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Comparative accumulation and effects of microplastics and microplastic-associated PCB-153 in the white hard clam (Meretrix lyrata) and giant river prawn (Macrobrachium rosenbergii) following chronic exposure
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Researchers compared how microplastics and microplastic-bound PCB-153 accumulate in clams and prawns over a chronic exposure period. They found that both species accumulated microplastics and associated contaminants, but the patterns of accumulation and toxic effects differed between the two organisms. The study demonstrates that microplastics can act as carriers of harmful chemicals into seafood species, with the combined exposure causing more oxidative stress than either pollutant alone.
Global environmental abundance of microplastics (MPs) is increasing. MPs may sorb hydrophobic organic contaminants (HOCs), accumulate in and cause deleterious effects on exposed organisms. This study investigated and compared the accumulation and effects of MPs and MP-associated PCB in the two indigenous aquatic organisms in Viet Nam, the white hard clams, Meretrix lyrata, and the giant river prawns, Macrobrachium rosenbergii. The test organisms were exposed to either polyethylene microbeads (PEMBs), waterborne polychlorinated biphenyl 153 (PCB-153), or PEMB-associated PCB-153 (PEMB-PCB) over 28 days. Organismal MP accumulation, survival, and weight gain were examined at various sampling intervals. In general, MP accumulation was significantly greater in the clams than in the prawns. A significant quantity of MPs was observed in the digestive systems of the organisms after 0.5-day and during 28-day exposure. Although the effect of MPs and MP-associated PCB-153 on mean survival rate was not statistically significant, this effect was significant towards the end of the 28-day exposure. In addition, while MP-associated PCB-153 did not significantly affect the weight gain of the prawns, it significantly reduced weight gain in clams. Given the global increases of MPs and HOCs (and in southeast Asia specifically), and the importance of the hard clams and giant river prawns in the Indo-Pacific region, this present study provides valuable data to enhance our understanding of the effects of MPs and HOCs on these species.
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Researchers exposed clams to low-density polyethylene microplastics that had been pre-contaminated with persistent organic pollutants and measured ecotoxicological effects including oxidative stress and genotoxicity. The study found that microplastics carrying adsorbed chemical contaminants caused greater biological damage than clean microplastics alone, suggesting that the pollutant-carrier role of microplastics amplifies their environmental impact on bivalves.
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Researchers studied the combined effects of polyethylene microplastics and a toxic organic pollutant (benzo[a]anthracene) on Manila clams. The study found that when the pollutant was present alongside microplastics, the clams showed more severe stress responses than from either contaminant alone. Evidence indicates that microplastics can act as carriers for harmful chemicals, potentially amplifying their toxic effects on marine shellfish.
The physiological response of the clam Ruditapes philippinarum and scallop Chlamys farreri to varied concentrations of microplastics exposure
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Researchers exposed two types of shellfish (clams and scallops) to polyethylene and PET microplastics and found that both species accumulated the particles in their digestive glands and gills. The exposure caused oxidative stress, disrupted energy and fat metabolism, and damaged tissue, with PET generally being more toxic than polyethylene. Since these are commonly eaten shellfish, the findings raise concerns about microplastic contamination affecting the safety of seafood for human consumers.
Co-occurrence of microplastics and organic/inorganic contaminants in organisms living in aquatic ecosystems: A review
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This review examines studies that measured both microplastics and chemical pollutants (organic and inorganic) in aquatic organisms at the same time. A positive correlation was found between microplastic levels and certain pollutants in organisms, suggesting microplastics may help transport contaminants into living things. The findings raise concerns that seafood contaminated with microplastics could also carry higher levels of toxic chemicals into the human diet.
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Freshwater shrimp exposed to polyethylene microplastics combined with lead showed significantly worse toxic effects than when exposed to either pollutant alone, with microplastics increasing how much lead accumulated in the shrimp's tissues. This demonstrates that microplastics can act as carriers that amplify the toxicity of heavy metals in aquatic food chains, potentially increasing human exposure to dangerous metals through seafood.
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