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Publications (20)
Wastewater treatment plants (WWTPs) are essential for maintaining a good water quality of surface waters.
However, WWTPs are also associated with water quality deterioration and hydro-morphological alteration.
Riverine communities respond to these stressors with changes in their community structure, abundance and
diversity. In this study, we used a...
Background
A variety of anthropogenic stressors influences the ecological status of rivers wordwide. Important stressors include elevated concentrations of nutrients, salt ions, heavy metals and other pollutants, habitat degradation and flow alteration. Some stressors tend to remain underrepresented in multiple-stressor studies, which in particular...
In Oberflächengewässern treten Substanzen in komplexen Stoffmischungen auf. Um zukünftig Mischungseffekte ergänzend in die Bewertung des Gewässerzustands einbeziehen zu können, hat das Landesamt für Natur, Umwelt und Verbraucherschutz (LANUV) ein Projekt zur Erfassung von Stoffmischungen durchgeführt. In dem Beispielgewässer Erft wurden akute Misch...
Background:
A vast number of chemical substances are released into the aquatic environment, leading to complex
chemical mixtures in surface waters. Current water quality assessments, however, are based on the risk assessment
of single substances. To consider potential mixture effects in water quality assessments, the North Rhine Westphalian
State A...
Mixture toxicity was assessed using extensive chemical monitoring data from the river Erft, its tributaries, and ten municipal waste water treatment plants (WWTPs) discharging into the Erft river basin. A Toxic Units (TU) approach was applied assuming concentration addition and using acute toxicity endpoints for algae, macrophytes, daphnia and fish...
In der vorliegenden Arbeit wurde der Einsatz von modellierten
Daten als Eingangsparameter für Stoffpriorisierungsverfahren
(Oberflächengewässer) evaluiert. Die Daten wurden mit verschiedenen
Modellierungstools (QSAR/ read-across) generiert.
Der Einsatz der modellierten Daten wurde für zehn Mikroschadstoffe
und zwei Priorisierungsverfahren getestet....
Populations of the European eel (Anguilla anguilla) are declining rapidly and are now considered below safe biological limits. High pollution levels are one of the possible reasons for this decline. Contaminant levels are also of concern with regard to human consumption. This study examined the contamination levels of eels from the North Rhine-West...
Background
The intensive use of veterinary medicines in livestock farming can potentially lead to a contamination of manure and digestates by antibiotics. In 2009 the Northrhein-Westfalian Agency for Nature, Environment and Consumer Protection (LANUV NRW) sought to determine the levels of the quantitatively most important veterinary antibiotics. Th...
The ciliate communities and their food sources were investigated in the anoxic hypolimnia of three lakes with differing water
chemistry. Bacterial biomass and, as a result, the biomass of bactenvorous ciliates were correlated with lake trophy. Additionally,
high sulfate and sulfide concentrations led to high bacterial biomass of sulfate reducers an...
The ciliated protozoan communities in the hypolimnion of a highly productive pond were investigated over two years. Three physiological groups could be distinguished: (a) microaerobic ciliates which tracked the oxic-anoxic boundary within the stratified water column; (b) anaerobic ciliates with endosymbiotic methanogens; and (c) anaerobes without e...
A new ciliate species (Cyclidium porcatum) is the first freshwater anaerobic scuticociliate to be cultured and described. It contains a unique tripartite structure consisting of hydrogenosomes (confirmed by cytochemical staining for hydrogenase), interspersed with methanogens (confirmed by auto fluorescence and in situ hybridisation with an archaeo...
Caenomorpha medusula was the dominant anaerobic ciliated protozoon in the anoxic water of a stratified freshwater lake. The population distribution was non-random, often with a peak in the middle of the hypolimnion. Abundance was closely correlated with numbers of the photosynthetic bacterium Thiopedia sp., and the latter was selectively eaten. The...
Thesis (doctoral)--Universität Konstanz, 1994. Includes bibliographical references (p. 77-91).
