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Microplastic Pollution in Mangrove Sediments and Its Impact on the Nitrogen Cycle
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This review paper looks at how tiny plastic bits (microplastics) are building up in mangrove forests—coastal wetlands that act as nurseries for fish and natural buffers against storms—with pollution being especially bad in Asia. These plastics are messing with the bacteria that manage nitrogen, a nutrient mangroves need to grow and stay healthy, which could weaken these ecosystems' ability to filter pollutants and support marine life that eventually ends up on our plates.
The widespread application of plastic products has led to the issue of microplastic (MP) pollution in the environment. Due to the unique geographical location, mangrove wetlands receive pollution from both terrestrial and marine sources, resulting in severe MP pollution in their sediments. Sources of MPs in mangroves include direct transport from terrestrial and marine sources and the fragmentation of plastics trapped within mangroves through physical, chemical, and biological processes. In this chapter, we collected published studies on MP pollution in mangrove sediments and found that contamination is particularly severe in Asian mangrove sediments. Additionally, variations in MP distribution with sediment depth suggest that MPs serve as important markers of the Anthropocene. Furthermore, considering that the productivity of mangroves is limited by nitrogen (N), we reviewed the impacts of MPs on N cycling in mangrove sediments. The microenvironment created by MPs in sediments facilitates the removal of N through enhanced nitrification and denitrification. Meanwhile, microbes respond to increased N limitation by increasing dissimilatory nitrate reduction to ammonium and secreting N-acquiring extracellular enzymes.
More Papers Like This
Microplastics Intercepted in Mangrove Forests: Sources, Generation, and Mitigation Strategies
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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.
Microplastics strengthen nitrogen retention by intensifying nitrogen limitation in mangrove ecosystem sediments
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In a lab experiment simulating mangrove wetland sediments, microplastics altered nutrient cycling by intensifying nitrogen limitation, which changed how microbes processed nitrogen. While focused on environmental impacts, this matters because mangrove ecosystems are important coastal filters, and disrupting their nutrient cycles could affect downstream water quality and the health of seafood that humans consume.
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.
Accumulation of microplastics in mangrove ecosystem: source, properties, and impacts for conservation
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This review of studies from Asia, the Americas, and beyond found that mangrove forests—vital coastal ecosystems that trap carbon and protect shorelines—are accumulating tiny plastic particles from clothing fibers, fishing gear, and packaging waste. These microplastics are showing up in fish, crabs, and shellfish that people eat, raising concerns about how much plastic ends up on our dinner plates, while also potentially weakening the mangroves' ability to fight climate change. The findings suggest we need better tracking and stronger protections for these ecosystems, since plastic pollution may be harming both environmental health
Vegetation, salinity, and tides drive nitrogen cycling in Mangrove plastispheres
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Researchers studied how microplastics affect nitrogen-cycling microbial communities in mangrove ecosystems under varying salinity and tidal conditions. They found that microplastic surfaces hosted distinct microbial communities with significantly higher abundances of nitrogen-cycling genes compared to surrounding soils. The study suggests that microplastics may act as hotspots for nitrogen transformation in mangrove environments, potentially disrupting natural nutrient cycling.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.