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The complexity of micro-and nanoplastic research in the genus Daphnia – A systematic review of study variability and meta-analysis of immobilization rates
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This meta-analysis pools data from multiple studies to assess how micro and nanoplastic particles affect Daphnia, tiny water creatures commonly used to test environmental toxicity. The findings help establish baseline toxicity levels for plastic particles in freshwater, which is important for setting safety standards that ultimately protect human drinking water sources.
Abstract In recent years, the number of publications on nano-and microplastic particles (NMPs) effects on freshwater organisms has increased rapidly. Freshwater crustaceans of the genus Daphnia are widely used in ecotoxicological research as model organisms for assessing the impact of NMPs. However, the diversity of experimental designs in these studies makes conclusions about the general impact of NMPs on Daphnia challenging. To approach this, we systematically reviewed the literature on NMP effects on Daphnia and summarized the diversity of test organisms, experimental conditions, NMP properties and measured endpoints to identify gaps in our knowledge of NMP effects on Daphnia. We use a meta-analysis on mortality and immobilization rates extracted from the compiled literature to illustrate how NMP properties and study parameters can impact outcomes in toxicity bioassays. In addition, we investigate the extent to which the available data can be used to predict the toxicity of untested NMPs based on the extracted parameters. Based on our results, we argue that focusing on a more diverse set of NMP properties combined with a more detailed characterization of the particles in future studies will help to fill current research gaps, improve predictive models and allow the identification of NMP properties linked to toxicity. Highlights Systematic review of NMP effects on the model system Daphnia Organismic, experimental and NMP properties influence observed effects In silico identification of traits likely linked to NMP toxicity (immobilization) More detailed standardized characterization of NMP needed to improve predictions
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