A5006168594- Methane Hydrates and Related Phenomena
- Microbial Community Ecology and Physiology
- Atmospheric and Environmental Gas Dynamics
- Hydrocarbon exploration and reservoir analysis
- Microbial metabolism and enzyme function
- Wastewater Treatment and Nitrogen Removal
- Genomics and Phylogenetic Studies
- Anaerobic Digestion and Biogas Production
- Geology and Paleoclimatology Research
- Climate change and permafrost
- Peatlands and Wetlands Ecology
- Landslides and related hazards
- Hemoglobin structure and function
- Coastal wetland ecosystem dynamics
- Tree Root and Stability Studies
- CO2 Sequestration and Geologic Interactions
- Microbial bioremediation and biosurfactants
- Marine and coastal ecosystems
GFZ Helmholtz Centre for Geosciences
2019-2024
University of Göttingen
2022-2024
Radboud University Nijmegen
2012-2021
Netherlands Earth System Science Centre
2016-2021
Utrecht University
2018
Abstract Methane (CH 4 ) is produced in many natural systems that are vulnerable to change under a warming climate, yet current CH budgets, as well future shifts emissions, have high uncertainties. Climate has the potential increase emissions from critical such wetlands, marine and freshwater systems, permafrost, methane hydrates, through temperature, hydrology, vegetation, landscape disturbance, sea level rise. Increased these would turn induce further climate change, resulting positive...
Methane is a powerful greenhouse gas and its biological conversion in marine sediments, largely controlled by anaerobic oxidation of methane (AOM), crucial part the global carbon cycle. However, little known about role iron oxides as an oxidant for AOM. Here we provide first field evidence iron-dependent AOM brackish coastal surface sediments show that produced Bothnian Sea oxidized distinct zones iron- sulfate-dependent At our study site, anthropogenic eutrophication over recent decades has...
ABSTRACT Methane is an important greenhouse gas and the most abundant hydrocarbon in Earth's atmosphere. Methanotrophic microorganisms can use methane as their sole energy source play a crucial role mitigation of emissions environment. “ Candidatus Methylomirabilis oxyfera” recently described intra-aerobic methanotroph that assumed to nitric oxide generate internal oxygen oxidize via conventional aerobic pathway, including monooxygenase reaction. Previous genome analysis has suggested that,...
Arctic permafrost soils store large amounts of organic matter that is sensitive to temperature increases and subsequent microbial degradation methane (CH 4 ) carbon dioxide (CO 2 ). Here, we studied methanogenic methanotrophic activity community composition in thermokarst lake sediments from Utqiag˙vik (formerly Barrow), Alaska. This experiment was carried out under situ conditions (4°C) the IPCC 2013 climate change scenario (10°C) after addition substrates for nearly a year. Trimethylamine...
Abstract The biological nitrogen cycle is driven by a plethora of reactions transforming compounds between various redox states. Here, we investigated the metagenomic potential for in situ microbial community an oligotrophic, brackish environment Bothnian Sea sediment. Total DNA from three sediment depths was isolated and sequenced. characterization total performed based on 16S rRNA gene inventory using SILVA database as reference. diversity diagnostic functional genes coding nitrate...
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Abstract The Bothnian Sea is an oligotrophic brackish basin characterized by low salinity and high concentrations of reactive iron, methane, ammonium in its sediments, enabling the activity interactions many microbial guilds. Here, we studied network these sediments analyzing geochemical community depth profiles at one offshore two near coastal sites. Analysis 16S rRNA gene amplicons revealed a distinct stratification both archaeal bacterial taxa. communities sites were more similar to each...
Microbial methane oxidation is a major biofilter preventing larger emissions of this powerful greenhouse gas from marine coastal areas into the atmosphere. In these zones, various electron acceptors such as sulfate, metal oxides, nitrate, or oxygen can be used. However, key microbial players and mechanisms are poorly understood. study, we inoculated bioreactor with methane- iron-rich sediments Bothnian Sea to investigate iron cycling under low concentrations. Using metagenomics, investigated...
Globally, large-scale land drainage has severely deteriorated the functioning and services of peatlands, making restoration plans utmost importance. Rewetting is essential for drained but level success including greenhouse gas (GHG) mitigation largely depends on soil microbiome interactions under prevailing biogeochemical conditions. Here, we investigated effects inundation iron (Fe) -rich peat topsoils nutrient release, surface water quality, GHG production consumption, composition activity...
Hopanoids are lipids that widespread in the bacterial domain and well established molecular biomarkers modern paleo environments. In particular, occurrence of 13C-depleted 3-methylated hopanoids characteristic aerobic bacteria involved methane oxidation. Previously intra-aerobic methanotroph 'Candidatus Methylomirabilis oxyfera' ('Ca. M. oxyfera'), which performs nitrite-dependent oxidation anoxic environments, has been shown to synthesize bacteriohopanepolyols (BHPs) their counterparts....
Abstract The Bothnian Sea is an oligotrophic brackish basin characterized by low salinity and high concentrations of reactive iron, methane ammonium in the sediments potentially enabling intricate microbial network. Therefore, we analyzed compared biogeochemical profiles at one offshore two near coastal sites Sea. 16S rRNA amplicon sequence analysis revealed stratification both bacterial archaeal taxa accordance with geochemical gradients sulfate methane. communities were more similar to...
Microbial mats, due to stratification of the redox zones, have a potential include complete N cycle, however an attempt evaluate cycle in these ecosystems has not been yet made. In this study, occurrence and rates major processes were evaluated intact microbial mats from Elkhorn Slough, Monterey Bay, CA, USA, Baja California Sur, Mexico under oxic anoxic conditions using 15N-labeling techniques. All transformation pathways, with exception anammox, detected both mats. Nitrification found be...
Landslides are an important erosion mechanism in mountainous terrain. They strip large quantities of organic material from ecosystems and expose bedrock to weathering. At the west side New Zealand’s Southern Alps, super-humid climate slope instabilities create ideal conditions for frequent landslides, allowing studies soil formation processes short-term chronosequences. Here, we investigated soils three landslides that occurred 2019 (“young”), 1997...
Abstract Microbial methane oxidation is a major biofilter preventing larger emissions of this powerful greenhouse gas from marine coastal areas into the atmosphere. In these zones, various electron acceptors such as sulfate, metal oxides, nitrate or oxygen can be utilized. However, key microbial players and mechanisms are poorly understood. study, we inoculated bioreactor with methane- iron-rich sediments Bothnian Sea in order to investigate iron cycling under low concentrations. Using...