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Disruption of energy metabolism in the Pacific oyster (Crassostrea gigas) by co-exposure to aged microplastics and pathogenic Vibrio spp.
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Scientists found that when oysters are exposed to both aging microplastics and harmful bacteria (Vibrio) commonly found in seawater, the plastic particles act like tiny rafts that carry extra bacteria into the oysters, causing more damage and stress than either problem alone. This double threat disrupted the oysters' energy use so much that they made fewer eggs and sperm, threatening their ability to reproduce and sustain populations. Since oysters and other shellfish are a major food source for people, this research is an early warning sign that combined pollution stressors could impact seafood supplies and the marine ecosystems we depend on.
Marine microplastic pollution has become a global ecological and environmental issue. Under ultraviolet radiation in natural environments, microplastics gradually age, resulting in an increased surface area and an enhanced capacity to adsorb pathogenic Vibrio spp. from the water. This poses a serious threat to the survival of marine bivalves. However, the mechanism by which this combined stress affects bivalve adaptability by disrupting metabolic homeostasis remains unclear. Using the Pacific oyster (Crassostrea gigas) as a model organism, this study exposed oysters to a mixture of different concentrations of polypropylene microplastics (PPMPs) and two Vibrio spp. (Vs, Vp) for 30 days. Through an integrated analysis of histopathology, mitochondrial dynamics, and energy storage indicators, this study elucidated the mechanisms of combined exposure to microplastics and pathogenic Vibrio spp. across subcellular, tissue, and individual levels. The results showed that combined exposure to microplastics and pathogenic Vibrio spp. caused severe damage to the gill and digestive gland tissues of oysters, obstructed their energy metabolism, and reduced their Clearance rate. In response to the toxic effects of combined exposure, oysters adjusted their energy allocation, which led to a reduction in gamete production, thereby potentially compromising population reproduction. This study provides new insights into the practical toxic effects arising from the combined pollution of microplastics and Vibrio spp.
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Researchers studied the combined effects of marine heatwaves and polyethylene microplastics on Pacific oysters, an important aquaculture species. They found that elevated temperatures and microplastic exposure together caused greater stress responses than either factor alone, affecting the oysters' immune function and energy reserves. The study highlights the growing ecological risk from multiple environmental stressors acting simultaneously on marine organisms.
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Researchers exposed oysters to microplastics and PCBs (industrial chemicals) both alone and together, finding that the combination caused significantly worse immune damage than either pollutant on its own. The pollutants reduced the oysters' ability to fight infection, increased cell damage, and triggered cell death pathways. This synergistic effect is concerning because microplastics in the ocean often carry other toxic chemicals, potentially making contaminated seafood a greater health risk.
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Researchers studied how exposure to harmful bacteria, including Vibrio and Microcystis species, affects the ability of Eastern oysters to accumulate and clear out microplastics. They found that bacterial co-exposure reduced the oysters' filtration rates, causing them to retain more microplastics for longer periods. The study suggests that climate-driven increases in harmful bacteria could worsen the microplastic burden in commercially important shellfish.
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