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Toxicological impacts of environmentally equivalent microplastics and cadmium co-exposure in tropical freshwater crab Sartoriana spinigera
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Scientists exposed freshwater crabs to microplastics and cadmium (a toxic metal) to see how these pollutants affect aquatic life, and found that the combination caused more harm than either one alone—damaging the crabs' liver-like organs, gills, and overall health. This matters because microplastics and heavy metals often mix together in real waterways, and this study shows their combined effects on animals we eventually eat may be worse than scientists previously realized when testing pollutants separately.
The toxic effects of microplastics (MPs) and trace metals on freshwater crustaceans remain poorly understood; therefore, current research examined the individual and combined effects of MPs, specifically polystyrene (PS) and polyethylene terephthalate (PET), and cadmium (Cd) on female freshwater crabs, Sartoriana spinigera, emphasizing behaviour, growth, haematobiochemical parameters, and tissue morphology. Crabs were exposed to five treatments (PS, PET, Cd, PS + Cd, PET + Cd) and a control for 14 days. The exposure caused notable behavioural and growth alterations, with the lowest survival rate (33.33% ± 6.67%) observed in the PS group. Bioaccumulation was highest in the gills for PS (44.67 ± 4.49 items/g) and in the hepatopancreas for PET (36.33 ± 2.41 items/g). Liver health markers showed increased alanine aminotransferase in the Cd group (9.33 ± 0.37 U/L), and elevated aspartate aminotransferase levels were noted in the PS group (25.83 ± 0.44 U/L). Additional stress markers, including total cholesterol, triglycerides, brix, glucose, and total protein, confirmed physiological disturbance in toxicant-exposed groups. Histomorphological analysis revealed structural changes in the hepatopancreas and gills, indicating impaired organ function. Overall, co-exposure caused greater physiological stress than individual treatment alone, demonstrating a combined toxic effect. These findings enhance our understanding of the complex interactions between MPs and toxic metals in tropical freshwater ecosystems, providing valuable insights for future research into multi-stressor impacts on crustacean physiology and toxicology.
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Researchers exposed crucian carp to microplastics and cadmium, both alone and together, and found the combination caused more severe liver damage and immune disruption than either pollutant alone. Co-exposure also significantly altered the fish's gut bacteria after 21 days. This is concerning because microplastics and heavy metals frequently co-occur in polluted waterways, potentially amplifying harm to aquatic life.
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Scientists fed shrimp a combination of microplastics and cadmium (a toxic heavy metal) and found that together, these pollutants stunted the shrimps' growth more than either one alone—and the shrimp also absorbed higher levels of both contaminants into their bodies, especially in organs like the liver-equivalent (hepatopancreas). This matters because shrimp are a popular seafood, and if microplastics help "smuggle" more heavy metals into the animals we eat, our exposure to these contaminants through diet could be higher than previously thought.
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Scientists exposed European seabass to microplastics and cadmium (a toxic metal) to see how these pollutants affect fish health, finding that the combination weakened the fish's immune system and antioxidant defenses more than either pollutant alone. This matters because it shows how plastic pollution can team up with other contaminants already in our oceans to harm marine life more severely, and since these fish are part of the seafood supply, understanding these combined effects helps us gauge risks to the food we eat.
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Researchers exposed adult zebrafish to polyethylene microplastics and cadmium, both individually and in combination, for 21 days. They found that microplastics and cadmium together produced additive toxic effects, increasing cadmium accumulation in fish tissues, altering behavior, and causing more severe organ damage. The study suggests that microplastics in contaminated waterways may worsen the harmful effects of heavy metals on aquatic life.
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When a Chinese freshwater fish species was exposed to both microplastics and cadmium together, the microplastics increased cadmium buildup in the liver and gills and worsened tissue damage compared to either pollutant alone. The combined exposure caused greater oxidative stress and disrupted immune and metabolic pathways. This is important because microplastics and heavy metals often coexist in polluted waterways, and their combined effect on fish could affect the safety of freshwater fish that people eat.
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