Effects of microplastics on bivalves: Are experimental settings reflecting conditions in the field?
2021
Baroja, Estibaliz | Christoforou, Eleni | Lindström, Jan | Spatharis, Sofie
Bivalves are the focus of experimental research as they can filtrate a broad size range of microplastics (MPs) with negative consequences for their physiology. Studies use a range of MP shapes, materials, sizes and concentrations raising the question on whether these reflect environmental observations. We review experimental studies on the effects of MPs on marine bivalves and contrast the MP characteristics used with corresponding data from the environment. Mussels were the most common bivalve across experiments which reflect their high abundance and broad distribution in the field. Although fibres are the dominant shape of MPs in coastal systems, most studies focus on spherules and beads, and MP concentrations are often orders of magnitude higher than environmental levels. For higher relevance of experimental findings we recommend that maximum experimental concentrations of MPs are in the range of 100–1000 particles/L, that there is more focus on microfibers and that concentration is reported in particles/volume.
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