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Polystyrene microplastics impaired the feeding and swimming behavior of mysid shrimp Neomysis japonica
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Mysid shrimp larvae exposed to polystyrene and carboxylated polystyrene microplastics showed impaired feeding, reduced swimming activity, and growth inhibition, with carboxylated PS showing greater toxicity due to higher bioaccumulation in the stomach. The study demonstrates that surface chemistry of microplastics significantly influences their behavioral and physiological effects on marine crustaceans.
Growing evidences revealed the deleterious impacts of microplastics (MPs) on marine organisms. However, the effects of MPs on the movement behavior of marine crustacean is poorly understood. Therefore, this study aims to evaluate the physiological and behavioral responses of mysid shrimp (Neomysis japonica) larvae to polystyrene (PS) and carboxylated polystyrene (PS-COOH). PS-COOH presented a greater physiological toxicity to shrimp larvae compared to PS, causing significant lethal and growth inhibition effect, owing to bioaccumulation of MPs inside stomach. Both two MPs decreased the feeding efficiency of larvae, showing weakened predation competence. Moreover, reduced hunting and/or explorative ability of shrimps caused by MPs was also identified, which was evidenced by an overall decrease in swimming activity, range and frequency after exposure. Our study firstly highlighted that micron-sized polystyrene particles had the negative effects on the movement behavior of mysid shrimp larvae, thus posing potential hazard to population dynamics and ecological function of marine crustacean.
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Short-term toxicity of polystryrene microplastics on mysid shrimps Neomysis japonica
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Polystyrene microplastics were found to reduce survival in mysid shrimps (Neomysis japonica) in short-term toxicity tests, with lethal effects occurring at concentrations above 1 mg/L. Mysid shrimps are sensitive test species used in marine toxicology, and their vulnerability to microplastics is concerning given their importance in marine food webs.
Effects of polystyrene microbeads in marine planktonic crustaceans
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Researchers exposed barnacle larvae and brine shrimp to polystyrene microbeads at various concentrations and measured effects on survival, swimming behavior, and enzyme activity. While the microplastics accumulated in both species without causing mortality, high concentrations significantly altered swimming speed and cholinesterase enzyme activity. The study suggests that sublethal effects of microplastics on behavior and neurological function may be more ecologically relevant than direct mortality in marine crustaceans.
Polystyrene Microparticles and the Functional Traits of Invertebrates: A Case Study on Freshwater Shrimp Neocardina heteropoda
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Researchers exposed freshwater shrimp to polystyrene microplastics and found measurable changes in behavioral and physiological functional traits, contributing evidence that microplastic pollution poses risks to freshwater invertebrate communities beyond the marine environments typically studied.
The impact of amine and carboxyl functionalised microplastics on the physiology of daphnids
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Researchers investigated how surface-functionalized microplastics (amine and carboxyl groups) affect daphnids, finding that functionalization altered ingestion rates, gut transit, and physiological responses including reproduction and swimming behavior, demonstrating that surface chemistry significantly influences microplastic toxicity.
Tissue accumulation of polystyrene microplastics causes oxidative stress, hepatopancreatic injury and metabolome alterations in Litopenaeus vannamei
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Researchers found that polystyrene microplastics accumulated in shrimp organs, especially the liver-like hepatopancreas, causing growth problems, abnormal swimming, and oxidative stress. Higher microplastic concentrations led to greater tissue damage and disrupted key metabolic pathways including sugar, fat, and amino acid processing. The study expands our understanding of how microplastics affect commercially important seafood species.
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