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Polystyrene microplastics photo-aged under simulated sunlight influences gonadal development in the Pacific oyster
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Researchers found that polystyrene microplastics aged by simulated sunlight harmed the reproductive development of Pacific oysters, reducing gonad size and disrupting sex hormones. Female oysters were especially affected, with altered energy allocation and significant changes in genes related to reproductive development. Since most microplastics in the ocean have been weathered by sunlight, these findings suggest that real-world microplastic exposure may pose a greater threat to shellfish reproduction than laboratory tests with fresh plastics indicate.
Microplastics (MPs) aging in natural ecosystems are caused by solar irradiation. Photo-aged MPs in aquatic systems are a major threat to molluscs. In this study, polystyrene (PS) photo-aging was simulated using a sunlight simulator. After exposure of Crassostrea gigas to photo-aged PS, a decreased gonadosomatic index, coupled with histological alterations, suggested an inhibitory effect on the gonadal development of bivalves. As the concentration of aged PS increased, the inhibitory effects on gonadal development became more severe. The sex hormone (testosterone and estradiol) and energy metabolism (glycogen, lipid, and protein content) differences between C. gigas males and females suggested a disruption of sex hormonal homeostasis and a shift in energy allocation strategy, which may have affected reproduction, especially female oysters. In addition, the substantial downregulation of SOX-8, SOX-E, Piwi1, and TGF-β genes may be contributing factors causing the inhibitory effect of aged PS on the gonadal development of C. gigas. This study provides an essential reference for evaluating the reproductive health risks posed by aged MPs and offers novel insights and perspectives for exploring the impact of MPs under natural conditions.
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Oyster reproduction is affected by exposure to polystyrene microplastics
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Researchers exposed Pacific oysters to polystyrene microplastics during their reproductive period and found significant impacts on their ability to reproduce. Exposed oysters produced fewer and smaller egg cells and slower-swimming sperm, resulting in fewer offspring that also developed more slowly. The study demonstrates that microplastic pollution could threaten the reproductive success of commercially and ecologically important shellfish populations.
Aged polystyrene microplastics cause reproductive impairment via DNA-damage induced apoptosis in Caenorhabditis elegans
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Researchers found that sunlight-aged polystyrene microplastics caused significantly more reproductive damage than fresh microplastics in a laboratory worm model. The aged particles triggered DNA damage and programmed cell death in reproductive tissue through a specific signaling pathway. This matters because microplastics in the real environment are typically weathered by sunlight, making them potentially more harmful to fertility than laboratory studies using new plastics would suggest.
Polystyrene microplastics are reprotoxic for oyster
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This French study demonstrated that polystyrene microplastics are reprotoxic for oysters, impairing reproductive function in these economically and ecologically important bivalves. The finding highlights the risk that microplastic pollution poses to shellfish reproduction and by extension to marine food security.
Photoaging Elevated the Genotoxicity of Polystyrene Microplastics to Marine Mussel Mytilus trossulus (Gould, 1850)
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Researchers found that sunlight-aged polystyrene microplastics caused more DNA damage in marine mussels than fresh, unweathered microplastics. The UV-degraded particles disrupted cell metabolism and destabilized protective cell membranes more severely. This is important because most microplastics in the ocean have been weathered by sunlight, meaning real-world exposure may be more harmful than what many lab studies using pristine plastics suggest.
It's tough for life on a plastic planet
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A summary of research showing that Pacific oysters exposed to polystyrene microspheres suffered disrupted digestion and reduced reproductive success, with some negative effects passing to the next generation. The findings suggest microplastics can harm shellfish reproduction, with potential implications for both marine ecosystems and seafood industries.
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