Metaller i Vombsjön - Mygglarver som bioindikator för miljöövervakning

Sammanfattning: This study investigates concentrations of eight metals (Cu, Zn, Cd, Pb, Hg, Cr, Ni, As) in the freshwater resource Lake Vomb, located in the south of Sweden (Scania), and explores the potential use of deformed Chironomidae larvae as bioindicator. Sediment samples from six locations were analysed against threshold values from the Swedish Agency for Marine and Water Management and background values from the Swedish Environmental Protection Agency. Nickel (Ni) exhibited a significant departure, indicating contamination. Uncertainties regarding the risks associated with metal concentrations arise due to sediment properties. The literature review suggests that deformed larvae are unsuitable bioindicators, given the unknown causes of deformations and the potential influence of other environmental pollutants. Results indicate that the larvae may serve as general bioindicators for pollution, lacking specificity regarding the contaminant nature. This research emphasizes the importance of thoroughly assessing metal concentrations in Lake Vomb and questions the utility of deformed Chironomidae larvae as singular indicators of heavy metal pollution. Further research is needed to better understand the relationships between metal concentrations, sediment properties, and bioavailability. Ultimately, the study underscores the complexity of assessing the environmental impact of metals and highlights the need to refrain from hasty conclusions or recommendations based on limited information.