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Microplastic pollution in riverine ecosystems: threats posed on macroinvertebrates

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Abstract

Microplastics (MPs) are pollutants of emerging concern that have been reported in terrestrial and aquatic ecosystems as well as in food items. The increasing production and use of plastic materials have led to a rise in MP pollution in aquatic ecosystems. This review aimed at providing an overview of the abundance and distribution of MPs in riverine ecosystems and the potential effects posed on macroinvertebrates. Microplastics in riverine ecosystems are reported in all regions, with less research in Africa, South America, and Oceania. The abundance and distribution of MPs in riverine ecosystems are mainly affected by population density, economic activities, seasons, and hydraulic regimes. Ingestion of MPs has also been reported in riverine macroinvertebrates and has been incorporated in caddisflies cases. Further, bivalves and chironomids have been reported as potential indicators of MPs in aquatic ecosystems due to their ability to ingest MPs relative to environmental concentration. Fiber and fragments are the most common types reported. Meanwhile, polyethylene, polypropylene, polystyrene, polyethylene terephthalate (polyester), polyamide, and polyvinyl chloride are the most common polymers. These MPs are from materials/polymers commonly used for packaging, shopping/carrier bags, fabrics/textiles, and construction. Ingestion of MPs by macroinvertebrates can physically harm and inhibit growth, reproduction, feeding, and moulting, thus threatening their survival. In addition, MP ingestion can trigger enzymatic changes and cause oxidative stress in the organisms. There is a need to regulate the production and use of plastic materials, as well as disposal of the wastes to reduce MP pollution in riverine ecosystems.

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Acknowledgements

Anonymous reviewers provided positive criticisms and suggestions which greatly improved the quality of the article.

Funding

This paper emanates from the African Water Resources Mobility Network (AWaRMN) Grant No. 2019–973/004–001, which has received funding from the Intra-African Academic Mobility Scheme of the European Union.

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Conceptualization: D.N., F.O.A., R.O. H.S.A., and G.N.; literature searches: D.N. and G.N.; writing—original draft preparation: D.N.; writing—review and editing: D.N., R.O., H.S.A., U.K.N., G.N., A.F.A. and F.O.A.

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Correspondence to Diana Nantege.

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The authors declare no competing interests.

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Responsible Editor: Philippe Garrigues

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Nantege, D., Odong, R., Auta, H.S. et al. Microplastic pollution in riverine ecosystems: threats posed on macroinvertebrates. Environ Sci Pollut Res 30, 76308–76350 (2023). https://doi.org/10.1007/s11356-023-27839-9

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  • DOI: https://doi.org/10.1007/s11356-023-27839-9

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