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Synergistic Effects of Microplastic and Lead Trigger Physiological and Biochemical Impairment in a Mangrove Crab
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Synergistic effects of microplastic and lead trigger physiological and biochemical impairment in a mangrove crab
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Researchers exposed mangrove fiddler crabs to microplastics and lead, both alone and in combination, to assess their joint toxic effects. They found that co-exposure synergistically increased lead bioaccumulation, oxygen consumption, and lipid peroxidation while suppressing antioxidant enzyme activity. The study suggests that microplastics can amplify the physiological harm of heavy metal contamination in sensitive mangrove ecosystems.
Characterisation of Microplastics in an Isolated Mangrove Island Using Multiple Ecosystem Components Including Brachyuran Crabs
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A comprehensive survey of an isolated mangrove island found microplastics in water, sediment, fallen leaves, and the gastrointestinal tracts of three brachyuran crab species, with fiber morphotypes dominant across all compartments, indicating trophic transfer from leaf litter to crabs. Mangroves serve as microplastic sinks and transfer points in coastal food webs, meaning contamination here propagates to higher trophic levels including species consumed by humans.
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This review examined how microplastics interact with heavy metals in aquatic environments, showing that temperature, pH, salinity, polymer type, and particle size modulate adsorption, desorption, and combined toxicity, with MPs acting as mobile heavy metal carriers throughout aquatic food webs. Understanding the synergistic toxicity of MPs and heavy metals is essential because their combined effects on aquatic organisms—and on humans consuming contaminated seafood—likely exceed the hazard of either pollutant alone.
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