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Microplastics in Antarctic krill from the Antarctic Peninsula: distribution, composition, and exposure
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Scientists found tiny plastic particles called microplastics inside Antarctic krill, the small shrimp-like creatures that many ocean animals eat. The plastic pollution was widespread across different areas of Antarctica, with larger krill containing more plastic particles than smaller ones. This matters because krill are a key food source in ocean food chains, meaning these plastics could work their way up to fish and other seafood that humans eventually eat.
Despite growing concerns about microplastic (MP) contamination in Antarctic environments, polymer-resolved evaluations of MP exposure in Antarctic krill (Euphausia superba) remain limited, particularly with respect to spatial and size-specific variability. This study analyzed MP abundance, polymer composition, and exposure profiles in krill collected from two regions of the Antarctic Peninsula-the Bransfield Strait and the South Orkney Islands-by categorizing individuals into large (≥50 mm) and small groups (<50 mm) based on body length. MPs were detected in most samples, and MP abundance did not differ significantly between regions and remained within the range previously reported for the Southern Ocean. However, abundance was higher in the large group than in the small group. Polymer composition differed by both region and size class. Ethylene-vinyl acetate (EVA) was detected exclusively in smaller individuals, indicating size-dependent variation in ingested polymer types. Regional differences in polymer assemblages were reflected in distinct polymer hazard index (PHI) values despite modest variation in MP abundance, suggesting that derived hazard profiles were structured primarily by polymer composition rather than particle counts. This study characterizes polymer-specific MP exposure across regional and size gradients in Antarctic krill and clarifies compositional patterns that are not evident from abundance metrics alone, providing context for interpreting MP exposure within Antarctic food webs.
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Microplastics in Antarctic krill (Euphausia superba) from Antarctic region
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Researchers examined Antarctic krill from two regions of the Southern Ocean and found microplastics in these ecologically critical organisms. The most common particles were fibers, and the polymer types included polyethylene and polyester. Since Antarctic krill are a foundational species in the polar food web, their contamination with microplastics has implications for the broader Antarctic marine ecosystem.
Transcriptomic and In Silico Analysis of Microplastic–Protein Interactions in the Tropical Krill Euphausia distinguenda
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Scientists studied how tiny plastic particles affect proteins in small ocean creatures called krill, which are an important part of the marine food chain. They found that these microplastics stick to and change how certain proteins work in the krill's bodies, potentially disrupting their normal biological functions. This matters because krill are eaten by fish and other sea animals that humans consume, so understanding how plastic pollution affects marine life helps us better assess potential risks to our own health through seafood.
Enrichment characteristics of microplastics in Antarctic benthic and pelagic fish and krill near the Antarctic Peninsula
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Researchers examined microplastic contamination in 15 species of Antarctic fish and Antarctic krill collected near the Antarctic Peninsula. They found microplastics in all species studied, with fish accumulating significantly more particles than krill, and fibers being the most common type. The study demonstrates that microplastic pollution has reached even the most remote marine ecosystems on Earth.
Microplastics and other anthropogenic particles in Antarctica: Using penguins as biological samplers
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Researchers used penguin fecal samples collected from three species across the Antarctic Peninsula over seven breeding seasons to assess microplastic ingestion in these seabirds. Finding microplastics in Antarctic penguin feces confirms that plastic pollution has reached even remote polar food webs, with krill serving as a potential pathway for transferring microplastics to penguins.
Interactions between vertical migration and local oceanography drive microplastic exposure for Antarctic krill
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Scientists used computer models to track how tiny plastic bits and Antarctic krill (a shrimp-like creature that's a key food source in ocean food chains) move through the water near Antarctica, finding certain "hotspot" areas where krill are especially likely to encounter microplastics. Since krill are eaten by fish, penguins, whales, and other animals, and eventually make their way up the food chain, understanding where this plastic exposure happens most is an important step toward figuring out how microplastics might work their way toward the seafood many people eat.
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