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• W4200336093 abstract "The toxicity of microplastic particles (MPs) on aquatic environments has been widely reported; however, their effects on protists are still contradictory. For example, it is unclear if cell size and cell wall have a role in shaping the response of flagellates to MPs. In this study, seven marine flagellated microalgae (six Dinoflagellates and one Raphidophyceae) were incubated with 10 mg L −1 MPs (polystyrene plastic micro-spheres, 1 μm diameter) to address the above question by measuring different response variables, i.e., growth, optimal photochemical efficiency ( F v / F m ), chlorophyll-a (Chl-a) content, superoxide dismutase (SOD) activity, and cell morphology. The effect of MPs on growth and F v / F m showed species-specificity effects. Maximum and minimum MPs-induced inhibitions were detected in Karenia mikimotoi (76.43%) and Akashiwo sanguinea (10.16%), respectively, while the rest of the species showed intermediate responses. The presence of MPs was associated with an average reduction of Chl-a content in most cases and with a higher superoxide dismutase activity in all cases. Seven species were classified into two groups by the variation of Chl-a under MPs treatment. One group ( Prorocentrum minimum and Karenia mikimotoi ) showed increased Chl-a, while the other ( P. donghaiense , P. micans , Alexandrium tamarense , Akashiwo sanguinea , Heterosigma akashiwo ) showed decreased Chl-a content. The MPs-induced growth inhibition was negatively correlated with cell size in the latter group. SEM images further indicated that MPs-induced malformation in the smaller cells (e.g., P. donghaiense and K. mikimotoi ) was more severe than the bigger cells (e.g., A. sanguinea and P. micans ), probably due to a relatively higher ratio of the cell surface to cell volume in the former. These results implicate that the effect of MPs on marine flagellated microalgae was related to the cell size among most species but not cell wall. Thus plastic pollution may have size-dependent effects on phytoplankton in future scenarios." @default.
• W4200336093 created "2021-12-31" @default.
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• W4200336093 date "2022-04-01" @default.
• W4200336093 modified "2023-10-01" @default.
• W4200336093 title "Microplastics impacts in seven flagellate microalgae: Role of size and cell wall" @default.
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• W4200336093 doi "https://doi.org/10.1016/j.envres.2021.112598" @default.
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• W4200336093 hasPublicationYear "2022" @default.
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