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Microplastics in Sediments from the Southern Gulf of Mexico: Abundance, Distribution, Composition, and Adhered Pollutants
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Research Progress on Sources and EcologicalEffects of Microplastics in Sediments
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This review synthesizes research on the sources and ecological effects of microplastics in sediments, tracing transport pathways from terrestrial runoff through freshwater systems to marine sediment sinks and documenting impacts on benthic organisms and ecosystem function. Sediments serve as long-term reservoirs of microplastic pollution, making sediment ecology a critical lens for understanding cumulative environmental burden and food chain exposure risks posed by plastic debris.
Sedimentary records of microplastic pollution from coastal Louisiana and their environmental implications
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Sediment cores from two coastal Louisiana estuaries revealed microplastic fibers, fragments, and sheets accumulating in the sedimentary record, with concentrations highest near the surface and declining with depth. The presence of trace microplastics even in pre-1950 sediment layers — likely from bioturbation — highlights how these pollutants become embedded in coastal ecosystems, creating long-term exposure risks for benthic organisms.
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Researchers reviewed how microplastics accumulate in aquatic sediments — particularly the ocean floor — finding that sediments act as a long-term sink where plastics alter microbial communities and harm bottom-dwelling organisms, meaning the ecological damage of plastic pollution extends far beyond what is visible at the water surface.
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Researchers reviewed the rapid growth of microplastic pollution in the ocean, highlighting how these particles accumulate toxic chemicals and interact with microorganisms in ways that amplify their ecological harm. As plastic production continues to rise, the marine food web faces increasing exposure to contaminated microplastics that can ultimately reach humans through seafood.
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Researchers conducted the first survey of microplastic pollution in the inner Gulf of Thailand, finding an average of nearly 10 particles per liter in surface waters, dominated by polyethylene and polypropylene fibers and fragments. The moderate contamination levels detected suggest ongoing risk to marine ecosystems and the fisheries that coastal communities depend on for food.
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