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Effects of salinity on naphthalene adsorption and toxicity of polyethylene microparticles on Artemia salina
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Researchers studied how polyethylene microplastics and the chemical pollutant naphthalene interact at different salinity levels and affect the survival and feeding of brine shrimp. They found that higher concentrations of both microplastics and naphthalene reduced shrimp survival rates, and that microplastics adsorbed more naphthalene at elevated salinity levels. The findings demonstrate that the co-occurrence of microplastics and chemical pollutants in aquatic environments can create compounding harmful effects on marine organisms.
Plastic pollution in aquatic ecosystems is increasing and plastic particles may adsorb and transport a diverse array of contaminants, thereby increasing their bioavailability to biota. This investigation aimed to evaluate the effects of varying polyethylene microplastics (PE MPs) and naphthalene (NAPH) concentrations on the survival and feeding rates of the model organism, Artemia salina, as well as NAPH adsorption to microplastics at different salinity levels (17, 75, 35.5 and 52.75 g L) under selected climate change scenarios. Survival (48 h) and feeding rates (6 h) of A. salina were also monitored, revealing that the presence of higher PE and NAPH concentrations lead to decreased survival rates while also increasing the number and size of microplastic particles in the saline solutions. Higher PE concentrations negatively affected A. salina feeding rates and NAPH concentrations were positively correlated with particle number and size, as well as with NAPH and PE adsorption rates in solution. Our findings demonstrate that the co-occurrence of microplastics and NAPH in aquatic environments can result in detrimental zooplankton survival and feeding rate effects. Furthermore, this interaction may contribute to the accumulation of these contaminants in the environment, highlighting the need to simultaneously monitor and mitigate the presence of microplastics and organic pollutants, like NAPH, in aquatic environments.
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Researchers exposed brine shrimp to a combination of dust particles, cosmetic microplastics, and paracetamol to study their combined toxicity. The findings indicate that multiple pollutants together caused greater harm than any single pollutant alone, reducing hatching rates, survival, and antioxidant defenses, which highlights how real-world mixtures of contaminants can amplify damage to aquatic life.
Effect of salinity on microplastic accumulation and osmoregulatory toxicity in the fiddler crab Minuca rapax
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Researchers studied how water salinity affects the accumulation and toxicity of polyethylene microplastics in fiddler crabs from mangrove environments. They found that microplastics accumulated most heavily in the gills, and that salinity levels influenced both how much plastic the crabs absorbed and how it affected their ability to regulate body fluids. The study reveals that environmental salt conditions play an important role in determining how harmful microplastics are to estuarine organisms.
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