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Factors Influencing the Clearance of Polystyrene Microplastics by Oysters: Roles of Environmental Conditions, Food Availability and Selection.
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Oysters filter tiny plastic particles from seawater, but how well they do this depends on water temperature, saltiness, and what food is available. This matters because oysters that don't clear microplastics efficiently may end up storing more of it in their bodies, the same oysters many people eat.
This study investigated the abiotic and biotic factors regulating the removal of polystyrene microplastics (PS-MPs) from the water column by the oyster Crassostrea hongkongensis. Our data revealed that MP sequestration is highly dependent on environmental conditions and food characteristics. Optimal clearance occurred at 25 °C and medium estuarine salinity (20 psu), while extreme thermal stress (30 °C) and hyposaline conditions (5 psu) significantly depressed filtration. Light condition had little effect on the removal of PS-MPs. Increased food density remarkably stimulated oyster's clearance of PS-MPs, though high concentrations shifted the removal mechanism toward pre-ingestive rejection via pseudofeces. Furthermore, selective feeding on preferred Isochrysis galbana, Chaetoceros gracilis and Phaeodactylum tricornutum yielded significantly higher removal efficiencies than Thalassiosira weissflogii, Dunaliella salina and Chlorella vulgaris. These findings improve our understanding of how abiotic and biotic factors regulate bivalve's removal and pelagic-benthic transport of microplastics in fluctuating coastal environments.
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Oyster Microplastic Concentrations
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Scientists fed oysters a mix of tiny plastic bits, plastic fibers, and tire dust at different water temperatures to see how much they'd absorb—and whether they could flush it out once moved to clean water. The findings matter because oysters are eaten whole, meaning any microplastics they soak up from warming, polluted waters could end up on your dinner plate, and warmer ocean temperatures (tied to climate change) may make this worse.
Ingestion and egestion of polystyrene microplastic fragments by the Pacific oyster, Crassostrea gigas
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Researchers investigated size-specific ingestion and egestion of polystyrene microplastic fragments by Pacific oysters, finding that oysters can ingest and later expel microplastics, with the process varying by particle size.
Microplastics exposure in European flat oyster, Ostrea edulis: Evaluation of accumulation and depuration under controlled conditions and molecular assessment of a set of reference genes
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Researchers evaluated microplastic accumulation and effects in European flat oysters under controlled exposure conditions, examining how filter feeding concentrates plastic particles and whether ingestion impairs oyster health. Exposure resulted in measurable microplastic accumulation in oyster tissue, with effects observed on feeding behavior and physiological condition.
Combined effects of salinity and polystyrene microplastics exposure on the Pacific oysters Crassostrea gigas: Oxidative stress and energy metabolism
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Researchers studied how salinity levels affect the toxicity of polystyrene microplastics in Pacific oysters and found that low salinity reduced microplastic uptake but created complex interactions with oxidative stress and energy metabolism. Smaller microplastics generally caused more biological disruption than larger ones across all salinity conditions. This is important because coastal oyster habitats frequently experience salinity changes, and the findings suggest environmental conditions can alter how harmful microplastics are to shellfish.
Accumulation and Depuration of Microplastics by Oysters Upon the Laboratory Conditions
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Researchers monitored microplastic accumulation and elimination in oysters over 30 days, finding that the digestive tract accumulated the highest concentrations (bioaccumulation factors increasing from ~10 to ~41 over 10 days), and that most particles were eliminated within 30 days of depuration.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.