Abstract
In recent years, the occurrence of microplastics in the aquatic environment has gathered increasing scientific interest. Several studies have shown that the ingestion of microplastics may negatively influence the physiology of marine organisms having different feeding strategies, particularly in those species which cannot discriminate between food sources. Recent studies highlighted the potential for such particles to accumulate in the food web, posing risks to human health via the consumption of seafood. Furthermore, early findings also indicated the role of microplastics as vectors of chemical pollutants either used as additives during synthesis of the plastics or adsorbed directly from seawater, i.e., PAHs, PCB, and surfactants. Despite the importance of microplastics in adsorption and transport of hydrophobic pollutants, little is known about their distribution and accumulation in marine food webs, or their direct and indirect harmful effects. The Adriatic Sea represents a semi-enclosed basin with a low water recirculation rate and high anthropogenic pressures associated with unsustainable fishing and inputs of contaminants. The body burden, accumulation rates, polymer composition, and recurring morphotypes of microplastics in native blue mussels (M. galloprovincialis) were examined. Organisms collected offshore were compared to those collected in coastal areas. Microplastics were recovered from the soft tissues of all analyzed mussels. Coastal organisms showed a load of 1.06–1.33 fragments g−1 (wet weight) and 0.62–0.63 fibers g−1 (wet weight) while offshore organisms showed an accumulation of 0.65–0.66 fragments g−1 (wet weight) and 0.24–0.35 fibers g−1 (wet weight). The size class distribution revealed a marked prevalence of smaller particles (20 μm to 40 μm range) and the most recurring polymer type in analyzed organisms was PE followed by PP, PET, and equal amounts of PS, PLY, and PVC. A significant site-, time-, and oceanographic-related distribution trend was observed. Based on the findings presented here, there is a clear need to implement a seafood safety monitoring program to better understand actual human health–related risks.
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The authors are grateful to Dr. Shaw Bamber (NORCE as) for English proofreading, Dr. Thomas Maes (CEFAS) for the valuable support and suggestions improving the quality of the manuscript and the anonymous reviewers for the comments and suggestions. The authors also thank the crew of the “Tecnopesca II” research vessel.
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Gomiero, A., Strafella, P., Øysæd, K.B. et al. First occurrence and composition assessment of microplastics in native mussels collected from coastal and offshore areas of the northern and central Adriatic Sea. Environ Sci Pollut Res 26, 24407–24416 (2019). https://doi.org/10.1007/s11356-019-05693-y
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DOI: https://doi.org/10.1007/s11356-019-05693-y