A5075686033- Soil and Water Nutrient Dynamics
- Microbial Community Ecology and Physiology
- Fish Ecology and Management Studies
- Marine and coastal ecosystems
- Aquatic Invertebrate Ecology and Behavior
- Hydrology and Watershed Management Studies
- Aquatic Ecosystems and Phytoplankton Dynamics
- Hydrology and Sediment Transport Processes
- Geology and Paleoclimatology Research
- Freshwater macroinvertebrate diversity and ecology
- Isotope Analysis in Ecology
- Linguistic research and analysis
- Wastewater Treatment and Nitrogen Removal
- Physics and Engineering Research Articles
- Historical, Literary, and Cultural Studies
- Methane Hydrates and Related Phenomena
- History and Theory of Mathematics
- Protist diversity and phylogeny
- Groundwater and Isotope Geochemistry
- Soil erosion and sediment transport
- Pesticide and Herbicide Environmental Studies
- Transboundary Water Resource Management
- German Literature and Culture Studies
- Water Treatment and Disinfection
- Peatlands and Wetlands Ecology
Oeschger Centre for Climate Change Research
2025
University of Bern
2025
Federal Institute of Hydrology
2015-2024
Bernstein Center for Computational Neuroscience Tübingen
2003-2013
Uppsala University
2006-2009
Leibniz Institute of Freshwater Ecology and Inland Fisheries
1999-2005
Leibniz Association
2003
University of Tübingen
1990-1998
University of Konstanz
1993
University of Bremen
1988
Fungi and bacteria are key agents in plant litter decomposition freshwater ecosystems. However, the specific roles of these two groups their interactions during process unclear. We compared growth patterns degradative enzymes expressed by communities fungi grown separately coexistence on Phragmites leaves. The displayed both synergistic antagonistic interactions. Bacteria grew better together with than alone. In addition, there was a negative effect fungi, which appeared to be caused...
Inland waters transport and transform substantial amounts of carbon account for ∼18% global methane emissions. Large reservoirs with higher areal release rates than natural contribute significantly to freshwater However, there are millions small dams worldwide that receive trap high loads organic can therefore potentially emit significant the atmosphere. We evaluated effect damming on emissions in a central European impounded river. Direct comparison riverine reservoir reaches, where...
Bacteria and fungi often share a common substrate, their spatial proximity in many environments has lead to either synergistic or antagonistic interactions. In this paper, the interaction of bacterial fungal decomposers from an aquatic environment was studied. We found indications tradeoff between growth tolerance towards bacteria. Fungal strains growing best absence bacteria were most severely affected by presence, while those less suppressed during co‐existence with had lower maximal rates...
1. The microbial metabolism of organic matter in rivers has received little study compared with that small streams. Therefore, we investigated the rate and location bacterial production a sixth‐order lowland river (Spree, Germany). To estimate contribution various habitats (sediments, epiphyton, pelagic zone) to total production, quantified these areal by bacteria. 2. Large areas bottom were characterized loose shifting sands relatively homogenous particle size distribution. Aquatic...
The differential ability of natural sediment biofilms to store and metabolize specific dissolved organic carbon (DOC) fractions was studied with a set perfusion experiments that combined chromatographic method for the analysis several DOC measurement bacterial abundance activity. High proportions low‐molecular‐weight substances polysaccharides low but significant humic were retained in cores after perfusion. Bacterial production these high (1.7—3.0 × 10 9 cells cm −3 0.7—12.0 µg C h −1 ,...
1. Over the course of this 17-month study, we assessed potential loss plankton (bacteria, algae, heterotrophic flagellates) to consumers (ciliates and rotifers) within mature biofilms established on natural substrata exposed main current River Rhine (Germany). Once a month, in flow cells bypass system Rhine, measured clearance rates biofilm-associated different groups plankton. 2. Ciliates were most dominant consumers, among which planktivorous groups, particularly peritrichs (in spring...
Knowledge about long-term dynamics of phytoplankton in river ecosystems as well the physical and chemical drivers that potentially control plankton is essential for predicting future developments, e.g. response to global climate change. The present study analyzes trends biomass shifts timing spring blooms observed large rivers Rhine Elbe from 1990–2009 1994–2009, respectively, factors regulating biomass. While was high (seasonal mean chlorophyll-a concentration: 62 µg/L) showed an increasing...
Recent advances in molecular biomonitoring open new horizons for aquatic ecosystem assessment. Rapid and cost-effective methods based on organismal DNA or environmental (eDNA) now offer the opportunity to produce inventories of indicator taxa that can subsequently be used assess biodiversity ecological quality. However, integration these DNA-based into current monitoring practices is not straightforward, will require coordinated actions coming years at national international levels. To plan...
Blooms of Prymnesium parvum, a unicellular alga globally distributed in marine and brackish environments, frequently result massive fish kills due to the production toxins called prymnesins by this haptophyte. In August 2022, harmful algal bloom (HAB) species occurred lower Oder River (Poland Germany), which caused mass mortalities other organisms. This HAB was linked low discharge mining activities that significant increase salinity. context, we report on molecular detection screening...
Abstract Rivers and floodplains provide many regulating, provisioning cultural ecosystem services (ES) such as flood risk regulation, crop production or recreation. Intensive use of resources hydropower production, construction detention basins intensive agriculture substantially change ecosystems may affect their capacity to ES. Legal frameworks the European Water Framework Directive, Bird Habitats Directive Floods already address various uses interests. However, management is still...
Harmful algae blooms are a rare phenomenon in rivers but seem to increase with climate change and river regulation. To understand the controlling factors of cyanobacteria that occurred between 2017 2020 over long stretches (> 250 km) regulated Moselle River Western Europe, we measured physico-chemical biological variables compared those long-term dataset (1997-2016). Cyanobacteria (Microcystis) dominated phytoplankton community late summers 2017-2020 (cyano-period) up 110 µg Chlorophyll-a/L,...
We compared the longitudinal plankton development in two large rivers Rhine and Elbe by means of four Lagrangian sampling campaigns performed within time span 2009–2011. The revealed low chlorophyll concentrations along a long river stretch (Rhine-km 170 to 854) with maximum values below 5 µg L−1 2010. In contrast, (Elbe-km 4 582) showed high longitudinally increasing maximal 174 2009 123 2011. Additional samples benthic bivalves stretches densities filter feeders that could potentially...
Organic carbon drives key processes in estuaries and rivers like (micro)biological production, oxygen consumption, transport of pollutants, the flocculation/agglomeration suspended particulate matter. The OrgCarbon project aims for an in‑depth characterization organic field samples by using both established innovative methods. Oxygen microbial respiration, potential sorption origin composition matter will be determined. By testing a variety cross-disciplinary methods, we aim to...
Abstract During the transition from Last Glacial Maximum (LGM) to Holocene, atmospheric N 2 O mole fraction increased by 80 nmol mol −1 . Using ice core measurements of isotopomer ratios, we show that this increase was driven increases in both nitrification and denitrification, with relative partitioning between production pathways depending on assumed isotopic end‐member source signatures. Similarly, also attribute a 35 during Heinrich Stadial 4/Dansgaard Oeschger 8 (HS4/DO8)...
Bacterial abundance, biomass, and activity were determined in the hyporheic zone of a third-order mountain stream (Steina, Black Forest, Germany). Two layers sediment biofilm analysed separately: POM which was loosely associated to surfaces (LAPOM), strongly (SAPOM). Abundance, bacteria correlated with amount LAPOM sediments. In October, mean bacterial abundance 7.2 x 10 8 /cm 3 showed significant vertical gradient. Mean biomass amounted 2.7 g C for standard volume 1 m 2 area 40 cm depth....
ABSTRACT Bacterial production is a key parameter for the understanding of carbon cycling in aquatic ecosystems, yet it remains difficult to measure many habitats. We therefore tested applicability [ 14 C]leucine incorporation technique measurement bulk bacterial various habitats lowland river ecosystem. To evaluate method, we determined (i) extraction efficiencies protein from sediments, (ii) substrate saturation leucine biofilms on plants (epiphyton), and pelagic zone, (iii) activities at...
Abstract Background Fecal indicator organisms such as Escherichia coli , enterococci, and coliphages are important to assess, monitor, predict microbial water quality in natural freshwater ecosystems. To improve predictive modelling of fecal indicators surface waters, it is vital assess the influence autochthonous allochthonous environmental factors on riverine systems. better understand how conditions fate under varying weather conditions, interdependencies parameters concentrations E....