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Concentration of microplastics in bivalves of the environment: a systematic review

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Abstract

The aim of this review was to identify the current knowledge regarding the concentration of microplastics in bivalves in the marine, estuarine, and freshwater environments. For this purpose, researches were conducted from September 2020 to February 2021 in the Scopus, Web of Science, and Google scholar databases, following a meticulous selection of articles. To comprehensively understand the selected articles, an extensive review was carried out in order to identify the methodologies employed, sampling sites, species evaluated, characteristics of the microplastics (concentrations, shapes, sizes, and polymers) and their relationship with the concentration of this particles in the environment. A total of 93 articles were selected, with an exponential growth in the number of articles from April 2014 to February 2021. Worldwide, 80 articles were realized in the Northern Hemisphere and thirteen in the Southern Hemisphere. The samplings of organisms were carried out in 36 countries, besides one in Antarctica. The concentration of microplastics were studied in 70 species, with mussels Mytilus spp. and the oysters Crassostrea spp. being the main genus studied. Due to the different methodologies used to digest the tissues of organisms and identify microplastics and species, it is difficult to make comparisons between the results of different studies. In addition, data on the concentrations of microplastics in the environment, as well as their composition and characteristics, are needed, enabling the verification of relationships with the concentrations identified in organisms, which does not occur in most studies. Thus, we suggest an increase in the number of studies to be realized in the southern hemisphere, future studies use the same methodology of digestion, the polymer identification of microplastics and samplings of the surrounding environment, enabling a greater comparison between studies.

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Funding

This work was funded by the Science and Technology Bureau of Espirito Santo State (Fundação de Amparo à Pesquisa do Espírito Santo—FAPES) and Coordination for the Improvement of Higher Educational Personnel (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—CAPES).

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FCB and FS had the idea for the article; FCB performed the literature search and data analysis; FCB and FS writing and revised the work.

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The authors declare that they have no competing interests.

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Bom, F.C., Sá, F. Concentration of microplastics in bivalves of the environment: a systematic review. Environ Monit Assess 193, 846 (2021). https://doi.org/10.1007/s10661-021-09639-1

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  • DOI: https://doi.org/10.1007/s10661-021-09639-1

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