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Current and Historic Levels of Persistent (PAHs, PCBs) and Emerging Pollutant (Nano- microplastics or NMPs) Body-Burdens in Oysters and Fish from an Urban-Industrialized Subtropical Estuary (Galveston Bay, TX, USA)
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Scientists tested oysters and fish from Galveston Bay, a heavily industrialized waterway near Houston, for both old-school pollutants (like chemicals from oil and industrial waste) and newer contaminants like tiny plastic particles called nano- and microplastics. Since people eat seafood from bays like this one, understanding what's building up in these creatures over time helps us gauge whether our seafood, and the water it comes from, is getting cleaner or dirtier, and what that means for our own exposure to these pollutants.
Galveston Bay is a highly urban‑industrialized system that drains the Houston metropolitan area and serves as a major hub for maritime transport and energy production. In this study, we compared the current and historic levels of persistent (PAHs, PCBs) and emerging pollutants (Nano-microplast...
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A Comparison of Methods to Quantify Nano- and/or Microplastic (NMPs) Deposition in Wild-Caught Eastern Oysters (Crassostrea virginica) Growing in a Heavily Urbanized, Subtropical Estuary (Galveston Bay, USA)
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Researchers compared multiple analytical methods to quantify nano- and microplastic contamination in wild eastern oysters from Galveston Bay, Texas. The study found up to 200 microplastic particles in individual oysters, with polymer composition varying by location within the bay, and demonstrated that different detection methods can yield complementary information about contamination levels.
Microplastic contamination in tropical estuaries: Contrasting accumulation patterns in oysters driven by local features and condition index
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Scientists found tiny plastic particles (microplastics) in oysters from two estuaries in Brazil, even in areas with fewer people living nearby, meaning nearby development isn't the only factor causing contamination. Since oysters are commonly eaten and filter large amounts of water as they feed, this research matters because it shows that microplastic contamination in our seafood may be more widespread and harder to predict than previously thought, even in seemingly cleaner waters.
Microplastic in bivalves of an urbanized Brazilian estuary: Human modification, population density and vegetation influence
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Researchers measured microplastic contamination in oysters, clams, and mussels from a heavily urbanized estuary in Brazil, finding that industrial and port activities were stronger predictors of contamination than population density. Clams accumulated the most microplastics, and the study highlights how shellfish from polluted coastal areas can serve as indicators of the microplastic levels humans may be exposed to through seafood.
Occurrence of microplastics and heavy metals accumulation in native oysters Crassostrea Gasar in the Paranaguá estuarine system, Brazil
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Researchers examined native oysters from the Paranagua estuarine system in Brazil for both microplastic contamination and heavy metal accumulation. They found high levels of microplastics in all oyster samples, along with elevated concentrations of several heavy metals, and observed potential interactions between the two pollutant types. The study raises concerns about the combined exposure risks from microplastics and heavy metals in seafood harvested from polluted estuaries.
Abundance of microplastics in oysters Crassostrea gigas and water from a highly anthropized estuary.
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Researchers measured microplastic concentrations in surface water and whole tissue of Crassostrea gigas oysters at two sites in the Bahia Blanca estuary, a highly anthropized system in Argentina with major port, petrochemical, and urban wastewater inputs. MPs ranged from 6 to 50 items/L in water and 0 to 2 items/g wet weight in oyster tissue, with transparent and blue fibers predominating in both matrices.
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