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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.
Plastic debris especially microplastics (MPs) have become a global concern for the aggravating pollution in the oceans. In this study, the physico-chemical properties of fluorescently labeled polystyrene (PS) beads and the effects of PS-MPs on the survival of mysid shrimps (Neomysis japonica) were investigated. PS-MPs were identified to have spherical shape, uniform size and stable green fluorescence. The results showed that PS beads had little effects on the mortality of shrimps under a short-term (72 h) exposure with concentrations of 50 μg L-1 and 500 μg L-1. However, PS-MPs had severe short-term toxicity on the survival of mysid shrimps, resulting in 30% mortality especially in a 72 h exposure with the higher concentration of 1000 μg L-1. These findings provide new insights into the toxic effects of MPs on marine invertebrates.
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Short-Term Microplastics Exposure to the Common Mysid Shrimp, Americamysis bahia: Effects on Mortality and DNA Methylation
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Researchers exposed mysid shrimp to fluorescent polystyrene microbeads at various concentrations and durations to assess effects on survival and DNA methylation patterns. While no significant mortality was observed, the study found changes in DNA methylation, suggesting potential epigenetic effects from microplastic exposure. Evidence indicates that microplastics may alter gene expression in marine organisms even at sub-lethal levels.
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.
Polystyrene microplastics induce mortality through acute cell stress and inhibition of cholinergic activity in a brine shrimp
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Researchers exposed brine shrimp to polystyrene microplastics and found that even small particles trigger rapid cell stress and disrupt the nervous system by inhibiting cholinergic activity, suggesting microplastics can kill aquatic invertebrates through mechanisms that may also be relevant to other animals.
Effects of polystyrene microplastics on early stages of two marine invertebrates with different feeding strategies
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Researchers exposed early life stages of two marine invertebrates to polystyrene microplastics to measure effects on development and survival. The study found that even early life stages are vulnerable to microplastic exposure, raising concerns about impacts on marine invertebrate populations.
Ingestion and adherence of microplastics by estuarine mysid shrimp
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Researchers investigated how estuarine mysid shrimp ingest and accumulate microplastics both internally and on their external body surfaces. The study found microplastics in the shrimp's bodies and fecal pellets, and feeding experiments revealed that these organisms readily consume plastic particles, raising concerns about microplastic transfer through marine food webs.
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