Mark A. Lever
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View article: Distribution of methane-cycling archaea in buried ridge flank sediment: community zonation, activity, and potential environmental drivers
Distribution of methane-cycling archaea in buried ridge flank sediment: community zonation, activity, and potential environmental drivers Open
Subseafloor sediments harbor Earth’s biggest reservoir of methane, with most of this methane being produced biologically by methanogenic archaea (methanogens). Yet, little is known about the controls on in situ abundances, community struct…
View article: Distribution of methane-cycling archaea in buried ridge flank sediment: community zonation, activity, and potential environmental drivers
Distribution of methane-cycling archaea in buried ridge flank sediment: community zonation, activity, and potential environmental drivers Open
Subseafloor sediments harbor Earth’s biggest reservoir of methane, with most of this methane being produced biologically by methanogenic archaea (methanogens). Yet, little is known about the controls on in situ abundances, community struct…
View article: Microbial sulfur cycling across a 13 500-year-old lake sediment record
Microbial sulfur cycling across a 13 500-year-old lake sediment record Open
The sulfur cycle is very important in lake sediments, despite the much lower sulfate concentrations in freshwater than seawater. To date, little is known about the formation and preservation of organic and inorganic sulfur compounds in suc…
View article: Methanogenesis by CO <sub>2</sub> reduction dominates lake sediments with different organic matter compositions
Methanogenesis by CO <sub>2</sub> reduction dominates lake sediments with different organic matter compositions Open
Microbial methane production is a key reaction involved in the terminal step of anaerobic degradation of organic matter. The energy substrates of methane-producing microorganisms are largely generated during the breakdown of larger organic…
View article: Early warning signs of salt marsh drowning indicated by widespread vulnerability from declining belowground plant biomass
Early warning signs of salt marsh drowning indicated by widespread vulnerability from declining belowground plant biomass Open
Salt marshes provide valuable ecosystem services but are vulnerable to drowning with accelerated sea-level rise (SLR). Marsh belowground biomass (BGB) production helps avoid drowning by building marsh surface elevation. Reductions in BGB c…
View article: Holocene environmental change in Rotsee and its impact on sedimentary carbon storage
Holocene environmental change in Rotsee and its impact on sedimentary carbon storage Open
To assess the long-term impact of climate change and human influence on lakes and their sedimentary carbon storage, paleo-environmental approaches using well-dated lake sediment cores can be employed. Here, we reconstruct carbon mass accum…
View article: Resilience of deep aquifer microbial communities to seasonal hydrological fluctuations
Resilience of deep aquifer microbial communities to seasonal hydrological fluctuations Open
The influence of seasonal variations in temperature and precipitation on subsurface biogeochemical processes remains poorly understood. In the Lavey-les-Bains thermal system in the Swiss Alps, annual variations in electrical conductivity a…
View article: Controls on brGDGT production in the seasonally anoxic water column and sediments of Rotsee
Controls on brGDGT production in the seasonally anoxic water column and sediments of Rotsee Open
View article: Methanogenesis by CO <sub>2</sub> reduction dominates lake sediments with different organic matter compositions
Methanogenesis by CO <sub>2</sub> reduction dominates lake sediments with different organic matter compositions Open
Microbial methane production is a respiration reaction involved in the terminal step of anaerobic degradation of organic matter. Due to the dependency of methanogenic substrate production on fermentation reactions that produce different en…
View article: Drivers of methane-cycling archaeal abundances, community structure, and catabolic pathways in continental margin sediments
Drivers of methane-cycling archaeal abundances, community structure, and catabolic pathways in continental margin sediments Open
Marine sediments contain Earth’s largest reservoir of methane, with most of this methane being produced and consumed in situ by methane-cycling archaea. While numerous studies have investigated communities of methane-cycling archaea in hyd…
View article: Persistent functional and taxonomic groups dominate an 8,000-year sedimentary sequence from Lake Cadagno, Switzerland
Persistent functional and taxonomic groups dominate an 8,000-year sedimentary sequence from Lake Cadagno, Switzerland Open
Most of our knowledge of deep sedimentary life comes from marine environments; however, despite their relatively small volume, lacustrine sediments constitute one of the largest global carbon sinks and their deep sediments are largely unex…
View article: Active microbial sulfur cycling across a 13,500-year-old lake sediment record
Active microbial sulfur cycling across a 13,500-year-old lake sediment record Open
The sulfur cycle is very important in lake sediments, despite the much lower sulfate concentrations in freshwater than seawater. To date, little is known about the formation and preservation of organic and inorganic sulfur compounds in suc…
View article: The effect of a short oxygen exposure period on algal biomass degradation and methane release from eutrophic and oligotrophic lake sediments
The effect of a short oxygen exposure period on algal biomass degradation and methane release from eutrophic and oligotrophic lake sediments Open
Algal blooms in lakes result in large amounts of labile carbon being transported down the water column towards the sediments, often resulting in temporary water column hypoxia. The algal biomass is deposited at the surface sediments, where…
View article: Holocene environmental change in Rotsee and its impact on sedimentary carbon storage
Holocene environmental change in Rotsee and its impact on sedimentary carbon storage Open
To assess the long-term impact of climate change and human influence on lakes and their sedimentary carbon storage, paleo-environmental approaches using well-dated lake sediment cores can be employed. Here, we reconstruct carbon mass accum…
View article: Drivers of methane-cycling archaeal abundances, community structure, and catabolic pathways in continental margin sediments
Drivers of methane-cycling archaeal abundances, community structure, and catabolic pathways in continental margin sediments Open
Marine sediments contain the largest reservoir of methane on Earth, with most of this methane being produced and consumed in situ by methane-cycling archaea. While numerous studies have investigated communities of methane-cycling archaea i…
View article: Capturing spatiotemporal variation in salt marsh belowground biomass, a key resilience metric, through geoinformatics
Capturing spatiotemporal variation in salt marsh belowground biomass, a key resilience metric, through geoinformatics Open
The Belowground Ecosystem Resiliency Model (BERM) is a geoinformatics tool that was developed to predict belowground biomass (BGB) of Spartina alterniflora in salt marshes based on remote sensing of aboveground characteristics and other re…
View article: Salt Marsh Productivity Modeling Reveals Widespread Declining Belowground Biomass and Potential for Marsh Drowning
Salt Marsh Productivity Modeling Reveals Widespread Declining Belowground Biomass and Potential for Marsh Drowning Open
View article: Controls on brGDGT distributions in the suspended particulate matter of the seasonally anoxic water column of Rotsee
Controls on brGDGT distributions in the suspended particulate matter of the seasonally anoxic water column of Rotsee Open
Developing reliable methods for quantifying past temperature changes is essential for understanding Earth's climate evolution and predicting future climatic shifts. The degree of methylation of branched tetraethers (MBT’5ME), of branched g…
View article: Peat Particulate Organic Matter Accepts Electrons During In Situ Incubation in the Anoxic Subsurface of Ombrotrophic Bogs
Peat Particulate Organic Matter Accepts Electrons During In Situ Incubation in the Anoxic Subsurface of Ombrotrophic Bogs Open
Peat particulate organic matter (POM) in the anoxic subsurface of peatlands is increasingly recognized as an important terminal electron acceptor (TEA) in anaerobic respiration. While POM reduction has been demonstrated in laboratory peat‐…
View article: Peat particulate organic matter accepts electrons during in situ incubation in the anoxic subsurface of ombrotrophic bogs
Peat particulate organic matter accepts electrons during in situ incubation in the anoxic subsurface of ombrotrophic bogs Open
Peat particulate organic matter (POM) in the anoxic subsurface of peatlands is increasingly recognized as an important terminal electron acceptor (TEA) in anaerobic respiration.While POM reduction has been demonstrated in laboratory peat-s…
View article: Impacts of temperature and fluid seepage on organic matter composition in sediments of an active hydrothermal basin
Impacts of temperature and fluid seepage on organic matter composition in sediments of an active hydrothermal basin Open
Marine sediments are one of the largest organic carbon (OC) sinks on Earth. Yet, major knowledge gaps remain in our understanding of sedimentary OC cycling, particularly regarding temperature-induced alteration processes of OC from differe…
View article: The effect of a short oxygen exposure period on algal biomass degradation and methane formation in eutrophic and oligotrophic lake sediments
The effect of a short oxygen exposure period on algal biomass degradation and methane formation in eutrophic and oligotrophic lake sediments Open
Eutrophication is suggested to enhance lacustrine methane emissions, due to enhanced sedimentary decomposition rates of algal biomass, and more frequent occurrence of water column anoxia. We investigated methane emissions from sediments or…
View article: brGDGT paleothermometer MBT&#8217;5ME as a novel diagnostic tool to detect thermal stratification in lakes
brGDGT paleothermometer MBT’5ME as a novel diagnostic tool to detect thermal stratification in lakes Open
The brGDGT-based ratio MBT’5ME has been widely used in soil (1) and lake (2) systems globally to estimate changes in mean annual temperature over time. Despite the development of numerous lake-specific calibrations (3, 4), a substant…
View article: Seawater contamination by coring and pore water sampling of marine sediments
Seawater contamination by coring and pore water sampling of marine sediments Open
Coring of sediments with minimal physical disturbance, and sampling of pore water with minimal contamination from seawater, are critical in marine geochemistry and microbiology. Yet, sediment coring generally causes smearing of sediment do…
View article: Seasonal temperature dependency of aquatic branched glycerol dialkyl glycerol tetraethers: A mesocosm approach
Seasonal temperature dependency of aquatic branched glycerol dialkyl glycerol tetraethers: A mesocosm approach Open
View article: Editorial: Studies on life at the energetic edge – from laboratory experiments to field-based investigations, volume II
Editorial: Studies on life at the energetic edge – from laboratory experiments to field-based investigations, volume II Open
EDITORIAL article Front. Microbiol., 04 January 2024Sec. Extreme Microbiology Volume 14 - 2023 | https://doi.org/10.3389/fmicb.2023.1351761
View article: Hydrogen–independent CO2 reduction dominates methanogenesis in five temperate lakes that differ in trophic states
Hydrogen–independent CO2 reduction dominates methanogenesis in five temperate lakes that differ in trophic states Open
Emissions of microbially produced methane (CH4) from lake sediments are a major source of this potent greenhouse gas to the atmosphere. The rates of CH4 production and emission are believed to be influenced by electron acceptor distributio…
View article: Metagenomic and -transcriptomic analyses of microbial nitrogen transformation potential, and gene expression in Swiss lake sediments
Metagenomic and -transcriptomic analyses of microbial nitrogen transformation potential, and gene expression in Swiss lake sediments Open
The global nitrogen (N) cycle has been strongly altered by anthropogenic activities, including increased input of bioavailable N into aquatic ecosystems. Freshwater sediments are hotspots with regards to the turnover and elimination of fix…
View article: Referee report. For: Targeting deeply-sourced seeps along the Central Volcanic Zone [version 1; peer review: 1 approved]
Referee report. For: Targeting deeply-sourced seeps along the Central Volcanic Zone [version 1; peer review: 1 approved] Open
View article: Comment on egusphere-2023-2102
Comment on egusphere-2023-2102 Open
Abstract. The addition of sulfur (S) to organic matter to form organosulfur compounds is generally thought to protect organic matter from microbial degradation and promote its preservation. While most microbial sulfur cycl…