Microplastics in Limnic Ecosystems - Investigation of Biological Fate and Effects of Microplastic Particles and Associated Contaminants in Zebrafish (Danio rerio)-
Abstract
Given the continually increasing global polymer production, environmental pollution from plastic debris has been widely perceived as an ecological threat with potentially adverse (eco-)toxicological impacts on various species and ecosystems. Especially small fragments of plastic debris measuring 1 ≤ 1000 µm in size − so-called microplastics (MPs) − can pose a risk to biota by physical or chemical hazards due to ingestion, sorption and transfer of anthropogenic environmental pollutants (e.g., pesticides, polycyclic aromatic hydrocarbons, pharmaceuticals). In recent years, there has been extensive research on the impact of streams and rivers as main entry routes for MPs into the marine environment. However, the evidence of adverse effects caused by the intake of MPs and the transfer of contaminants sorbed to MPs into freshwater ecosystems is still not conclusively documented. \nTherefore, this thesis addressed the impact of microplastic particles in limnic ecosystems by investigating the biological fate and effects of MPs and associated anthropogenic pollutants on different life stages of zebrafish (Danio rerio). To this end, effects of two common environmental pollutants (benzo(k)fluoranthene, chlorpyrifos) and two synthetic polymers (polystyrene, polymethyl methacrylate) were investigated with regard to alterations of complementary biomarkers during acute and chronic exposure, as well as the trophic transfer of MPs and MP-sorbed contaminants from invertebrate organisms to…
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