here we sampled dominant macrophytes in thermokarst lakes of discontinuous and continuous permafrost zones in the Western Siberia Lowland (WSL) and measured major and trace elements in plant biomass, lake water, lake sediments and sediment porewater. All six plant species (Hippuris vulgaris L., Glyceria maxima (Hartm.) Holmb., Comarum palustre L., Ranunculus spitzbergensis Hadac, Carex aquatilis Wahlenb s. str., Menyanthes trifoliata L.) sizably accumulated macronutrients (Na, Mg, Ca), micronutrients (B, Mo, Nu, Cu, Zn, Co) and toxicants (As, Cd). Accumulation of other trace elements, including rare earth elements (REE), in macrophytes relative to pore waters and sediments was highly variable among species. Using miltiparametric statistics, we described the behavior of ТЕ across two permafrost zones and identified several group of elements depending on their sources in the lake ecosystems and their affinity to sediments and macrophytes. Under future climate warming and shifting the permafrost border to the north, we anticipate an increasing uptake of heavy metals and lithogenic low mobile elements such as Ti, Al, Cr, As, Cu, Fe, Ni, Ga, Zr, and REEs by macrophytes in the discontinuous permafrost zone and Ba, Zn, Pb and Cd in the continuous permafrost zone. This may eventually diminish transport of metal micronutrients and geochemical tracers from soils to lakes and rivers and further to the Arctic Ocean.
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Affiliation(s)
- Rinat M Manasypov
- BIO-GEO-CLIM Laboratory, Tomsk State University, 36 av. Lenina, 634050 Tomsk, Russia.
| | - Oleg S Pokrovsky
- BIO-GEO-CLIM Laboratory, Tomsk State University, 36 av. Lenina, 634050 Tomsk, Russia; Federal Center for Integrated Arctic Research, Institute of Ecological Problem of the North, 23 Nab. Severnoi Dviny, 163000 Arkhangelsk, Russia; GET UMR 5563 CNRS University of Toulouse, 14 av. Edouard Belin, 31400 Toulouse, France
| | - Liudmila S Shirokova
- Federal Center for Integrated Arctic Research, Institute of Ecological Problem of the North, 23 Nab. Severnoi Dviny, 163000 Arkhangelsk, Russia; GET UMR 5563 CNRS University of Toulouse, 14 av. Edouard Belin, 31400 Toulouse, France
| | - Yves Auda
- GET UMR 5563 CNRS University of Toulouse, 14 av. Edouard Belin, 31400 Toulouse, France
| | - Nadezhda S Zinner
- Department of Agricultural Biology, Tomsk State University, 36 av. Lenina, 634050 Tomsk, Russia; Department of Pharmacy, Siberian State Medical University, 2 Moskovsky trakt, 634050 Tomsk, Russia
| | - Sergey N Vorobyev
- BIO-GEO-CLIM Laboratory, Tomsk State University, 36 av. Lenina, 634050 Tomsk, Russia
| | - Sergey N Kirpotin
- BIO-GEO-CLIM Laboratory, Tomsk State University, 36 av. Lenina, 634050 Tomsk, Russia
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Valenzuela EI, Cervantes FJ. The role of humic substances in mitigating greenhouse gases emissions: Current knowledge and research gaps. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 750:141677. [PMID: 33182214 DOI: 10.1016/j.scitotenv.2020.141677] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2020] [Revised: 08/10/2020] [Accepted: 08/11/2020] [Indexed: 06/11/2023]
Abstract
Humic substances (HS) constitute a highly transformed fraction of natural organic matter (NOM) with a heterogeneous structure, which is rich in electron-transferring functional moieties. Because of this feature, HS display a versatile reactivity with a diversity of environmentally relevant organic and inorganic compounds either by abiotic or microbial processes. Consequently, extensive research has been conducted related to the potential of HS to drive relevant processes in bio-engineered systems, as well as in the biogeochemical cycling of key elements in natural environments. Nevertheless, the increase in the number of reports examining the relationship between HS and the microorganisms related to the production and consumption of greenhouse gases (GHG), the main drivers of global warming, has just emerged in the last years. In this paper, we discuss the importance of HS, and their analogous redox-active organic molecules (RAOM), on controlling the emission of three of the most relevant GHG due to their tight relationship with microbial activity, their abundance on the Earth's atmosphere, and their important global warming potentials: carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O). The current knowledge gaps concerning the microbial component, on-site occurrence, and environmental constraints affecting these HS-mediated processes are provided. Furthermore, strategies involving the metabolic traits that GHG-consuming/HS-reducing and -oxidizing microbes display for the development of environmental engineered processes are also discussed.
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Affiliation(s)
- Edgardo I Valenzuela
- División de Ciencias Ambientales, Instituto Potosino de Investigación Científica y Tecnológica (IPICYT), San Luis Potosí, Mexico.
| | - Francisco J Cervantes
- Laboratory for Research on Advanced Processes for Water Treatment, Engineering Institute, Campus Juriquilla, Universidad Nacional Autónoma de México (UNAM), Querétaro, Mexico.
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Cabrol L, Thalasso F, Gandois L, Sepulveda-Jauregui A, Martinez-Cruz K, Teisserenc R, Tananaev N, Tveit A, Svenning MM, Barret M. Anaerobic oxidation of methane and associated microbiome in anoxic water of Northwestern Siberian lakes. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 736:139588. [PMID: 32497884 DOI: 10.1016/j.scitotenv.2020.139588] [Citation(s) in RCA: 47] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Revised: 05/07/2020] [Accepted: 05/19/2020] [Indexed: 05/16/2023]
Abstract
Arctic lakes emit methane (CH4) to the atmosphere. The magnitude of this flux could increase with permafrost thaw but might also be mitigated by microbial CH4 oxidation. Methane oxidation in oxic water has been extensively studied, while the contribution of anaerobic oxidation of methane (AOM) to CH4 mitigation is not fully understood. We have investigated four Northern Siberian stratified lakes in an area of discontinuous permafrost nearby Igarka, Russia. Analyses of CH4 concentrations in the water column demonstrated that 60 to 100% of upward diffusing CH4 was oxidized in the anoxic layers of the four lakes. A combination of pmoA and mcrA gene qPCR and 16S rRNA gene metabarcoding showed that the same taxa, all within Methylomonadaceae and including the predominant genus Methylobacter as well as Crenothrix, could be the major methane-oxidizing bacteria (MOB) in the anoxic water of the four lakes. Correlation between Methylomonadaceae and OTUs within Methylotenera, Geothrix and Geobacter genera indicated that AOM might occur in an interaction between MOB, denitrifiers and iron-cycling partners. We conclude that MOB within Methylomonadaceae could have a crucial impact on CH4 cycling in these Siberian Arctic lakes by mitigating the majority of produced CH4 before it leaves the anoxic zone. This finding emphasizes the importance of AOM by Methylomonadaceae and extends our knowledge about CH4 cycle in lakes, a crucial component of the global CH4 cycle.
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Affiliation(s)
- Léa Cabrol
- Aix-Marseille University, Univ Toulon, CNRS, IRD, M.I.O. UM 110, Mediterranean Institute of Oceanography, Marseille, France; Institute of Ecology and Biodiversity IEB, Faculty of Sciences, Universidad de Chile, Santiago, Chile; Escuela de Ingeniería Bioquímica, Pontificia Universidad de Valparaiso, Av Brasil 2085, Valparaiso, Chile
| | - Frédéric Thalasso
- Biotechnology and Bioengineering Department, Center for Research and Advanced Studies (Cinvestav), Mexico City, Mexico
| | - Laure Gandois
- Laboratory of Functional Ecology and Environment, Université de Toulouse, CNRS, Toulouse, France
| | - Armando Sepulveda-Jauregui
- ENBEELAB, University of Magallanes, Punta Arenas, Chile; Center for Climate and Resilience Research (CR)2, Santiago, Chile
| | | | - Roman Teisserenc
- Laboratory of Functional Ecology and Environment, Université de Toulouse, CNRS, Toulouse, France
| | | | - Alexander Tveit
- Department of Arctic and Marine Biology, UiT The Arctic University of Norway, Tromsø, Norway
| | - Mette M Svenning
- Department of Arctic and Marine Biology, UiT The Arctic University of Norway, Tromsø, Norway
| | - Maialen Barret
- Laboratory of Functional Ecology and Environment, Université de Toulouse, CNRS, Toulouse, France.
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