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Diese Habilitationsschrift befasst sich mit den Auswirkungen von Schadstoffen auf Süßwasser-Ökosysteme und betrachtet dabei verschiedene Schadstofftypen (Pestizide, generelle organische Schadstoffe, Sanität) und biotische Endpunkte (taxonomische Gemeinschafsstruktur, merkmalsbezogene Gemeinschafsstruktur, Ökosystemfunktionen).
Die Habilitationsschrift besteht aus 12 peer-reviewed internationalen Publikationen zu diesen Themen. Alle Studien beruhen auf Daten aus Mesokosmen und Feldstudien, oder auf der Analyse von Daten des biologischen und chemischen Monitorings. Weitere Details zu den individuellen Publikationen finden sich in der englischen Zusammenfassung.
In Agrarlandschaften zählen Laufkäfer zu den weit verbreiteten Fressfeinden verschiedener Schädlinge, wie etwa von Nacktschnecken. Einflüsse von naturnahen Randstrukturen auf Laufkäfer und deren Potenzial zur natürlichen Schädlingsbekämpfung sind bekannt.
Der Einfluss von naturnahen Randstrukturen wurde auf randstrukturbewohnende Laufkäfer und Schnecken untersucht (Kapitel 2). Die Mehrzahl an Laufkäfern sowie Deroceras reticulatum präferierten Krautsäume, wohingegen Arion spp. vor allem in Gehölzen vorkam. Steigende Abundanzen von räuberischen Laufkäferarten und abnehmende Zahlen von Arion spp., gefördert durch einen hohen Anteil an Randstrukturen, lassen auf ein erhöhtes Potenzial zur Schneckenbekämpfung in strukturreichen Landschaften schließen.
Der Einfluss von naturnahen Randstrukturen wurde auf räuberische Laufkäfer und Schnecken in 18 Weizenfeldern getestet (Kapitel 3). Der Artenreichtum an karnivoren Laufkäfern stieg zusammen mit dem Anteil an Randstrukturen in der Landschaft, wobei deren Abundanz von kleinräumigen Effekten unbeeinflusst blieb. Die beiden Schädlinge zeigten unterschiedliche Muster, wobei Dichten von Arion spp. an Gehölzen in strukturarmen Landschaften am höchsten waren. D. reticulatum wurde weder durch lokale noch von großräumigen Effekten beeinflusst, was auf ihre Anpassung an Agrarlandschaften zurückzuführen ist. Die Ergebnisse lassen auf eine gesteigerte Kontrolle von Arion spp. durch Laufkäfer in strukturreichen Gebieten schließen.
Effekte von Randstrukturen und Bewirtschaftung wurden auf die Verteilung von Laufkäfern in 18 Kürbisfeldern getestet (Kapitel 4). Der Artenreichtum stieg mit Nähe zu den Randstrukturen, wobei Laufkäferabundanzen je nach Habitattyp unterschiedlich beeinflusst wurden. Die Bewirtschaftungsart hatte keinen Einfluss auf Laufkäfer und Landschaftsheterogenität beeinflusste nur Laufkäfer in ökologisch bewirtschafteten Feldern.
Prädationsexperimente von Schnecken und deren Eiern durch drei Laufkäferarten wurden im Labor in Einzel- und Zweierkonstellationen durchgeführt (Kapitel 5). Je nach Art wurden synergistische und additive Effekte gemessen. Generell erhöhen naturnahe Randstrukturen das Potenzial zur Schneckenbekämpfung durch Laufkäfer, was vor allem für Schnecken der Gattung Arion zählt. Es ist wichtig, einen bestimmten Anteil an naturnahen Randstrukturen in Agrarlandschaften bereitzustellen, da sie als Rückzugs-, Eiablage- und Überwinterungsorte fungieren und komplementäre Nahrungsressourcen bereitstellen.
The global problematic issue of the olive oil industry is in its generation of large amounts of olive mill wastewater (OMW). The direct discharge of OMW to the soil is very common which presents environmental problems for olive oil producing countries. Both, positive as well as negative effects on soil have been found in earlier studies. Therefore, the current study hypothesized that whether beneficial effects or negative effects dominate depends on the prevailing conditions before and after OMW discharge to soil. As such, a better understanding of the OMW-soil interaction mechanisms becomes essential for sustainable safe disposal of OMW on soil and sustainable soil quality.
A field experiment was carried out in an olive orchard in Palestine, over a period of 24 months, in which the OMW was applied to the soil as a single application of 14 L m-2 under four different environmental conditions: in winter (WI), spring (SP), and summer with and without irrigation (SUmoist and SUdry). The current study investigated the effects of seasonal conditions on the olive mill wastewater (OMW) soil interaction in the short-term and the long-term. The degree and persistence of soil salinization, acidification, accumulation of phenolic compounds and soil water repellency were investigated as a function of soil depth and time elapsed after the OMW application. Moreover, the OMW impacts on soil organic matter SOM quality and quantity, total organic carbon (SOC), water-extractable soil organic carbon (DOC), as well as specific ultraviolet absorbance analysis (SUVA254) were also investigated for each seasonal application in order to assess the degree of OMW-OM decomposition or accumulation in soil, and therefore, the persisting effects of OMW disposal to soil.
The results of the current study demonstrate that the degree and persistence of relevant effects due to OMW application on soil varied significantly between the different seasonal OMW applications both in the short-term and the long-term. The negative effects of the potentially hazardous OMW residuals in the soil were highly dependent on the dominant transport mechanisms and transformation mechanisms, triggered by the ambient soil moisture and temperature which either intensified or diminished negative effects of OMW in the soil during and after the application season. The negative effects of OMW disposal to the soil decreased by increasing the retention time of OMW in soil under conditions favoring biological activity. The moderate conditions of soil moisture and temperature allowed for a considerable amount of applied OMW to be biologically degraded, while the prolonged application time under dry conditions and high temperature resulted in a less degradable organic fraction of the OMW, causing the OMW constituents to accumulate and polymerize without being degraded. Further, the rainfall during winter season diminished negative effects of OMW in the soil; therefore, the risk of groundwater contamination by non-degraded constituents of OMW can be highly probable during the winter season.
Agricultural land-use may lead to brief pulse exposures of pesticides in edge-of-field streams, potentially resulting in adverse effects on aquatic macrophytes, invertebrates and ecosystem functions. The higher tier risk assessment is mainly based on pond mesocosms which are not designed to mimic stream-typical conditions. Relatively little is known on exposure and effect assessment using stream mesocosms.
Thus the present thesis evaluates the appliacability of the stream mesocosms to mimic stream-typical pulse exposures, to assess resulting effects on flora and fauna and to evaluate aquatic-terrestrial food web coupling. The first objective was to mimic stream-typical pulse exposure scenarios with different durations (≤ 1 to ≥ 24 hours). These exposure scenarios established using a fluorescence tracer were the methodological basis for the effect assessment of an herbicide and an insecticide. In order to evaluate the applicability of stream mesocosms for regulatory purposes, the second objective was to assess effects on two aquatic macrophytes following a 24-h pulse exposure with the herbicide iofensulfuron-sodium (1, 3, 10 and 30 µg/L; n = 3). Growth inhibition of up to 66 and 45% was observed for the total shoot length of Myriophyllum spicatum and Elodea canadensis, respectively. Recovery of this endpoint could be demonstrated within 42 days for both macrophytes. The third objective was to assess effects on structural and functional endpoints following a 6-h pulse exposure of the pyrethroid ether etofenprox (0.05, 0.5 and 5 µg/L; n = 4). The most sensitive structural (abundance of Cloeon simile) and functional (feeding rates of Asellus aquaticus) endpoint revealed significant effects at 0.05 µg/L etofenprox. This concentration was below field-measured etofenprox concentrations and thus suggests that pulse exposures adversely affect invertebrate populations and ecosystem functions in streams. Such pollutions of streams may also result in decreased emergence of aquatic insects and potentially lead to an insect-mediated transfer of pollutants to adjacent food webs. Test systems capable to assess aquatic-terrestrial effects are not yet integrated in mesocosm approaches but might be of interest for substances with bioaccumulation potential. Here, the fourth part provides an aquatic-terrestrial model ecosystem capable to assess cross-ecosystem effects. Information on the riparian food web such as the contribution of aquatic (up to 71%) and terrestrial (up to 29%) insect prey to the diet of the riparian spider Tetragnatha extensa was assessed via stable isotope ratios (δ13C and δ15N). Thus, the present thesis provides the methodological basis to assess aquatic-terrestrial pollutant transfer and effects on the riparian food web.
Overall the results of this thesis indicate, that stream mesocosms can be used to mimic stream-typical pulse exposures of pesticides, to assess resulting effects on macrophytes and invertebrates within prospective environmental risk assessment (ERA) and to evaluate changes in riparian food webs.
Systemische Neonicotinoide gehören zu den weltweit meist genutzten Insektiziden. Neben ihrer Anwendung in der Landwirtschaft werden sie zunehmend zur Bekämpfung von Baumschädlingen in
der Forstwirtschaft eingesetzt. Die im Herbst von Laubbäumen fallenden Blätter können allerdings
immer noch Neonicotinoide enthalten. Gelangen diese kontaminierten Blätter schließlich in
nahegelegene Bäche werden die wasserlöslichen Neonicotinoide wieder mobilisiert und somit
potenziell aquatische Nicht-Zielorganismen über die Wasserphase exponiert. Obwohl der Standardtestorganismus Daphnia magna (Crustacea; Cladocera) relativ unempfindlich gegenüber
Neonicotinoiden ist, sind viele andere aquatische Invertebraten bereits bei einer Exposition im ng/L- bis niedrigem μg/L-Bereich negativ beeinträchtigt. Besonders laubzersetzende Invertebraten (= Shredder) könnten, zusätzlich zu einer Exposition über die Wasserphase, durch den Eintrag von Neonicotinoid-kontaminiertem Laub in ein Fließgewässer negativ beeinträchtigt werden, da Laub für sie eine essentielle Nahrungsquelle darstellt. Jedoch erhielt dieser Expositionspfad im Zusammenhang mit aquatischen Shreddern und Neonicotinoid-kontaminiertem Pflanzenmaterial bisher kaum Aufmerksamkeit seitens der Forschung und findet keine Berücksichtigung in der aquatischen Umweltrisikobewertung. Das Hauptziel dieser Arbeit war daher (1) Neonicotinoidrückstände in Blättern zu quantifizieren sowie für Shredder relevante Expositionswege zu identifizieren, (2)
ökotoxikologische Effekte einer Exposition über die Wasserphase sowie über die Nahrung für zwei
Modell-Shredder Gammarus fossarum (Amphipoda) und Chaetopteryx villosa (Insecta) zu untersuchen, und schließlich (3) biotische und abiotische Faktoren zu betrachten, welche eine Exposition unter Feldbedingungen potenziell beeinträchtigen könnten.
Im Rahmen dieser Arbeit konnten Rückstände der Neonicotinoide Imidacloprid, Thiacloprid und
Acetamiprid in Blätter behandelter Schwarzerlen quantifiziert werden. Ein entwickeltes „Worst-Case
Modell“ prognostizierte niedrige Imidaclopridwasserkonzentrationen für einen Bach in welchen Imidacloprid-kontaminierte Blätter eingetragen werden. Jedoch konnte mit Hilfe des Modells die Aufnahme über die Nahrung als ein für aquatische Shredder relevanter Expositionspfad identifiziert werden. Der Konsum von Neonicotinoid-kontaminierten Blättern führte, bei gleichzeitiger Exposition über die Wasserphase (= kombinierte Exposition), in beiden Testorganismen zu stärkeren Effekten als die alleinige Exposition über die Wasserphase. Des Weiteren gelang es in einem weiteren Laborexperiment die beiden Expositionswege mittels einer Durchflussanlage zu separieren. Hierbei führte die separate Exposition von G. fossarum sowohl über die Nahrung (= Konsum von Thiaclopridkontaminierten Blättern) als auch über die Wasserphase zu vergleichbaren Effektgrößen. Zudem ließen sich die unter einer kombinierten Exposition beobachteten Effektgrößen weitestgehend mit dem Referenzmodell der „Unabhängigen Wirkung“ vorhersagen, was eine Wirkung auf unterschiedliche molekulare Zielorte vermuten lässt. Die durch Imidacloprid ausgelöste toxischen Effekte auf G. fossarum konnten schließlich durch eine Behandlung der Blätter mit UV-Strahlung (repräsentativ für Sonnenlicht) sowie durch Leaching in Wasser reduziert werden. Jedoch waren beide Shredder-Spezies nicht dazu in der Lage aktiv eine Aufnahme von Neonicotinoiden über die Nahrung zu vermeiden. Daher geht aus dieser Arbeit die Empfehlung hervor, bereits während der Registrierung von systemischen Pestiziden, auf nahrungsbedingte Effekte zu testen und dadurch aquatische Shredder als auch assoziierte Ökosystemfunktionen (z.B. Laubabbau) zu schützen.
The intention of this thesis was to characterise the effect of naturally occurring multivalent cations like Calcium and Aluminium on the structure of Soil Organic Matter (SOM) as well as on the sorption behaviour of SOM for heavy metals such as lead.
The first part of this thesis describes the results of experiments in which the Al and Ca cation content was changed for various samples originated from soils and peats of different regions in Germany. The second part focusses on SOM-metal cation precipitates to study rigidity in dependence of the cation content. In the third part the effects of various cation contents in SOM on the binding strength of Pb cations were characterised by using a cation exchange resin as desorption method.
It was found for soil and peat samples as well as precipitates that matrix rigidity was affected by both type and content of cation. The influence of Ca on rigidity was less pronounced than the influence of Al and of Pb used in the precipitation experiments. For each sample one cation content was identified where matrix rigidity was most pronounced. This specific cation content is below the cation saturation as expected by cation exchange capacity. These findings resulted in a model describing the relation between cation type, content and the degree of networking in SOM. For all treated soil and precipitate samples a step transition like glass transition was observed, determined by the step transition temperature T*. It is known from literature that this type of step transition is due to bridges between water molecules and organic functional groups in SOM. In contrast to the glass transition temperature this thermal event is slowly reversing after days or weeks depending on the re-conformation of the water molecules. Therefore, changes of T* with different cation compositions in the samples are explained by the formation of water-molecule-cation bridges between SOM-functional groups. No influence on desorption kinetics of lead for different cation compositions in soil samples was observed. Therefore it can be assumed that the observed changes of matrix rigidity are highly reversible by changing the water status, pH or putting agitation energy by shaking in there.
The ongoing loss of species is a global threat to biodiversity, affecting ecosystems worldwide. This also concerns arthropods such as insects and spiders, which are especially endangered in agricultural ecosystems. Here, one of the main causing factors is management intensification. In areas with a high proportion of traditionally managed grassland, extensive hay meadows that are cut only once per year can still hold high levels of biodiversity, but are threatened by conversion into highly productive silage grassland. The Westerwald mountain range, western Germany, is such a region. In this thesis, I compare the local diversity of bees, beetles, hoverflies, leafhoppers, and spiders of five grassland management regimes along a gradient of land-use intensity. These comprise naturally occurring grassland fallows, three types of traditionally managed hay meadows, and intensively used silage grassland. By using three different sampling methods, I recorded ground-dwelling, flower-visiting, and vegetation-dwelling species. The results show that in most cases species richness and diversity are highest on fallows, whereas variation among different managed grassland types is very low. Also, for most sampled taxa, fallows harbour the most distinct species assemblages, while that of other management regimes are largely overlapping. Management has the largest effect on species composition, whereas environmental parameters are of minor importance. Long-term grassland fallows seem to be highly valuable for arthropod conservation, even in a landscape with a low overall land-use intensity, providing structural heterogeneity. In conclusion, such fallows should be subsidized agri-environmental schemes, to preserve insect and spider diversity.
Agriculture covers one third of the world land area and has become a major source of water pollution due to its heavy reliance on chemical inputs, namely fertilisers and pesticides. Several thousands of tonnes of these chemicals are applied worldwide annually and partly reach freshwaters. Despite their widespread use and relatively unspecific modes of action, fungicides are the least studied group of pesticides. It remains unclear whether the taxonomic groups used in pesticide risk assessment are protective for non-target freshwater fungi. Fungi and bacteria are the main microbial decomposers converting allochthonous organic matter (litter) into a more nutritious food resource for leaf-shredding macroinvertebrates. This process of litter decomposition (LD) is central for aquatic ecosystem because it fuels local and downstream food webs with energy and nutrients. Effects of fungicides on decomposer communities and LD have been mainly analysed under laboratory conditions with limited representation of the multiple factors that may moderate effects in the field.
In this thesis a field study was conducted in a German vineyard area to characterise recurrent episodic exposure to fungicides in agricultural streams (chapter 2) and its effects on decomposer communities and LD (chapter 3). Additionally, potential interaction effects of nutrient enrichment and fungicides on decomposer communities and LD were analysed in a mesocosm experiment (chapter 4).
In the field study event-driven water sampling (EDS) and passive sampling with EmporeTM styrene-divinylbenzene reverse phase sulfonated disks (SDB disks) were used to assess exposure to 15 fungicides and 4 insecticides. A total of 17 streams were monitored during 4 rainfall events within the local application period of fungicides in 2012. EDS exceeded the time-weighted average concentrations provided by the SDB disks by a factor of 3, though high variability among compounds was observed. Most compounds were detected in more than half of the sites and mean and maximum peak (EDS) concentrations were under 1 and 3 µg/l, respectively. Besides, SDB disk-sampling rates and a free-software solution to derive sampling rates under time-variable exposure were provided.
Several biotic endpoints related to decomposers and LD were measured in the same sampling sites as the fungicide monitoring, coinciding with the major litter input period. Our results suggest that polar organic fungicides in streams change the structure of the fungal community. Causality of this finding was supported by a subsequent microcosm experiment. Whether other effects observed in the field study, such as reduced fungal biomass, increased bacterial density or reduced microbial LD can be attributed to fungicides remains speculative and requires further investigation. By contrast, neither the invertebrate LD nor in-situ measured gammarid feeding rates correlated with water-borne fungicide toxicity, but both were negatively associated with sediment copper concentrations. The mesocosm experiment showed that fungicides and nutrients affect microbial decomposers differently and that they can alter community structure, though longer experiments are needed to determine whether these changes may propagate to invertebrate communities and LD. Overall, further studies should include representative field surveys in terms of fungicide pollution and physical, chemical and biological conditions. This should be combined with experiments under controlled conditions to test for the causality of field observations.
Rivers play an important role in the global water cycle, support biodiversity and ecological integrity. However, river flow and thermal regimes are heavily altered in dammed rivers. These impacts are being exacerbated and become more apparent in rivers fragmented by multiple dams. Recent studies mainly focused on evaluating the cumulative impact of cascade reservoirs on flow or thermal regimes, but the role of upstream reservoirs in shaping the hydrology and hydrodynamics of downstream reservoirs remains poorly understood. To improve the understanding of the hydrodynamics in cascade reservoirs, long-term observational data are used in combination with numerical modeling to investigate the changes in flow and thermal regime in three cascade reservoirs at the upper reach of the Yangtze River. The three studied reservoirs are Xiluodu (XLD), Xiangjiaba (XJB) and Three Gorges Reservoir (TGR). In addition, the effects of single reservoir operation (at seasonal/daily time scale) on hydrodynamics are examined in a large tributary of TGR. The results show that the inflow of TGR has been substantially altered by the two upstream reservoirs with a higher discharge in spring and winter and a reduced peak flow in summer. XJB had no obvious contribution to the variations in inflow of TGR. The seasonal water temperature of TGR was also widely affected by the upstream two reservoirs, i.e., an increase in winter and decrease in spring, associated with a delay in water temperature rise and fall. These effects will probably be intensified in the coming years due to the construction of new reservoirs. The study also underlines the importance of reservoir operation in shaping the hydrodynamics of TGR. The seasonal dynamics of density currents in a tributary bay of TGR are closely related to seasonal reservoir operations. In addition, high-frequency water level fluctuations and flow velocity variations were observed in response to periodic tributary bay oscillations, which are driven by the diurnal discharge variations caused by the operation of TGR. As another consequence of operation of cascade reservoirs, the changes in TGR inflow weakened spring thermal stratification and caused warming in spring, autumn and winter. In response to this change, the intrusions from TGR occurred more frequently as overflow and earlier in spring, which caused a sharp reduction in biomass and frequency of phytoplankton blooms in tributary bays of TGR. This study suggests that high-frequency bay oscillations can potentially be used as an efficient management strategy for controlling algal blooms, which can be included in future multi-objective ecological conservation strategies.
In this thesis we examined the question whether personality traits of early child care workers influence process quality in preschool.
Research has shown that in educational settings such as preschool, pedagogical quality affects children’s developmental outcome (e.g. NICHD, 2002; Peisner-Feinberg et al., 1999). A substantial part of pedagogical quality known to be vital in this respect is the interaction between teacher and children (e.g., Tietze, 2008). Results of prior classroom research indicate that the teachers’ personality might be an important factor for good teacher-child-interaction (Mayr, 2011). Thus, personality traits might play a vital role for the interaction in preschool. Therefore, the aims of this thesis were to a) identify pivotal personality traits of child care workers, b) assess ideal levels of the identified personality traits and c) examine the relationship between pivotal personality traits and process quality. On that account, we conducted two requirement analyses and a video study. The results of these studies showed that subject matter experts (parents, child care workers, lecturers) partly agreed as to which personality traits are pivotal for child care workers. Furthermore, the experts showed high consensus with regard to the minimum, ideal and maximum personality trait profiles. Furthermore, child care workers whose profiles lay closer to the experts’ ideal also showed higher process quality. In addition, regression analyses showed that the child care workers’ levels of the Big Two (Communion and Agency) related significantly to their process quality.