Neonicotinoids are widely used pesticides whose harmful effects on biodiversity have been long recognized. This work analyzes the incidence and prevalence of five neonicotinoids in four different taxa of aquatic invertebrates in three sites of the Seyon River, in Switzerland. All samples analyzed were contaminated with at least one neonicotinoid, and two neonicotinoids found in the samples had been banned from use nine months prior to sampling: these facts highlight the substances’ ubiquity and high persistence in natural environments. The concentrations indicated a chronic exposure to neonicotinoids, except for one value which was ten times bigger than the others. These alarming results encourage further studies on the subject, in which the experimental methods developed for this work could be exploited.
The objective of this study was to find out whether microplastic particles can be found at 8 locations in the Upper Engadine with different population densities, types of land use, and distances to the source of the river Inn at Lake Lunghin, a remote location in a major European watershed.
A wooden, low-cost, light, easily transportable self-constructed LADI-trawl was used for sampling. Plastic residues were detected in all locations, and the found particles were assigned to 22 different types of plastics, showing that seemingly remote regions and sparsely populated areas are affected by microplastic pollution. The findings of this research are of key importance for alpine regions, as evidence of plastic was found at over 2400 meters above sea level.
Tardigrades are very small animals who belong to the taxon of Ecdysozoa, and are found in most water bodies, sediment and moss. They have developed the unique ability to react to rapidly changing environmental conditions by changing their physical characteristics and taking on different stages of resistance. Climate change not only has an influence on temperatures around the world, but it also affects the physical characteristics of different waters, which results in need of adaptation for all organisms living in aquatic ecosystems. The aim is to investigate the tolerance and vitality of Hypsibius exemplaris under the influence of different pH values and different dosages of UV-C light and thereby create a diagram for their tolerance and vitality for each experiment.
Littorella uniflora L. Asch. is an aquatic plant which is endangered in southern central Europe. Because of its sensitivity to environmental changes, it reflects the complexity of ecosystems along lake shores. In my study I examined the north shore of the upper Lake Zurich for the presence of L .u. and characterised the ecological conditions under which the species grows. I applied a broad spectrum of wide-ranging surveys including transects, comparisons of different sites, and soil and water analyses. These different ecological approaches enabled the identification of factors critical for the survival of the few remaining populations in Lake Zurich. They serve as a reference for the impact of human intervention on aquatic systems and biodiversity in its total.