Katrin Teubner

University of Vienna | UniWien · Dept. Functional & Evolutionary Ecology Faculty of Life Sciences

The seasonal dynamics of cyanobacterial and diatom assemblages in 11 water bodies along a meso- to hypertrophic gradient were compared. The cyanobacterial and diatom communities are charac- terised according to representative species of each algal class, selected by data reduction following prin- cipal component analyses and discriminant analysis....

The perspective on water transparency changed since the early days of limnology from being a physical parameter of optical water property to an ecological indicator tracking algal turbidity due to eutrophication or an overall success of sustained lake restoration in the late 60ies to 80ies. In modern cities, where ecosystems are commonly deteriorat...

Macrophytes play an important role in shallow lakes if large standing crop can be achieved. Here we stress the role of submerged macrophytes for benthic-pelagic coupling in the shallow oxbow lake Alte Donau (Austria) during restoration triggered by sufficient light availability (12% surface ambient light, photic>12% depth, z o p t i m u m ) in both...

Long-term ecological research of deep Lake Mondsee covers over more than six decades of phytoplankton observation. According to our study, phytoplankton groups of various phenological traits are suitable to address the impact of two major environmental stressors: nutrient surplus by eutrophication from 1968 to 1998 and warming by climate change. He...

Addressing complex interactions within water, energy, and food (WEF) resources, innovative tools for in-depth analysis and decision-making are imperative. This study introduces chorematic focus maps (CFMs) as a groundbreaking method to visualize and tackle the WEF nexus’s complexities, focusing specifically on the Danube Delta Biosphere Reserve (DD...

Managing Water, Energy, and Food (WEF) resources within socio‐environmental systems demands innovative strategies that provide decision‐makers with actionable insights. This article explores the challenges and potential solutions of employing Focus Maps and choremes as a novel approach for assessing anthropogenic impacts and enhancing the visualiza...

The International Association for Danube Research (IAD) was founded in 1956 to promote transboundary exchange in limnology and river management across the ‘Iron Curtain’. This was a necessity to tackle environmental problems, focusing first on pollution. After the political and socio-economic changes in 1989/1990, the IAD concentrated gradually on...

A network system of online-measurement of water quality for the water bodies Lake Neusiedl and soda pans has been installed in 2017, recording raw data at a three-minute time interval. Peak values and the range between maximum-minimum values on a daily basis on the one hand and the annual development of daily means with seasons on the other hand ar...

Exposure to 12% lake surface ambient light is assumed to indicate the lake depth at which underwater light availability is supportive for optimum growth of primary producers.

Water transparency expressed by Secchi depth , underwater light attenuation and depth of optimum light availability at 12% surface ambient light

Macrozoobenthos and host plants: Stands of submerged macrophytes provide a valuable habitat for phytal invertebrate species in Alte Donau

Sediment P-concentration and P-release

Die durch den Menschen bedingte Einbringung von Nährstoffen in die Gewässer Eutrophierung) ist oft an eine Massenentwicklung des Phytoplanktons gekoppelt. Es zeigt sich darüber hinaus die Tendenz, dass bei zunehmender Eutrophierung der Anteil der Cyanobakterien am Phytoplankton zunimmt. Detaillierte Untersuchungen haben ergeben, dass für viele Cyan...

The Lake Neusiedl area near Vienna (Austria) has been of scientific interest for a long time. Based on the number of publications, research activity on terrestrial and aquatic ecosystems increased from 1960-1990 and declined thereafter. More interesting is the long-term change in research topics, which reflects the state of science and the impact o...

Massive Eingriffe in den Naturhaushalt des Neusiedlers See-Seewinkel (Burgenland, Österreich) haben in den vergangenen Jahrzehnten die Salzlacken des Seewinkels sowie den Neusiedler See bedroht. Durch zahlreiche Entwässerungsmaßnahmen zur Gewinnung landwirtschaftlich nutzbarer Flächen, durch die steigende Entnahme von Grundwasser zur Bewässerung un...

Suppl information about: Map of coring sites in Lake Neusiedl, Fallout radionuclide concentrations in the core taken from Lake Neusiedl, Radiometric chronology of the core collected from Lake Neusiedl. List of the diatom taxa occurring with RA ≥0.05% in at least one sediment sample that were used for the NMDS analyses and the reconstruction of la...

Lake Neusiedl, the largest steppe lake in Europe, is particularly sensitive to climate variations due to its extreme shallowness (zmax = 1.8 m) and low ratio of catchment to lake area (3.5 : 1). Changes in water budget, salinity and turbidity have key implications for the lake’s ecology and management. Here, we present a multi-proxy palaeolimnologi...

Water transparency is identified as a key parameter which is important far beyond how we see it in limnology. It is the only parameter that the public can use by human perception for assessing the water quality or the progress of a lake restoration. In turn, a good status of water transparency close to ecosystem reference conditions attracts public...

Water clarity is quantified for more than 200 years by the visibility of a disk lowered under water. The perspective on water transparency, however, changed since the early days of limnology from being a physical parameter of optical water property to an ecological indicator tracking algal turbidity due to man-made nutrient addition (eutrophication...

Productivity estimates for phytoplankton, littoral algae, submersed macrophytes and emergent vegetation are assessed for freshwater ecosystems. Largely based on the ecosystem concept, information is gathered from literature and own observations. Methods and techniques for the assessment of production are outlined. Biocenoses living among habitats w...

Microbial planktonic communities are the basis of food webs in aquatic ecosystems since they contribute substantially to primary production and nutrient recycling. Network analyses of DNA metabarcoding data sets emerged as a powerful tool to untangle the complex ecological relationships among the key players in food webs. In this study, we evaluate...

A hosszútávú szocioökológiai kutatások egyre nagyobb figyelmet kapnak, és gyakran nevezik őket az „adatbányászat” tudományos kezdetének és a „nagy adatok” hozzáadott értékének. Minél összetettebb egy adatbázis és minél hosszabbak az idősorok, annál nagyobb szükség van a hosszú távú és a legfrissebb adatok rögzítésének megfelelő rendszerezésére anna...

Long-term socio-ecological research raised increasing awareness and is often described as scientific initiative of "data mining" and superimposed assessment of "big data". The more divers the data base is and the longer the time series records are, the more emphasis is seen on well organizing long-term and recent data recording, to make data freely...

INTERREG Österreich-Ungarn Projekt Vogelwarte Madárvárta 2, Projektnummer ATHU2; Sub-package B1.5.1 aimed at "Recording and assessing of raw data from on-line measuring stations" of large shallow soda lake "Lake Neusiedl" and it's soda pans, the temporary aquatic habitats of the National Park "Lake Neusiedl - Seewinkel", Austria; Long-term Ecologic...

Book review

Calcium (Ca) is an essential element for almost all living organisms. Here, we examined global variation and controls of freshwater Ca concentrations, using 440 599 water samples from 43 184 inland water sites in 57 countries. We found that the global median Ca concentration was 4.0 mg L−1 with 20.7% of the water samples showing Ca concentrations ≤...

Stadt und Land - Gewässer im Wandel: Gewässer prägen die Landschaft und gestalten auch das Bild unserer Städte und Gemeinden. Im urbanen Raum müssen Fließgewässer unterschiedliche Funktionen erfüllen. Diese Funktionen, so zeigt die Geschichte, unterliegen einem historischen Wandel, der von der Beziehung Mensch-Wasser geprägt ist. Obgleich die Gewäs...

Benthic invertebrates were used as bioindicators to document the effect of restoration measures in the backwater Alte Donau in Vienna, a former side-arm of the Danube. The study covers four periods of lake management: (1): the mesotrophic year before eutrophication (1987), (2): the 2 years of chemical iron chloride treatment aimed at the phosphate...

Here we report on a 25-year long-term sequence of measures to return a deteriorated recreational urban lake, Alte Donau in Vienna to acceptable water quality. Metropolitan waters require focused ecosystem management plans and intensive in-lake efforts. We explored physico-chemical conditions, food web from viruses to fish and water birds, the sedim...

Chapter 11: Lake restoration is commonly assessed by changes in water transpar-ency, nutrients and biomass of phytoplankton, while information about changes in zooplankton that is triggered by lake management is often missing. In our 19-year study we used rotifers and crustaceans to document the effect of restoration mea-sures on zooplankton in the...

Chapter 9: The long-term phytoplankton study in groundwater-seepage lake Alte Donau, a former side-arm of the Danube River in Vienna, covers four main lake treatment periods (1-4) from 1993 to 2014. During hypertrophic conditions with annual total phosphorus (TP) concentrations of 50-70 μg L and mean summer phytoplankton biovolume of 18-24 mm L bef...

Intensively used urban water bodies are vulnerable to eutrophication. The shallow lake Alte Donau (Vienna) can be seen as an example for the extent of anthropogenic influence. Human impacts paired with changes in environmental conditions gave way to eutrophication processes in Alte Donau. Due to the great public interest restoration concepts and su...

Intensively used urban water bodies are vulnerable to eutrophication. The shallow lake Alte Donau (Vienna) can be seen as an example for the extent of anthropogenic influence. Human impacts paired with changes in environmental conditions gave way to eutrophication processes in Alte Donau. Due to the great public interest restoration concepts and su...

Lakes are vital components of the landscape that provide important ecosystem services. They act as sentinels of change, integrating information from atmospheric, terrestrial, and hydrological processes. To support sustainable lake management, lakes must be monitored to provide physical, chemical, and biological information. Monitoring strategies ra...

The book provides a variety of strategies to restore and manage deteriorated recreational urban waters; broadens the understanding of the importance of all trophic levels of the food-web for successful rehabilitation and implementation of landscape architecture for an attractive recreational site. It clearly demonstrates that long-term efforts are...

As one of the fewremaining lakes that are freely connectedwith the Yangtze River, Poyang Lake exhibits large annualwater level (WL) fluctuations. In this study, weekly samples were collected at the north end of Poyang Lake from September 2011 to December 2012, and we investigated the mechanism of limnological responses to fluctuations in the WL. Th...

As one of the few remaining lakes that are freely connected with the Yangtze River, Poyang Lake exhibitslarge annual water level (WL)fluctuations. In this study, weekly samples were collected at the north endof Poyang Lake from September 2011 to December 2012, and we investigated the mechanism oflimnological responses tofluctuations in the WL. The...

Lesser Flamingo, the flagship species of saline wetlands of Africa and India, is a specialised feeder subsisting on microscopic cyanobacteria and algae. To establish the relationship between flamingo occurrence and food algal abundance and quality, an extensive microphyte survey in more than 150 sampling trips to seven countries over a 15-years per...

In this first worldwide synthesis of in situ and satellite-derived lake data, we find that lake summer surface water temperatures rose rapidly (global mean = 0.34°C decade−1) between 1985 and 2009. Our analyses show that surface water warming rates are dependent on combinations of climate and local characteristics, rather than just lake location, l...

In a combined laboratory and field study over 10 years, we investigated how two centric diatom species, Cyclotella baicalensis and Cyclotella minuta , have coexisted in the plankton of Lake Baikal in Siberia for over 100,000 years. The species differ substantially in cell size: C. baicalensis has some of the largest cells found in freshwater phytop...

Global environmental change has influenced lake surface temperatures, a key driver of ecosystem structure and function. Recent studies have suggested significant warming of water temperatures in individual lakes across many different regions around the world. However, the spatial and temporal coherence associated with the magnitude of these trends...

Global environmental change has influenced lake surface temperatures, a key driver of ecosystem structure and function. Recent studies have suggested significant warming of water temperatures in individual lakes across many different regions around the world. However, the spatial and temporal coherence associated with the magnitude of these trends...

As the title ‘Phytoplankton’ implies, we focus on the algal component of the plankton primarily in fresh-waters. At theoutset, a definition is given of the term plankton and what it contains, particularly for autotrophic organisms. Basic propertiesand strategies of the organisms living suspended in the water environment are outlined then. A brief h...

The cyanoprokaryote Planktothrix rubescens has been studied for over four decades in an alpine lake, Mondsee, Austria. We hypothesise that impacts of climate change can be distinguished from other environmental constraints controlling its population dynamics. During thermal stratification, P. rubescens formed a deep chlorophyll maximum in the metal...

Anthropogenic eUlrophication still is a major threat to inland waters in large parts of the world although re-oligotrophication has largely progressed in several regions. Climate change now poses a new risk effectively endangering inland waters. Impacts of climate change on inland waters are already well documented and established. Direct effects a...

Phytoplankton, an assemblage of suspended, primarily autotrophic single cells and colonies, forms part of the base of the pelagic food chain in lakes. The responses of phytoplankton to anthropogenic pressures frequently provide the most visible indication of a long-term change in water quality. Several attributes related to the growth and compositi...

In Europe, the effects of global warming are expected to be particularly acute in areas exposed to a more extreme continental climate. The climate change scenarios summarized in Chapter 2, this volume, suggest that the average summer temperatures in some areas of Central Europe could increase by as much as 6°C by 2071–2100. The associated projectio...

Introduction Aquatic macrophyte communities play a key role in aquatic ecosystems, structuring the water column, stabilising the substrate, providing microhabitats for other aquatic biota and contributing to the oxygen and carbon budget of the water body (Haslam 1978, Janauer & Dokulil 2006). They change in a more dynamic way than terrestrial veget...

Mitterwasser (Danube floodplain lake, Austria) can be considered as a hydrologically stable stream as it is protected from natural flooding by damming. Local hydraulic factors such as water velocity, substrate type and depth are likely to primarily determine the establishment of macrophyte assemblages in streams with low disturbance frequencies. En...

Production rates, abundance, chlorophyll a (Chl a) concentrations and pigment composition were measured for three size classes (<2μm, 2–11μm and >11μm) of phytoplankton from May to December 2000 in deep, mesotrophic, alpine lake Mondsee in Austria. The study focuses on differences among phytoplankton size fractions characterised by their surface ar...

In vivo delayed fluorescence (DF) and HPLC/CHEMTAX pigment analyses were used to investigate seasonal and depth distributions of phytoplankton in a deep alpine mesotrophic lake, Mondsee (Austria). Using chl a equivalents, we determined significant relationships with both approaches. Community structure derived from pigment ratios of homogenous samp...

Recent studies have highlighted the impact of the winter North Atlantic Oscillation (NAO) on water temperature, ice conditions, and spring plankton phenology in specific lakes and regions in Europe. Here, we use meta-analysis techniques to test whether 18 lakes in northern, western, and central Europe respond coherently to winter climate forcing, a...

Size related changes of phytoplankton biovolume and species composition have been analysed for forward and reverse regime shifts in a shallow, urban, seepage lake. As a consequence of changes in the hydrology, the pelagic switched from a clear water, macrophyte dominated state to a turbid stable phase with an abundant cyanobacterial population. Exp...

Allometric relationships of phytoplankton communities were studied on the basis of a five-year data-set in a deep oligotrophic alpine lake in Austria. The seasonal phytoplankton succession in Mondsee is characterised by diatoms during winter mixing and a distinct metalimnetic population of Planktothrix rubescens during stratification in summer. The...

Twenty to fifty years of annual mean deepwater (hypolimnetic) temperature data from twelve deep lakes spaced across Europe (2u959 Wt o 14u09E, 46u279 to 59u009N) show a high degree of coherence among lakes, particularly within geographic regions. Hypolimnetic temperatures vary between years but increased consistently in all lakes by about 0.1-0.2uC...

We followed the changes in the protist assemblage over an annual cycle at 3 sites and different depths of Traunsee in the Austrian Alps and quantified the variability of the ciliate assemblage along successive depth and time intervals, respectively. More than 60 ciliate species were identified alive and after quantitative protargol staining (QPS)....

The backwater system of the Danube in Linz (Upper Austria) is cut off from inundations by damming and impoundment and receives only backflow from the main river channel. Several mainly lentic water bodies remain as part of the local backwater system and house a number of endangered aquatic species. This study predicts the long-term change in macrop...

In einem Vorprojekt wurde der Index nach Brettum (1989) in seiner Originalversion und unter Verwendung der norwegischen Taxongewichte auf einen Datensatz aus Österreich angewendet. Aus den Ergebnissen ließ sich die grundsätzliche Tauglichkeit des Index ableiten. Es galt daher in einem nächsten Schritt, die Indexwerte der Arten aus den Brettum-Liste...

1. Measurements of total phosphorus (TP) concentrations since 1975 and a 50‐year time series of phytoplankton biovolume and species composition from Lake Mondsee (Austria) were combined with palaeolimnological information on diatom composition and reconstructed TP‐levels to describe the response of phytoplankton communities to changing nutrient con...

Report about phytoplankton in lakes responding to weather patterns.

Lake specific phytoplankton pattern and climate change