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Anthropogenic microparticles across intertidal, shallow and mesophotic reef sediments in the Southwestern Atlantic
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Scientists found tiny bits of plastic and other man-made materials (mostly fibers, likely from clothing and textiles) buried in ocean reef sediments, not just near the shore, but also in deeper reefs up to 100 feet down. The closer to rivers and cities, the more contamination they found, showing that our plastic waste is traveling further into marine ecosystems than previously realized, including reefs that support fish we eat and ocean food chains overall.
The distribution of anthropogenic microparticles (AMPs) in reef sediments across different depths and along gradients of estuarine and urban influence remains poorly documented. This study provides baseline information on AMPs in sediments from intertidal (0–2 m), shallow (17–19 m), and mesophotic (30 m) reefs in the Southwestern Atlantic. Concentrations ranged from 73.27 to 1246.45 particles kg −1 dry weight, with the highest values recorded in intertidal reefs located closest to estuarine inputs. A total of 384 particles were recorded, predominantly fibers, while transparent and blue particles were the most common colors. Raman spectroscopy was used to identify particles, including plastic polymers such as polypropylene and polyethylene terephthalate (PET), as well as non-plastic particles composed of microcrystalline cellulose. Color composition differed among reef sites, with similar patterns observed in intertidal reefs adjacent to urbanized estuaries and in offshore shallow and mesophotic reefs. These findings provide baseline information on the occurrence, characteristics, and spatial distribution of anthropogenic microparticles in reef sediments across a tropical shelf gradient, contributing to a better understanding of microplastic and textile-derived contamination in understudied reef environments.
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Researchers investigated microplastic contamination of coral reefs on remote South Atlantic islands, finding widespread microplastic presence in reef environments and raising concerns about the physiological and ecological harm to coral ecosystems far from human population centers.
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Researchers sampled surface and bottom waters along the Southeast Florida Reef Tract over six months, finding 1,204 microplastic items across seven polymer types, with significantly more plastic at the surface than the seafloor. Five additional chemical contaminants were detected on the plastics, confirming that microplastics act as vectors for hazardous substances near fragile coral reef ecosystems. The study calls for both improved plastic waste management and active clean-up to protect these reefs.
Polymer Composition Provides Insights into Source- and Transport-Related Microplastic Patterns in Caribbean Coral Reef Environments
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Scientists studying Caribbean coral reefs found tiny plastic particles (smaller than a grain of sand) in every reef they tested, mostly from common plastics like packaging, textiles, and food containers. Some reefs closer to human activity showed different plastic "fingerprints," including materials from paints and vinyl products, suggesting local pollution—but ocean currents also seem to spread plastics widely across the region, mixing signals together. This matters because these same plastics can enter the seafood we eat and the water we swim in, and understanding where they come from is a first step toward reducing our exposure.
Reef‐building corals act as long‐term sink for microplastic
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Coral reef structures were shown to act as long-term sinks for microplastics, with microplastics accumulating in reef framework interstices and sediments at higher concentrations than surrounding seawater, potentially contributing to the resolution of the missing plastic problem in ocean budgets.
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