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Polymer Composition Reveals Source- and Transport-Driven Microplastic Patterns in Caribbean Coral Reef Environments
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Researchers analyzed microplastic abundance and polymer composition across Cuban reef systems, finding that while polyethylene, polypropylene, and polyamide dominated all sites, heavily impacted reefs showed enrichment of PVC and PTFE from localized sources, and that regional Caribbean circulation — rather than local inputs alone — drives much of the distribution pattern.
Microplastic contamination in coral reef environments is increasingly recognized as a global concern; however, the extent to which polymer composition can resolve contamination sources and transport processes remains poorly understood. In this study, we assessed the abundance, composition, and diversity of microplastics (< 300 µm) across multiple reef systems in the Cuban archipelago using high-resolution spectroscopic analysis. Microplastic abundance varied substantially among sites, with a median concentration of 66 particles L⁻¹ (IQR: 45–115 particles L⁻¹), ranging from 8 to 218 particles L⁻¹. A total of 11 polymer types were identified, with polyethylene (PE), polypropylene (PP), and polyamide (PA) dominating the assemblages and accounting for approximately 77% of detected particles. While these polymers were consistently observed across all sites, indicating a pervasive regional background signal, highly impacted reefs exhibited more complex polymer profiles, including the enrichment of polyurethane (PU), polytetrafluoroethylene (PTFE), and polyvinyl chloride (PVC), reflecting localized anthropogenic inputs. Multivariate analysis revealed distinct compositional groupings associated with different contamination regimes. Notably, some sites exhibited elevated microplastic abundances while remaining dominated by common polymers, indicating a decoupling between contamination levels and source-specific signatures. This pattern suggests that regional transport and mixing processes, including circulation through the Caribbean basin and the Yucatán Channel, play a major role in shaping microplastic distributions in reef environments. These findings demonstrate that polymer composition provides critical information beyond abundance alone, enabling the differentiation between source-driven contamination and transport-driven accumulation. The integration of polymer-specific analysis with abundance and diversity metrics offers a robust framework for improving source apportionment and informing monitoring and management strategies in coral reef systems.
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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.
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Researchers compared microplastic concentrations, morphotypes, sizes, colors, and polymer compositions across six coral genera from three remote Mascarene Islands in the western Indian Ocean over a 1200 km transect. Microplastics were detected in all coral genera across all islands, with polymer types and concentrations reflecting both local and long-range ocean transport of plastic debris.
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Researchers took a holistic approach to characterizing plastic pollution across surface water, subsurface, sediment, and biota in the Southern Caribbean, finding that despite heavy tourism and fishing reliance, quantitative plastic data for the region had been largely absent.
Distribution of Plastic Debris in the Pacific and Caribbean Beaches of Panama
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Microplastics from both Pacific and Caribbean beaches in Panama showed similar contamination levels at tourist and protected sites, with polyethylene and polypropylene being dominant. The study illustrates that diverse coastal environments throughout the tropics are affected by microplastic pollution regardless of land use.
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Researchers assessed microplastic occurrence, abundance, and characteristics in coral, seawater, and sediment samples from two reef sites in the Gulf of Thailand, detecting microplastics in all coral samples at concentrations ranging from 0.24 to 2.60 particles per gram and finding spatial variability across reef species and sites.
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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.