A5039479895- Marine and coastal ecosystems
- Microbial Community Ecology and Physiology
- Microbial Fuel Cells and Bioremediation
- Marine Biology and Ecology Research
- Methane Hydrates and Related Phenomena
- Geology and Paleoclimatology Research
- Ocean Acidification Effects and Responses
- Geochemistry and Elemental Analysis
- Geological formations and processes
- Marine and environmental studies
- Marine Bivalve and Aquaculture Studies
- Groundwater flow and contamination studies
- Soil and Water Nutrient Dynamics
- CO2 Sequestration and Geologic Interactions
- Wastewater Treatment and Nitrogen Removal
- Aquatic Ecosystems and Phytoplankton Dynamics
- Hydrocarbon exploration and reservoir analysis
- Groundwater and Isotope Geochemistry
- Geochemistry and Geologic Mapping
- Protist diversity and phylogeny
- Mine drainage and remediation techniques
- Isotope Analysis in Ecology
- Oceanographic and Atmospheric Processes
- Photoreceptor and optogenetics research
- Aquatic Invertebrate Ecology and Behavior
University of Antwerp
2017-2024
Delft University of Technology
2017-2024
Utrecht University
2002-2023
University of Vienna
2023
University of Southern Denmark
2020
Monash University
2020
Southern Cross University
2020
KU Leuven
2019
Ghent University
2003-2019
Vrije Universiteit Brussel
2008-2018
Denitrifying and anammox bacteria are involved in the nitrogen cycling marine sediments but environmental factors that regulate relative importance of these processes not well constrained. Here, we evaluated abundance, diversity, potential activity denitrifying, anammox, sulfide-dependent denitrifying seasonally hypoxic saline Lake Grevelingen, known to harbor an active microbial community sulfur oxidation pathways. Depth distributions 16S rRNA gene, nirS gene bacteria, aprA sulfur-oxidizing...
Abstract Accelerated mass loss from the Greenland ice sheet leads to glacier retreat and an increasing input of glacial meltwater fjords coastal waters around Greenland. These high latitude ecosystems are highly productive sustain important fisheries, yet it remains uncertain how they will respond future changes in Arctic cryosphere. Here we show that marine‐terminating glaciers play a crucial role sustaining productivity fjord ecosystems. Hydrographic biogeochemical data two systems...
Enhanced weathering of (ultra)basic silicate rocks such as olivine-rich dunite has been proposed a large-scale climate engineering approach. When implemented in coastal environments, olivine is expected to increase seawater alkalinity, thus resulting additional CO2 uptake from the atmosphere. However, mechanisms marine and its effect on seawater–carbonate chemistry remain poorly understood. Here, we present results batch reaction experiments, which forsteritic was subjected rotational...
Cold-water coral reefs and adjacent sponge grounds are distributed widely in the deep ocean, where only a small fraction of surface productivity reaches seafloor as detritus. It remains elusive how these hotspots biodiversity can thrive such food-limited environment, data on energy flow organic carbon utilization critically lacking. Here we report situ community respiration rates for cold-water ecosystems obtained by non-invasive aquatic Eddy Correlation technique. Oxygen uptake over Træna...
Cable bacteria of the family Desulfobulbaceae form centimeter-long filaments comprising thousands cells. They occur worldwide in surface aquatic sediments, where they connect sulfide oxidation with oxygen or nitrate reduction via long-distance electron transport. In absence pure cultures, we used single-filament genomics and metagenomics to retrieve draft genomes 3 marine Candidatus Electrothrix 1 freshwater Ca. Electronema species. These contain >50% unknown genes but still share their core...
Seasonal oxygen depletion (hypoxia) in coastal bottom waters can lead to the release and persistence of free sulfide (euxinia), which is highly detrimental marine life. Although hypoxia relatively common, reports euxinia are less frequent, suggests that certain environmental controls delay onset euxinia. However, these their prevalence poorly understood. Here we present field observations from a seasonally hypoxic basin (Grevelingen, The Netherlands), suggest activity cable bacteria,...
Abstract Recently, a novel mode of sulphur oxidation was described in marine sediments, which sulphide deeper anoxic layers electrically coupled to oxygen reduction at the sediment surface. Subsequent experimental evidence identified that long filamentous bacteria belonging family Desulfobulbaceae likely mediated electron transport across centimetre-scale distances. Such long-range transfer challenges some long-held views microbial ecology and could have profound implications for cycling...
Phosphorus is an essential nutrient for life. The release of phosphorus from sediments critical in sustaining phytoplankton growth many aquatic systems and pivotal to eutrophication the development bottom water hypoxia. Conventionally, sediment thought be controlled by changes iron oxide reduction driven variations external environmental factors, such as organic matter input oxygen. Here, we show that internal shifts microbial communities, specifically population dynamics cable bacteria, can...
The quantitative mapping of food web flows based on empirical data is a crucial yet difficult task in ecology. difficulty arises from the under-sampling webs, because most sets are incomplete and uncertain. In this article, we review methods to quantify using linear inverse models (LIM). LIM described as function its flows, which estimated by modeling. webs implies that infinitely many different solutions exist consistent with given set. existing approaches select single solution infinite...
Abstract Biological electron transport is classically thought to occur over nanometre distances, yet recent studies suggest that electrical currents can run along centimetre-long cable bacteria. The phenomenon remains elusive, however, as have not been directly measured, nor the conductive structures identified. Here we demonstrate bacteria conduct electrons centimetre distances via highly fibres embedded in cell envelope. Direct electrode measurements reveal nanoampere intact filaments up...
Significance Cable bacteria are centimeter-long, multicellular filamentous bacteria, which globally occurring in marine and freshwater sediments. Their presence coincides with the occurrence of electrical fields, gradients oxygen sulfide that best explained by electron transport from to along cable-bacteria filaments, implying electric conductance living over centimeter distances. Until now, all indications for such long-distance were derived bulk sediment incubations. Here we present...
Recently, a novel "electrogenic" type of sulfur oxidation has been documented in marine sediments, whereby long filamentous cable bacteria are generating electrical currents over centimeter-scale distances. Here we propose numerical model description that is capable quantitatively simulating the solute depth profiles and biogeochemical transformations such electro-active sediments. The based on conventional reactive transport which extended with new formulation for long-distance electron...
Abstract Silica is an essential element for marine life and plays a key role in the biogeochemistry of ocean. Glacial activity stimulates rock weathering, generating dissolved silica that exported to coastal areas along with meltwater. The magnitude export from large glacial such as Greenland Ice Sheet presently poorly quantified not accounted global budgets. Here we present data two fjord systems adjacent which reveal by meltwater relative other macronutrients. Upscaled entire Sheet, equals...
Recently, a novel electrogenic type of sulphur oxidation was documented in marine sediments, whereby filamentous cable bacteria (Desulfobulbaceae) are mediating electron transport over cm-scale distances. These capable developing an extensive network within days, implying highly efficient carbon acquisition strategy. Presently, the metabolism is unknown, and hence we adopted multidisciplinary approach to study substrate utilization both associated microbial community sediment incubations....
Abstract. Recently, long filamentous bacteria have been reported conducting electrons over centimetre distances in marine sediments. These so-called cable perform an electrogenic form of sulfur oxidation, whereby long-distance electron transport links sulfide oxidation deeper sediment horizons to oxygen reduction the upper millimetres sediment. Electrogenic exerts a strong impact on local biogeochemistry, but it is currently unknown how prevalent process within seafloor. Here we provide...
Globally, the methane (CH4) efflux from ocean to atmosphere is small, despite high rates of CH4 production in continental shelf and slope environments. This low results biological removal through anaerobic oxidation with sulfate marine sediments. In some settings, however, pore water found throughout sulfate-bearing zone, indicating an apparently inefficient barrier for CH4. Here we demonstrate that rapid sediment accumulation can explain this limited capacity coastal a saline reservoir...
Filamentous sulfide oxidizing cable bacteria are capable of linking the oxidation free in deep anoxic layers marine sediments to reduction oxygen or nitrate surface by conducting electrons over centimeter-scale distances. Previous studies have shown that this newly discovered microbial process, referred as electrogenic (e-SOx), may alter elemental cycling sediments, but nature and rates resulting biogeochemical transformations their influence on benthic-pelagic coupling remain largely...