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Effects of Microplastics and Chromium in Marine and Freshwater Microalgae
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Scientists found that tiny plastic particles (microplastics) and chromium, a toxic metal from industrial pollution, can team up to harm algae, the tiny organisms that form the base of aquatic food chains and produce much of the oxygen we breathe. When both pollutants were present together, the damage to these algae was often worse than either pollutant alone, suggesting real-world waterways contaminated with multiple pollutants may be more harmful than lab studies testing just one substance at a time. This matters because damage to algae can ripple up the food chain, affecting fish and seafood that eventually end up on our plates.
The concurrent presence of microplastics (MPs) and heavy metals such as hexavalent chromium (Cr⁶⁺) in aquatic ecosystems poses a significant ecotoxicological threat. This study investigates the individual and combined effects of polyethylene microplastics (10 and 50 mg/L) and chromium (0.02, 0...
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This study found that polystyrene microplastics intensified the toxic effects of chromium, a heavy metal, on freshwater algae when both were present together. The combined exposure caused greater damage to algal growth, photosynthesis, and cellular defense systems than either pollutant alone. Since algae are the foundation of aquatic food chains, this synergistic toxicity could ripple through ecosystems and ultimately affect the safety of water and food sources for humans.
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When plastic pollution and heavy metals mix in water, scientists found their combined effect on algae (the base of the ocean food chain) actually depends on how much pollution is present: at very high, unrealistic levels the two pollutants seem to cancel out some of each other's harm, but at the lower, more realistic levels actually found in the environment, they can team up to cause even more damage to algae growth and health. Since algae support the entire aquatic food web that eventually reaches our dinner plates, this suggests real-world pollution combos may be riskier than lab studies using extreme doses have suggested.
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Researchers exposed marine medaka fish larvae to low concentrations of biodegradable polylactic acid microplastics and chromium, both individually and together, for 14 days. The combined exposure caused more severe intestinal damage, oxidative stress, and disruption of gut bacteria than either pollutant alone. The study suggests that even biodegradable microplastics can worsen the effects of heavy metal pollution on young fish in marine environments.
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A large analysis of 67 studies found that microplastics harm the tiny algae that form the base of freshwater food chains, stunting their growth, reducing their numbers, and impairing photosynthesis, with the smallest "nanoplastic" particles causing the most damage. Since these algae produce oxygen and support the entire aquatic food web (including fish we eat), widespread plastic pollution could ripple upward, potentially affecting water quality and food supplies that humans depend on.
Effects of microplastic combined with Cr(III) on apoptosis and energy pathway of coral endosymbiont
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Researchers found that polyethylene microplastics combined with chromium affected coral endosymbiont density, chlorophyll content, and key enzymes involved in apoptosis and energy metabolism, revealing compounded stress on reef-building corals.
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