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Concentration dependent toxicity of microplastics to marine microalgae
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Researchers exposed the marine microalga Chlorella sp. to polystyrene microplastics at concentrations of 10 and 50 mg/L, finding that even low concentrations inhibited growth and disrupted photosynthesis, while higher concentrations caused more pronounced oxidative stress.
The widespread distribution of microplastics (MPs) in the environment poses a potential threat to ecosystems. Microalgae are key primary producers in marine ecosystems, and the algae is more sensitive to changes in the ecological environment. Therefore, assessing the toxicity of MPs pollution to microalgae is critically important. In this study, polystyrene (PS) MPs (1 μm) was selected to carry out exposure experiments on Chlorella sp. with the treatment concentrations of 10 and 50 mg/L. At each time period of the PS MPs treatment group, the 50 mg/L exposure level inhibited the growth of Chlorella sp., which was higher than that of 10 mg/L. Experimental data demonstrated the toxicity of PS MPs on Chlorella sp. was concentration-dependent. The maximum growth inhibition rate of PS MPs on Chlorella sp. reached 14% (10 mg/L) and 34.3% (50 mg/L). This research is of great significance for assessing the ecotoxicity of MPs in aquatic ecosystems.
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Effects of different concentrations and particle sizes of microplastics on the full life history of freshwater Chlorella
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Researchers investigated how polystyrene microplastics of different concentrations and particle sizes affect the complete life cycle of freshwater Chlorella algae. The study found that microplastics can inhibit algal growth by up to 68%, while also altering chlorophyll content and photosynthetic activity, indicating that microplastic pollution may pose significant risks to the base of aquatic food webs.
Concentration dependent toxicity of microplastics to marine microalgae
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A dose-response study of microplastic effects on marine microalgae found concentration-dependent toxicity across multiple species, with higher MP concentrations reducing growth rates, photosynthesis efficiency, and chlorophyll content, confirming that microplastics pose risks to the base of marine food webs.
Toxicity Effects of Polystyrene Nanoplastics with Different Sizes on Freshwater Microalgae Chlorella vulgaris
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Researchers tested how two sizes of polystyrene nanoplastics (50 nm and 70 nm) affected the common freshwater microalgae Chlorella vulgaris. Both sizes reduced algae growth, chlorophyll content, and photosynthetic activity in a dose-dependent manner, with the smaller particles causing more damage. Since microalgae form the base of aquatic food chains, their sensitivity to nanoplastics could have cascading effects on entire freshwater ecosystems.
Impact of Nano-Polystyrene on Growth Rate and Physiological Metabolism of Microalgae Chlorella vulgaris
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Scientists found that tiny plastic particles (nano-plastics), the kind that come from breaking-down plastic waste, can harm microalgae — tiny organisms that form the base of the ocean's food chain and help produce oxygen. Depending on the amount of plastic and type of light exposure, these particles either stressed out the algae's growth or disrupted their internal defense systems, showing that plastic pollution can ripple through the food web that humans ultimately depend on for seafood and healthy oceans.
Microplastics and Heavy Metals Removal from Fresh Water and Wastewater Systems Using a Membrane
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Researchers tested how polystyrene microplastics affect the growth, photosynthesis, and oxidative stress responses of freshwater microalgae Chlorella vulgaris. Smaller particles caused greater inhibition of growth and chlorophyll synthesis than larger ones.
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