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Microplastics as Carriers of Co-Occurring Pollutants in Freshwater Ecosystems: Mechanisms, Environmental Fate, and Ecotoxicological Risks
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Microplastics in rivers and lakes don't just pollute water on their own, this review of existing research shows they can act like tiny magnets, picking up heavy metals, pesticides, and other chemicals and carrying them through the food chain. That means fish and other wildlife may be exposed to a more toxic combo than either the plastic or the chemicals alone, which raises concerns for anyone eating freshwater fish or relying on these ecosystems, though scientists say more research is needed to fully understand the long-term risks to human health.
Microplastics are increasingly recognized as prevalent contaminants in freshwater ecosystems, where they interact with a wide range of co-occurring pollutants, including heavy metals, pesticides, pharmaceuticals, and persistent organic pollutants. Evidence indicates that microplastics can act as vectors, enhancing pollutant mobility and facilitating trophic transfer, while also modulating toxicity through synergistic or antagonistic effects. Ecotoxicological studies reveal adverse impacts on aquatic organisms, ranging from physiological stress and impaired reproduction to altered community dynamics, with implications for ecosystem functioning and human health. Despite growing knowledge, significant gaps remain in understanding long-term environmental behavior, standardized methodologies, and risk assessment frameworks. This review synthesizes current findings on microplastic–pollutant interactions in freshwater systems, highlights emerging ecotoxicological risks, and identifies critical research needs to inform effective management and policy interventions.
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Interactions between Nanoplastics and Heavy Metals in Freshwater Ecosystems: A Systematic Review of Adsorption Mechanisms, Combined Toxicity, and Ecological Risk
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Tiny plastic particles (nanoplastics) can act like magnets for toxic heavy metals in rivers and lakes, potentially carrying them into fish and other wildlife more easily than either pollutant would manage alone. This review pulls together existing research to show that whether this combo becomes more or less dangerous depends on factors like water chemistry and plastic type, but it means we may be underestimating pollution risks by studying plastics and metals separately. Since these contaminants can move up the food chain, this matters for anyone eating freshwater fish or relying on freshwater sources, though more real-world research is needed to know the actual risk
Co-Exposure of Microplastics and Metal Ions
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Tiny plastic particles in water don't just pollute on their own — this review of existing research shows they can act like magnets for toxic metals, binding them and carrying them into the bodies of fish and other aquatic life, sometimes making the metals more harmful. Since these smaller plastic bits can slip inside cells and cause damage, and since fish and seafood are part of many diets, this combo pollution could be a bigger health concern than looking at plastics or metals separately. The researchers note that scientists still don't fully understand the long-term risks, especially from the smallest "nanoplastic" particles, so more study is needed before we know exactly
Microplastics as vectors of chemical contaminants and biological agents in freshwater ecosystems: Current knowledge status and future perspectives
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This review examines how microplastics in freshwater ecosystems act as carriers for chemical pollutants and harmful microorganisms. Researchers found that pollutant concentrations on microplastic surfaces can be up to six times higher than in surrounding water, amplifying exposure risks for aquatic life and potentially humans. The findings highlight that microplastics are not just a pollution problem themselves but also a vehicle that spreads other contaminants through the food web.
Assessing and Managing Microplastic Risks in Freshwater Fisheries: Exposure Pathways and Toxicological Evidence
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This review assessed microplastic exposure pathways and toxicological risks for freshwater fish in rivers, lakes, reservoirs, and aquaculture ponds, covering ingestion, trophic transfer, and chemical co-contaminant effects. The authors concluded that freshwater fish face substantial microplastic risk and outlined monitoring and risk management strategies for fisheries managers.
From plankton to fish: The multifaceted threat of microplastics in freshwater environments
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This review summarizes how microplastics harm freshwater organisms from tiny plankton to fish through oxidative stress, inflammation, DNA damage, gut microbiome disruption, and metabolic disorders. Microplastics often combine with other pollutants in water, making their toxic effects even worse. Since freshwater systems are a major pathway for microplastics entering oceans and our food supply, understanding these effects is critical for protecting both ecosystems and human health.
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