A5066628899- Aquatic Ecosystems and Phytoplankton Dynamics
- Marine and coastal ecosystems
- Cryospheric studies and observations
- Soil and Water Nutrient Dynamics
- Winter Sports Injuries and Performance
- Fish Ecology and Management Studies
- Climate change and permafrost
- Freshwater macroinvertebrate diversity and ecology
- Landslides and related hazards
- Isotope Analysis in Ecology
- Diatoms and Algae Research
- Aquatic Invertebrate Ecology and Behavior
- Methane Hydrates and Related Phenomena
- Arctic and Antarctic ice dynamics
- Hydrocarbon exploration and reservoir analysis
- Geology and Paleoclimatology Research
- Hydrology and Sediment Transport Processes
- Muscle Physiology and Disorders
- Coastal wetland ecosystem dynamics
- Cardiomyopathy and Myosin Studies
- Marine Biology and Ecology Research
- Ecology and biodiversity studies
- Hydrology and Watershed Management Studies
- Geophysical Methods and Applications
- Geological Studies and Exploration
Leibniz Institute of Freshwater Ecology and Inland Fisheries
2014-2025
Norwegian Polar Institute
2024
University of Vienna
2024
Leipzig University
2021-2024
Berlin Center for Genomics in Biodiversity Research
2023
Heinrich Heine University Düsseldorf
2022
Düsseldorf University Hospital
2022
Leibniz Association
2005-2021
Forschungsverbund Berlin
2021
Potsdam Institute for Climate Impact Research
2021
Summary 1. This synthesis examines 35 long‐term (5–35 years, mean: 16 years) lake re‐oligotrophication studies. It covers lakes ranging from shallow (mean depth <5 m and/or polymictic) to deep up 177 m), oligotrophic hypertrophic (summer mean total phosphorus concentration 7.5 3500 μ g L −1 before loading reduction), subtropical temperate (latitude: 28–65°), and lowland upland (altitude: 0–481 m). Shallow north‐temperate were most abundant. 2. Reduction of external (TP) resulted in lower...
This study examines a natural, rapid, fivefold increase in dissolved organic carbon (DOC) concentrations temperate shallow lake, describing the processes by which increased DOC resulted anoxic conditions and altered existing cycling pathways. High precipitation for two consecutive years led to rising water levels flooding of adjacent degraded peatlands. Leaching from flooded soils provided an initial (from 2010 mean 12 ± 1 mg L −1 maximum concentration 53 June 2012). Increasing levels, DOC,...
Submerged macrophytes play a key role in north temperate shallow lakes by stabilizing clear-water conditions. Eutrophication has resulted macrophyte loss and shifts to turbid conditions many lakes. Considerable efforts have been devoted lake restoration countries, but long-term success depends on stable recovery of submerged macrophytes. However, patterns vary widely remain be fully understood. We hypothesize that reduced external nutrient loading leads an intermediate state with clear...
To identify the seasonal pattern of nitrogen (N) and phosphorus (P) limitation phytoplankton in four different lakes, biweekly experiments were conducted from end March to September 2011. Lake water samples enriched with N, P or both nutrients incubated under two light intensities. Chlorophyll a fluorescence (Chla) was measured model selection procedure used assign bioassay outcomes categories. N limiting at some point. For shallow lakes there trend spring later year, while deep lake...
Abstract The effectiveness of controlling nitrogen (N) to manage lake eutrophication is debated. Long‐term, whole‐lake case studies are required determine whether diazotrophic cyanobacteria can fix sufficient N offset a reduction N‐inputs. We document the recovery shallow, productive Lake Müggelsee (Germany) over 37 yr (sampling interval 1–2 weeks) during decrease and phosphorus (P) loading 79% 69%, respectively. Nitrogen concentrations in responded immediately whereas P remained elevated...
Summary 1. The responses of nutrient concentrations, plankton, macrophytes and macrozoobenthos to a reduction in external loading contemporary climatic change were studied the shallow, moderately flushed Lake Müggelsee (Berlin, Germany). Weekly biweekly data from 1979 2003 compared with less frequently collected historical data. 2. A more than 50% both total phosphorus (TP) nitrogen (TN) hypertrophic (1979–90) eutrophic period (1997–2003) was followed by an immediate decline TN...
Regime shifts between clear and turbid water states are commonly found in shallow lakes. These attributed to a positive feedback clarity submerged macrophytes (underwater plants). Altering the retention time of may influence these interactions thus potentially reduce probability alternative stable states. Here we assessed effect on occurrence quality flushed lakes, chains lakes rivers using spatially explicit simple model. Our results indicate that increased flushing rapidly decreases range...
Ecological regime shifts and carbon cycling in aquatic systems have both been subject to increasing attention recent years, yet the direct connection between these topics has remained poorly understood. A four‐fold increase sedimentation rates was observed within past 50 years a shallow eutrophic lake with no surface in‐ or outflows. This change coincided an ecological shift involving complete loss of submerged macrophytes, leading more turbid, phytoplankton‐dominated state. To determine...
Summary Restoration of river hydromorphology often has limited detected effects on biota. One frequently discussed reason is that the restored length insufficient to allow populations develop and give room for geomorphological processes occur. We investigated ten pairs sections which one was a large project involving long, intensively section represented smaller restoration effort. The effect quantified by comparing each an upstream non‐restored section. sampled following response variables:...
Summary During eutrophication, submerged macrophytes in temperate E uropean shallow lakes are thought to undergo a sequence from seasonally ‘stable’ conditions characterised by high water clarity spring and summer, through ‘crashing’ where the is clear but dominated phytoplankton late ‘turbid’ with year‐round dominance. However, it not known whether this reversed during re‐oligotrophication contributes often observed delay macrophyte recovery lake restoration. We analysed long‐term (100...
Global climate change alters the relationship between temperature and light in aquatic ecosystems, which is expected to affect success of different phytoplankton species. To examine this, interactions temperature, photoperiod exposure (LE) (integral daily supply) on specific growth rates were analysed for Limnothrix redekei, Planktothrix agardhii (cyanobacteria), Nitzschia acicularis Stephanodiscus minutulus (diatoms). A model factor was developed based new (P. St. minutulus) previously...
Summary 1. Although macrophytes play a key role in the structure and functioning of lowland rivers, most basic plant, hydrodynamic sediment‐water interactions have only been described qualitatively. We therefore studied quantitatively, seasonal dynamics matter deposition mobilisation inside outside (free path) representative patch arrowhead, Sagittaria sagittifolia , River Spree, NE Germany, August 2006. Our situ study combined resuspension experiments, hydrodynamically calibrated erosion...
Summary Regime shifts are commonly associated with the loss of submerged macrophytes in shallow lakes; yet, effects this on whole‐lake primary productivity remain poorly understood. This study compares annual gross production ( GPP ) two shallow, eutrophic lakes different plant community structures but similar nutrient concentrations. Daily rates were substantially higher lake containing (586 ± 23 g C m −2 year −1 than featuring only phytoplankton and periphyton (408 ; P < 0.0001)....
We measured specific growth rates of Stephanodiscus minutulus, Nitzschia acicularis (diatoms), and Limnothrix redekei (cyanobacterium) under fluctuating constant light in semi‐continuous culture at 10°C, 15°C, 20°C photoperiods 6 h d −1 12 . Fluctuating regimes simulated regular vertical mixing lakes with a ratio euphotic to mixed depth (z eu : z mix ) 1 0.5 on cloudless day. Light fluctuations = decreased the S. minutulus , N. acicularis, L. by 18%, 33%, 29%, respectively, compared same...
Abstract Climate change elevates the threat of compound heat and drought events, with their ecological socioeconomic impacts exacerbated by human ecosystem alterations such as eutrophication, salinization, river engineering. Here, we study how multiple stressors produced an environmental disaster in a large European river, Oder River, where toxic bloom brackish-water planktonic haptophyte Prymnesium parvum (the “golden algae”) killed approximately 1000 metric tons fish most mussels snails....
Understanding the mechanisms driving community structure and dynamics is crucial in face of escalating climate change, including increasing incidences extreme weather. Cell size a master trait small organisms that subject to trade-off between resistance grazing competition for resources, thus holds potential explain predict response disturbances. Here, we aimed at determining whether cell can shifts phytoplankton communities following changes nutrient light conditions resulting from...
Elastic distortion of a structural element the actomyosin complex is fundamental to ability myosin generate motile forces. An elastic allows strain develop within (cross-bridge) before movement. Relief this then drives filament sliding, or more generally, movement cargo. Even with known crystal structure head, however, in which occurs remained unclear. To assign functional relevance various elements e.g., identify cross-bridge, we studied mechanical properties muscle fibers from patients...
Abstract The effects of the recent warming trend in many northern temperate lakes on species composition spring phytoplankton remain poorly understood, especially because a change nutrients has complicated efforts, and previous studies have defined according to calendar. We analysed data from 1979 2004 Lake Müggelsee (Berlin, Germany), using physical biological parameters define period. show that timing plankton events warm years led paradox lower mean water temperatures during growth...
Lake ecosystems are strongly linked to their terrestrial surroundings by material and energy fluxes across ecosystem boundaries. However, the contribution of particulate organic carbon (tPOC) from annual leaf fall lake food webs has not yet been adequately traced quantified. In this study, we conducted whole-lake experiments trace artificially added tPOC through two shallow lakes similar eutrophic status, but featuring alternative stable regimes (macrophyte rich vs. phytoplankton dominated)....
Abstract The applicability of algorithms for estimation phycocyanin (PC) concentration based on light spectral reflectance heavily depends the specific absorption pigment. But determination PC‐specific coefficient is not a straightforward task, as PC optical activity overlapped by chlorophylls. aim our study was to determine (625)—the at 625 nm, in samples with concentrations ranging from 0.5 mg m −3 126.4 and varying proportions chlorophylls , b c samples. effect subtracted total nm using...