A5080462565- Marine and coastal ecosystems
- Microbial Community Ecology and Physiology
- Isotope Analysis in Ecology
- Soil and Water Nutrient Dynamics
- Marine Biology and Ecology Research
- Peatlands and Wetlands Ecology
- Atmospheric and Environmental Gas Dynamics
- Hydrology and Watershed Management Studies
- Marine and fisheries research
- Coastal wetland ecosystem dynamics
- Methane Hydrates and Related Phenomena
- Aquatic Ecosystems and Phytoplankton Dynamics
- Freshwater macroinvertebrate diversity and ecology
- Marine Bivalve and Aquaculture Studies
- Fish Ecology and Management Studies
- Protist diversity and phylogeny
- Geology and Paleoclimatology Research
- Hydrocarbon exploration and reservoir analysis
- Soil erosion and sediment transport
- Soil Carbon and Nitrogen Dynamics
- Aquatic Invertebrate Ecology and Behavior
- Ocean Acidification Effects and Responses
- Impact of Light on Environment and Health
- Environmental DNA in Biodiversity Studies
- Gut microbiota and health
Universitätsmedizin Greifswald
2024
Leibniz Institute of Freshwater Ecology and Inland Fisheries
2013-2022
Charité - Universitätsmedizin Berlin
2022
Leibniz Centre for Agricultural Landscape Research
2013-2017
Leibniz Association
2015
Uppsala University
2006-2011
Observatoire Océanologique de Banyuls-sur-Mer
2009
Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung
2003
Abstract Ecological functions of fungal and bacterial decomposers vary with environmental conditions. However, the response these to particulate organic matter (POM) quality, which varies widely in aquatic ecosystems, remains poorly understood. Here we investigated how POM pools substrates different qualities determine relative contributions fungi bacteria terrigenous carbon (C) turnover. To this end, surface sediments were incubated algae and/or leaf litter. 13C stable-isotope measurements...
Abstract. Stream networks have recently been discovered to be major but poorly constrained natural greenhouse gas (GHG) sources. A fundamental problem is that several measurement approaches used without cross-comparisons. Flux chambers represent a potentially powerful methodological approach if robust and reliable ways use on running water can defined. Here we compare the of anchored freely drifting various streams with different flow velocities. The study clearly shows (1) enhance...
An increasing proportion of the Earth's surface is illuminated at night. In aquatic ecosystems, artificial light night (ALAN) may influence microbial communities living in sediments. These are highly diverse and play an important role global carbon cycle. We combined field laboratory experiments using sediments from agricultural drainage system to examine how ALAN affects alters mineralization. Two identical infrastructures were installed parallel a ditch before start experiment. DNA...
We investigated sediment bacterial metabolism in eight lakes with different inputs of allochthonous and autochthonous organic carbon south‐central Sweden. Sediment production, mineralization, biomass were measured seasonally along a lake depth gradient water characteristics. was primarily controlled by temperature but also the quality origin carbon. Metabolism positively correlated to measures influence on carbon, did not show similar increase increasing input Hence, contrast what is...
Abstract Floating macrophytes, including water hyacinth ( Eichhornia crassipes ), are dominant invasive organisms in tropical aquatic systems and they may play an important role modifying the gas exchange between atmosphere. However, these underrepresented global datasets of greenhouse (GHG) emissions. This study investigated carbon (C) turnover GHG emissions from a small (0.6 km 2 ) water-harvesting lake South India analysed effect floating macrophytes on We measured dioxide (CO methane (CH...
Abstract. Dissolved organic carbon (DOC) concentrations – mainly of terrestrial origin are increasing worldwide in inland waters. Heterotrophic bacteria the main consumers DOC and thus determine temporal dynamics availability for higher trophic levels. Our aim was to study bacterial (C) turnover with respect quantity chemical quality using both allochthonous autochthonous sources. We incubated a natural community C (13C-labeled beech leachate) increased pulses (intermittent occurrence matter...
Abstract Drought duration and intensity are expected to increase with global climate change. How changes in water availability temperature affect the combined plant–soil–microorganism response remains uncertain. We excavated soil monoliths from a beech ( Fagus sylvatica L.) forest, thus keeping understory plant–microbe communities intact, imposed an extreme event, consisting of drought and/or single heat‐pulse followed microbial community dynamics over time period 28 days. During treatment,...
Due to climate change, many lakes in Europe will be subject higher variability of hydrological characteristics their littoral zones. These different regimes might affect the use allochthonous and autochthonous carbon sources. We used sandy sediment microcosms examine effects (wet, desiccating, wet-desiccation cycles) on turnover. (13)C-labelled particulate organic was trace estimate uptake into bacterial biomass (via phospholipid fatty acids) respiration. Microbial community changes were...
Methane (CH4) emissions from small rivers and streams, particularly via ebullition, are currently under-represented in the literature. Here, we quantify methane effluxes drivers a small, Northern European river. fluxes comparable to those tropical aquatic systems, with average of 320 mg CH4 m–2 d–1. Two important flux variations were identified studied system: 1) temperature-driven sediment ebullition 2) flow-dependent contribution suspected be hydraulic exchange adjacent wetlands side-bays....
In aquatic systems, terrestrial dissolved organic matter (t‐DOM) is known to stimulate bacterial activities in the water column, but simultaneous effects of autumnal leaf input on column and sediment microbial dynamics littoral zones lakes remain largely unknown. The study's objective was determine litter metabolism sediment, subsequently, consequences for carbon cycling food web dynamics. Therefore, late fall, we simultaneously measured zone a temperate shallow lake after adding particulate...
We used phospholipid fatty acids (PLFA) to determine microbial biomass and community structure in the sediments of eight boreal lakes with different loadings allochthonous organic carbon total phosphorus (TP) water during course a year. The concentration PLFA, an estimate biomass, depended more on TP, proxy for pelagic primary production, but not dissolved carbon, terrestrial input. composition PLFAs varied considerably over time, demonstrating seasonal dynamics composition. When PLFA...
Landscapes can be viewed as spatially heterogeneous areas encompassing terrestrial and aquatic domains. To date, most landscape carbon (C) fluxes have been estimated by accounting for ecosystems, while ecosystems largely neglected. However, a robust assessment of C on the scale requires estimation within between both components. Here, we compiled data from literature across air–water interface various We simulated emissions uptake five different scenarios which represent gradient increasing...
Across a landscape, aquatic-terrestrial interfaces within and between ecosystems are hotspots of organic matter (OM) mineralization. These characterized by sharp spatio-temporal changes in environmental conditions, which affect OM properties thus control mineralization other transformation processes. Consequently, the extent movement at across is crucial determining turnover carbon (C) cycling landscape scale. Here, we propose expanding current concepts aquatic terrestrial ecosystem sciences...
The origin of organic C supporting zoobenthic communities in 8 boreal lakes with different concentrations dissolved (DOC) was assessed by stable-isotope analysis. Profundal zoobenthos depleted 13C compared to littoral zoobenthos, and this difference increased decreasing DOC concentration. δ13C suggested reliance on benthic algae, whereas profundal could be explained contributions from allochthonous autochthonous sources. In deeper lakes, diets also included processed methanotrophic bacteria....
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 325:121-135 (2006) - doi:10.3354/meps325121 Aggregations of Arctic deep-sea scavengers at large food falls: temporal distribution, consumption rates and population structure Katrin Premke1,2,*, Michael Klages1, Wolf E. Arntz1 1Alfred Wegener Institute for Polar Research, Am Handelshafen 12, 27570 Bremerhaven,...
The presence of free gas in sediments and ebullition events can enhance the pore water transport solute exchange across sediment–water interface. However, we experimentally theoretically document that counteract this enhancement effect. apparent diffusivities (Da) Rhodamine WT bromide containing 8–18% (Da,YE) were suppressed by 7–39% compared to control (no gas) (Da,C). measured ratios Da,YE:Da,C well within range predicted a theoretical soil model for gas-bearing soils. Whereas voids reduce...
Understanding interrelations between an environment's hydrological past and its current biogeochemistry is necessary for the assessment of biogeochemical microbial responses to changing conditions. The question how previous dry-wet events determine contemporary state addressed in this study. Therefore, sediments exposed atmosphere areas with a different within one kettle hole, i.e. (1) predominantly inundated pond center, (2) margin frequently desiccated longer periods (3) intermediate zone,...