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Out of sight but not out of mind: Size fractionation of plastics bioaccumulated by field deployed oysters
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Field-deployed oysters accumulated plastic particles below 1 micrometer in size, a size fraction largely ignored in prior studies, suggesting that existing monitoring of microplastics in filter feeders substantially underestimates total plastic body burden.
Microplastics contamination has been widely reported in filter feeders yet the < 1 μm size fraction has been largely ignored. In attempt to characterize this sub 1 μm size fraction and better understand the size distribution of microplastics contamination in filter feeders, field deployed oysters were characterised using a combination of size fractionation combined with pyrolysis-gas chromatography-mass spectrometry (Py-GC/MS) as well as Fourier Transform-Infrared Spectroscopy (μFT-IR). Sequential filtration followed by Py-GC/MS identified the 1–22 μm fraction to contain the highest total plastic mass concentration (Ʃ31 mg/g), followed by the <1 μm fraction (Ʃ7.7 mg/g) and the >22 μm fraction (Ʃ0.1 mg/g). μFT-IR identified 0.2 particles/g tissue but was limited to particles >150 μm in size. Our results clearly show that an important size fraction of microplastics is being overlooked in almost all studies published to date that rely on FTIR for polymer identification.
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From Spat to Adult: Investigating Microplastic Accumulation in Crassostrea hongkongensis of Varying Sizes
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Researchers tracked microplastic accumulation in wild oysters of different sizes over three months in a Chinese mariculture bay. They found that while larger oysters accumulated more total microplastics, smaller oysters had significantly higher concentrations per gram of body tissue. The study also found evidence of oxidative stress linked to microplastic exposure, providing the first field-based evidence of a size-dependent pattern in how wild oysters accumulate plastic particles from spat to adult.
Spatiotemporal dynamics of microplastic accumulation and biodeposition mediated by the Pacific oyster (Crassostrea gigas) in coastal aquaculture
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Researchers tracked microplastics in farmed Pacific oysters and found that as the oysters grew bigger, the plastic particles inside them became more diluted relative to their body weight, even though total plastic amounts kept rising. The oysters also acted like tiny filters, pulling microplastics out of the water and depositing them into the seafloor sediment below the farm. For consumers, this suggests that oyster size and harvest timing could affect how much microplastic ends up on your plate, though more research is needed to understand the full health implications.
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.
Oyster as sentinels of recent microplastic contamination: Insights from a transplant experiment
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Researchers used oyster transplantation experiments to study how microplastics accumulate and are excreted in sentinel organisms under field-realistic conditions. The study found that bivalves can serve as effective biomonitors of recent microplastic contamination in coastal ecosystems. The findings help fill knowledge gaps about the dynamics of microplastic uptake and clearance in marine filter feeders.
Evidence of small microplastics (<100 μm) ingestion by Pacific oysters (Crassostrea gigas): A novel method of extraction, purification, and analysis using Micro-FTIR
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Researchers developed a novel extraction, purification, and micro-FTIR analysis method to detect small microplastics under 100 micrometers in Pacific oysters (Crassostrea gigas), confirming ingestion of these smaller particles and finding that existing methods routinely miss this size fraction due to inadequate tissue digestion protocols.
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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.