Oysters contain more microplastics than two other shellfish species studied, because they filter more water and have more tissue, which means people eating them may ingest more microplastics.
Mechanism
Synthesis from 1 study
Oysters drink more water than other shellfish and have more body tissue, so they collect and hold more tiny plastic bits. When people eat them, they get more plastic than when eating clams or mussels, because there's simply more plastic in each bite.
Most probable mechanism
Oysters filter more water than other shellfish and have more body tissue, so they trap and hold more tiny plastic pieces from the water, which means people who eat them take in more plastic than when eating other shellfish.
Filter-feeding organisms draw in large volumes of surrounding water to extract food particles, increasing the volume of suspended microplastics ingested per unit time.
Microplastics that enter the digestive system are retained in soft tissues due to limited excretion capacity and physical entrapment within gill and mantle structures.
Larger body mass and greater tissue volume provide more space for microplastic accumulation, leading to higher total concentrations per individual compared to smaller species.
Higher tissue concentrations of microplastics result in greater intake per gram of consumed tissue, increasing the total daily exposure for human consumers.
Evidence from Studies
Supporting (1)
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Contradicting (0)
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