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Seasonal Variation in Microplastics and Zooplankton Traits: The Ecological Vulnerability of an Oceanic Island System
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Seasonal variation in microplastics and zooplankton abundances and characteristics: The ecological vulnerability of an oceanic island system
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Researchers found seasonal variation in microplastic and zooplankton abundances around an oceanic island, with higher microplastic-to-zooplankton ratios in warmer months, suggesting the ecological risk to marine life from plastic ingestion fluctuates with environmental conditions such as temperature and precipitation.
Microplastics in the pelagic environment around oceanic islands of the Western Tropical Atlantic Ocean
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Researchers confirmed for the first time that microplastic pollution is present in the surface waters around three ecologically important island groups in the tropical western Atlantic Ocean. The particles — including fragments, films, paint chips, and fibers — come from both land and ocean sources, threatening marine species in these sensitive ecosystems.
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A January 2022 survey of zooplankton in Lakshadweep coral reef lagoons found microplastics in all taxa, with non-crustacean groups ingesting more particles and copepods preferentially consuming smaller fragments; polyethylene and polypropylene dominated, and Pollution Load Index scores indicated moderate-to-high contamination. These findings are significant because zooplankton form the base of marine food webs, meaning microplastic ingestion at this level can propagate contamination and harm up through fish, seabirds, and marine mammals.
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Researchers studying fish in a tropical bay found that 1 in 5 fish had microplastics in their stomachs, and this happened across all species, sizes, and locations, including areas far from big cities. Even fish-eating predators (which many humans also eat) showed contamination, suggesting plastic pollution is now baked into the food web from top to bottom. Since some of these fish end up on dinner plates, this study is a reminder that microplastic exposure through seafood may be more widespread than we think, and more research is needed to understand what that means for our health.
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Surveys of a tropical tourism island in Hainan, China found microplastic abundance of 1,117 items/kg in terrestrial soils — dominated by polypropylene and polyethylene fragments from tourism infrastructure — and 275–755 items/kg in nearshore sediments where fishing and domestic sewage contributed fibrous PET particles. The study shows tourism-driven islands face elevated terrestrial microplastic loads with distinct sources and polymer compositions compared to adjacent marine sediments.
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