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Nano and microplastic interactions with freshwater biota – Current knowledge, challenges and future solutions
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This review examines how nano- and microplastics affect freshwater organisms by combining evidence from both field observations and laboratory experiments. Researchers identified a key gap: the most common plastic shapes found in nature (fibers) are not the ones typically used in lab studies (spherical particles), making it hard to compare results. The study proposes standardized methods to improve future research and better understand real-world impacts on freshwater ecosystems.
Current understanding of nano- and microplastic movement, propagation and potential effects on biota in freshwater environments is developing rapidly. Still, there are significant disconnects in the integration of knowledge derived from laboratory and field studies. This review synthesises the current understanding of nano- and microplastic impacts on freshwater biota from field studies and combines it with the more mechanistic insights derived from laboratory studies. Several discrepancies between the field and laboratory studies, impacting progress in process understanding, were identified including that the most prevalent plastic morphologies found in the field (fibres) are not those used in most of the laboratory studies (particles). Solutions to overcome these disparities are proposed to aid comparability of future studies. For example, environmental sampling and separation of biota into its constituents is encouraged when conducting field studies to map microplastic uptake preferences. In laboratory studies, recommendations include performing toxicity studies to systematically test possible factors affecting toxicity of nano- and microplastics, including morphology, chemical makeup (e.g., additives) and effects of plastic size. Consideration should be given to environmentally relevant exposure factors in laboratory studies, such as realistic exposure medium and effects of plastic ageing. Furthermore, based on this comprehensive review recommendations of principal toxicity endpoints for each of the main trophic levels (microbes, primary producers, primary consumers and secondary consumers) that should be reported to make toxicity studies more comparable in the future are given.
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A critical review asked how relevant research using commercial spherical plastic beads (a common lab standard) is to the irregularly shaped microplastics found in real environments. The analysis finds significant mismatches between lab model particles and environmental microplastics, urging more ecologically realistic experimental designs.
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This review critically evaluates published research on microplastic effects on aquatic organisms and identifies significant gaps between laboratory experiments and real-world conditions. Researchers found that most studies use polystyrene spheres at concentrations far higher than those found in the environment, while the most common microplastics in nature are fragments and fibers of other polymer types. The study calls for more environmentally realistic experimental designs to better understand the actual ecological risks of microplastic pollution.
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This review summarizes existing freshwater research on microplastics and nanoplastics, finding that smaller particles, fibers, and certain polymers tend to cause stronger effects in lab studies, though results vary. It notes most lab effect levels are far higher than concentrations measured in real freshwater, and proposes a framework for predicting toxicity based on particle traits.
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This review highlights the methodological problems in current microplastic and nanoplastic toxicity research on freshwater organisms, including the use of unrealistic plastic types, poor test designs, and environmentally irrelevant doses. The authors propose a harmonized framework for testing that better reflects real-world conditions, including more realistic particle types and exposure levels. Better standardized research is essential for accurately assessing the true environmental and health risks of micro and nanoplastic pollution.
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