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- European Multi Lake Survey (2)
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Institute
Insight into how environmental change determines the production and distribution of cyanobacterial toxins is necessary for risk assessment. Management guidelines currently focus on hepatotoxins (microcystins). Increasing attention is given to other classes, such as neurotoxins (e.g., anatoxin-a) and cytotoxins (e.g., cylindrospermopsin) due to their potency. Most studies examine the relationship between individual toxin variants and environmental factors, such as nutrients, temperature and light. In summer 2015, we collected samples across Europe to investigate the effect of nutrient and temperature gradients on the variability of toxin production at a continental scale. Direct and indirect effects of temperature were the main drivers of the spatial distribution in the toxins produced by the cyanobacterial community, the toxin concentrations and toxin quota. Generalized linear models showed that a Toxin Diversity Index (TDI) increased with latitude, while it decreased with water stability. Increases in TDI were explained through a significant increase in toxin variants such as MC-YR, anatoxin and cylindrospermopsin, accompanied by a decreasing presence of MC-LR. While global warming continues, the direct and indirect effects of increased lake temperatures will drive changes in the distribution of cyanobacterial toxins in Europe, potentially promoting selection of a few highly toxic species or strains.
Under ongoing climate change and increasing anthropogenic activity, which continuously challenge ecosystem resilience, an in-depth understanding of ecological processes is urgently needed. Lakes, as providers of numerous ecosystem services, face multiple stressors that threaten their functioning. Harmful cyanobacterial blooms are a persistent problem resulting from nutrient pollution and climate-change induced stressors, like poor transparency, increased water temperature and enhanced stratification. Consistency in data collection and analysis methods is necessary to achieve fully comparable datasets and for statistical validity, avoiding issues linked to disparate data sources. The European Multi Lake Survey (EMLS) in summer 2015 was an initiative among scientists from 27 countries to collect and analyse lake physical, chemical and biological variables in a fully standardized manner. This database includes in-situ lake variables along with nutrient, pigment and cyanotoxin data of 369 lakes in Europe, which were centrally analysed in dedicated laboratories. Publishing the EMLS methods and dataset might inspire similar initiatives to study across large geographic areas that will contribute to better understanding lake responses in a changing environment.
Insight into how environmental change determines the production and distribution of cyanobacterial toxins is necessary for risk assessment. Management guidelines currently focus on hepatotoxins (microcystins). Increasing attention is given to other classes, such as neurotoxins (e.g., anatoxin-a) and cytotoxins (e.g., cylindrospermopsin) due to their potency. Most studies examine the relationship between individual toxin variants and environmental factors, such as nutrients, temperature and light. In summer 2015, we collected samples across Europe to investigate the effect of nutrient and temperature gradients on the variability of toxin production at a continental scale. Direct and indirect effects of temperature were the main drivers of the spatial distribution in the toxins produced by the cyanobacterial community, the toxin concentrations and toxin quota. Generalized linear models showed that a Toxin Diversity Index (TDI) increased with latitude, while it decreased with water stability. Increases in TDI were explained through a significant increase in toxin variants such as MC-YR, anatoxin and cylindrospermopsin, accompanied by a decreasing presence of MC-LR. While global warming continues, the direct and indirect effects of increased lake temperatures will drive changes in the distribution of cyanobacterial toxins in Europe, potentially promoting selection of a few highly toxic species or strains.
Der Beteiligungsimperativ
(2023)
Spätestens seit den 1990-er Jahren erscheint der Begriff Beteiligung in diversen gesellschaftlichen Bereichen als allgemein anerkannter Imperativ, der von unterschiedlichen Akteur*innen als Allheilmittel angepriesen wird. Doch wenn Beteiligung proklamiert wird, bedeutet das mitnichten eine Garantie für gesellschaftliche Teilhabe. Mit Hilfe einer dispositivanalytischen Untersuchung von top-down Beteiligungsmaßnahmen in der Berliner Quartiersentwicklung zeigt Magdalena Otto, wie der Begriff Beteiligung verschiedenartig anschlussfähig ist und dadurch eine kaum hinterfragte Legitimationskraft ausstrahlt. Im Zentrum der hier entwickelten Theorie über den Beteiligungsimperativ steht die Rekonstruktion von vier idealtypisch zu verstehenden Deutungsmustern zur Legitimation von Beteiligungsmaßnahmen sowie ihre intendierten und unbeabsichtigten Folgen. Der konstatierte Beteiligungsimperativ zeigt sich dabei als eine auf Aktivierung setzende, neoliberale Gouvernementalität in Reaktion auf städtische Segregations- und Marginalisierungsprozesse, die Krise des Kommunalstaats und damit einhergehende veränderte Steuerungserfordernisse für Regierungshandeln.