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A review on microplastic pollution in the mangrove wetlands and microbial strategies for its remediation
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Researchers reviewed the growing problem of microplastic pollution in mangrove wetland ecosystems and its effects on the biological communities that depend on these habitats. They found that microplastic exposure can substantially alter the microbial communities critical to nutrient cycling in mangrove environments. The review also explores microbial bioremediation strategies as a sustainable approach to addressing plastic pollution in these threatened coastal ecosystems.
Mangroves are one of the most productive ecosystems in the world harboring huge biological diversity. The prime ecological roles of mangroves are prevention of coastal erosion and shoreline protection. Mangroves face varying degrees of threats due to overexploitation, conversion of mangrove habitats for agriculture, settlement and industrial purposes, illegal encroachment, global warming, sea-level rise, El Nino, and pollution. Among them, microplastic (MP) pollution is a major concern threatening not only the mangroves per se but also the rich biodiversity that it shelters. In general, the microbial communities which are paramount to nutrient recycling and ecological dynamics undergo substantial changes upon MP exposure. If the MP pollution in the mangrove habitats continues unabated in the coming decades, there may be serious consequences on the already threatened mangrove ecosystems and the coastal communities. This review article attempts to consolidate MP pollution of mangrove wetlands, its impact on mangroves and associated microbiota, and the microbial solution for its remediation as a sustainable strategy.
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Microplastic weathering was slower in degraded mangrove sediments than in intact mangroves, with degradation also altering the composition and metabolic activity of microplastic-associated microbial communities. The findings suggest mangrove ecosystem health influences how rapidly microplastics degrade and what ecological roles microplastic-associated microbes play in these coastal environments.
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This review paper looks at how plastic waste builds up and breaks down into microplastics in mangrove forests—coastal ecosystems that trap trash from the ocean, land, and even air. This matters because mangroves are nurseries for fish and seafood we eat, so microplastics trapped there can work their way up the food chain and onto our plates. The researchers highlight using bacteria and other microbes as a promising, natural way to help break down this plastic pollution before it spreads further.
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Researchers exposed mangrove rhizosphere microbial communities to four types of microplastics in microcosm experiments and found that polyamide and PVC microplastics reduced microbial utilization of preferred carbon sources by up to 67%, while polyethylene exposure altered nitrogen-containing carbon metabolism. These disruptions to carbon and nitrogen cycling raise concerns about microplastics impairing the critical carbon sequestration function of mangrove ecosystems.
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This review synthesizes available research on microplastic pollution in mangrove ecosystems, which act as buffers between land and sea and accumulate plastics from both marine and terrestrial sources. The authors identify key gaps in knowledge and call for more research on how microplastics affect these ecologically critical habitats.
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