A5043015956- Marine and coastal ecosystems
- Marine Biology and Ecology Research
- Isotope Analysis in Ecology
- Geology and Paleoclimatology Research
- Marine Bivalve and Aquaculture Studies
- Ocean Acidification Effects and Responses
- Methane Hydrates and Related Phenomena
- Microbial Community Ecology and Physiology
- Soil and Water Nutrient Dynamics
- Coastal wetland ecosystem dynamics
- Marine and coastal plant biology
- Coral and Marine Ecosystems Studies
- Assisted Reproductive Technology and Twin Pregnancy
- Marine and fisheries research
- Atmospheric and Environmental Gas Dynamics
- Hydrocarbon exploration and reservoir analysis
- Geochemistry and Elemental Analysis
- Aquatic Ecosystems and Phytoplankton Dynamics
- Paleontology and Stratigraphy of Fossils
- Marine and environmental studies
- Peatlands and Wetlands Ecology
- Fish Ecology and Management Studies
- Wastewater Treatment and Nitrogen Removal
- Prenatal Screening and Diagnostics
- Coastal and Marine Management
Utrecht University
2016-2025
Vrije Universiteit Amsterdam
2024
University of Bremen
2024
University of Antwerp
2023
University of Vienna
2023
Delft University of Technology
2023
ORCID
2021
Royal Netherlands Institute for Sea Research
2008-2019
Netherlands Environmental Assessment Agency
2019
Ocean University of China
2019
One of the major impediments to integration lentic ecosystems into global environmental analyses has been fragmentary data on extent and size distribution lakes, ponds, impoundments. We use new sources, enhanced spatial resolution, analytical approaches provide estimates abundance surface-water bodies. A model based Pareto shows that natural lakes is twice as large previously known (304 million lakes; 4.2 km2 in area) dominated area by millions water bodies smaller than 1 km2. Similar...
<strong class="journal-contentHeaderColor">Abstract.</strong> The carbon burial in vegetated sediments, ignored past assessments of the ocean, was evaluated using a bottom-up approach derived from upscaling compilation published individual estimates habitats (seagrass meadows, salt marshes and mangrove forests) to global level top-down considerations sediment balance organic content vegeatated sediments. Up-scaling values yielded total 111 Tmol C y<sup>-1</sup>. unvegetated...
Mangrove forests are highly productive but globally threatened coastal ecosystems, whose role in the carbon budget of zone has long been debated. Here we provide a comprehensive synthesis available data on fluxes mangrove ecosystems. A reassessment global primary production from literature results conservative estimate ∼218 ± 72 Tg C −1 . When using best estimates various sinks (organic export, sediment burial, and mineralization), it appears that >50% fixed by vegetation is unaccounted...
Marine Crenarchaeota are the most abundant single group of prokaryotes in ocean, but their physiology and role marine biogeochemical cycles unknown. Recently, a member this clade was isolated from sea aquarium shown to be capable nitrification, tentatively suggesting that may play oceanic nitrogen cycle. We enriched crenarchaeote North Sea water showed its abundance, not bacteria, correlates with ammonium oxidation nitrite. A time series study revealed abundance gene encoding for archaeal...
Ever since Darwin's early descriptions of coral reefs, scientists have debated how one the world's most productive and diverse ecosystems can thrive in marine equivalent a desert. It is an enigma flux dissolved organic matter (DOM), largest resource produced on transferred to higher trophic levels. Here we show that sponges make DOM available fauna by rapidly expelling filter cells as detritus subsequently consumed reef fauna. This "sponge loop" was confirmed aquarium situ food web...
Ocean acidification resulting from human emissions of carbon dioxide has already lowered and will further lower surface ocean pH. The consequent decrease in calcium carbonate saturation potentially threatens calcareous marine organisms. Here, we demonstrate that the calcification rates edible mussel ( Mytilus edulis ) Pacific oyster Crassostrea gigas decline linearly with increasing pCO 2 . Mussel may by 25 10%, respectively, end century, following IPCC IS92a scenario (∼740 ppmv 2100)....
Abstract. Coastal hypoxia (defined here as <1.42 ml L−1; 62.5 μM; 2 mg L−1, approx. 30% oxygen saturation) develops seasonally in many estuaries, fjords, and along open coasts a result of natural upwelling or from anthropogenic eutrophication induced by riverine nutrient inputs. Permanent occurs naturally some isolated seas marine basins well slope minimum zones. Responses benthos to depend on the duration, predictability, intensity depletion whether H2S is formed. Under suboxic...
Abstract. The intensity, duration and frequency of coastal hypoxia (oxygen concentration <63 μM) are increasing due to human alteration ecosystems changes in oceanographic conditions global warming. Here we provide a concise review the consequences for sediment biogeochemistry. Changes bottom-water oxygen levels have early diagenetic pathways (more anaerobic at expense aerobic pathways), efficiency re-oxidation reduced metabolites nature, direction magnitude sediment-water exchange...
Seagrass meadows are highly productive habitats found along many of the world's coastline, providing important services that support overall functioning coastal zone. The organic carbon accumulates in seagrass is derived not only from production but trapping other particles, as canopies facilitate sedimentation and reduce resuspension. Here we provide a comprehensive synthesis available data to obtain better understanding relative contribution possible sources matter accumulate sediments...
At two intertidal sites (one sandy and one silty, in the Scheldt estuary, The Netherlands), fate of microphytobenthos was studied through an situ 13 C puls‐chase experiment. Label added at beginning low tide, uptake by algae linear during whole period tidal exposure (about 27 mg m −2 h −1 top millimeter both sites). fixed rapidly displaced toward deeper sediment layers (down to 6 cm), particular dynamic, site. residence times with respect external losses (resuspension respiration) were about...
The use of biomarkers in combination with stable isotope analysis is a new approach microbial ecology and number papers on variety subjects have appeared. We will first discuss the techniques for analysing isotopes biomarkers, primarily gas chromatography-combustion-isotope ratio mass spectrometry, then describe applications based 13C. Natural abundance ratios can be used to study organic matter sources utilised by microorganisms complex ecosystems identifying specific groups bacteria like...
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...
We estimated organic carbon (OC) burial over the past century in 40 impoundments one of most intensively agricultural regions world. The volume sediment deposited per unit time varied as a function lake and watershed size, but smaller had greater deposition accumulation rates area. Annual water storage losses from 0.1–20% were negatively correlated with impoundment size. Estimated OC content was greatest lakes low ratios to Sediment higher than those assumed for fertile by previous studies...
Examination of amino acids in particulate samples from a variety marine environments (fresh phytoplankton to deep‐sea sediments) revealed systematic compositional changes upon progressive degradation. These consistent trends have been used derive quantitative degradation index (DI) that is directly related the reactivity organic material, as indicated by its lability enzymatic decay and first‐order rate constant. This direct link between molecular composition allows us quantify quality...
Sediment cores from six stations in the eastern North Sea were analyzed for protein amino acids, nonprotein acids β-alanine and γ- aminobutyric acid hexosamines galactosamine glucosamine, bulk parameters (organic carbon, nitrogen, total hydrolyzable carbohydrates) order to establish degradation state of sedimentary organic matter. The study sites selected on basis their different physical settings macrofaunal communities so that a broad quality range matter would likely be covered. To test...
Abstract. Various human activities – including agriculture, water consumption, river damming, and aquaculture have intensified over the last century. This has had a major impact on nitrogen (N) phosphorus (P) cycling in global continental waters. In this study, we use coupled nutrient-input–hydrology–in-stream nutrient retention model to quantitatively track changes freshwater N P cycles 20th Our results suggest that, during period, delivery streams increased from 34 64 Tg yr−1 5 9 yr−1....