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Ecotoxicological effects of microplastics and adsorbed contaminants on aquatic organisms
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This review summarizes ecotoxicological studies on microplastics and their adsorbed contaminants in microalgae, crustaceans, mollusks, and fish. Across all tested organisms, microplastics caused growth inhibition, reduced reproduction, and physiological stress — particularly when carrying additional chemical contaminants.
Microplastic (< 5 mm) pollution have raised concern on behalf of the scientific community and the general public. Microplastic occurrence in aquatic environments and organisms have been well documented. However, it is in recent years that the ecotoxicological effects of microplastics have begun to be studied. The aim of the present study was to review, evaluate and discuss the current state of art regarding microplastic and related contaminants ecotoxicological effects in microalgae, crustaceans, molluscs and fish. The results of previous studies have proven growth inhibition and chlorophyll-a decrease in microalgae. Ingestion by small crustaceans and population reduction have been evidenced. Biomarkers in bivalves and fish have shown neurotoxic effects and oxidative stress, along with abnormal behavior. The current state of art lacks realistic parameters and microplastic concentrations to assess environmental pollution. The need for further research was discussed.
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