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Where are we? Towards an understanding of the selective accumulation of microplastics in mussels
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This review synthesizes published research on how mussels selectively accumulate microplastics, examining what factors such as particle size, shape, polymer type, and environmental conditions influence which plastics end up in mussel tissue versus being rejected. The study aims to improve the use of mussels as bioindicator species for monitoring marine microplastic pollution by identifying key variables that affect accumulation patterns.
Mussels are suggested as bioindicators of marine microplastic pollution. However, they are selective in regards to accumulation of microplastics. To make studies more targeted and comparable, ultimately helping to determine the suitability of the mussel as a bioindicator species for microplastic exposure, we review the published literature that has directly or indirectly demonstrated particle selection in mussels. The reported difference between microplastic levels in mussel tissues and environmental matrices provides evidence for their selective uptake characteristics. Both the organ-specific fate characteristics of microplastics, and the different movement patterns of microplastics in the same organ, show that selective translocation processes take place. The selective elimination is reflected in multiple aspects which include (1) the different characteristics of microplastics in excretion and mussel body; (2) the different retention time of various microplastics in mussels; and (3) the tissue-specific change in the numbers of microplastics during the depuration process. This selectivity is affected by the characteristics of the microplastics, the environmental, or laboratory exposure concentrations, feeding status, and other factors. There are still many research gaps and contradictory viewpoints in this field due to this complexity. The current methodology needs improvement and a breakthrough in standardization.
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Researchers collected 213 blue mussels from three sites in the Oslo fjord to investigate whether mussel body size affects the number of microplastic particles found in their tissues. They found microplastics in mussels across size classes, with differences in particle counts between sites and size groups. The study contributes to understanding how mussel size and sampling location affect microplastic bioaccumulation in this commonly used sentinel species.
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