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Microplastic accumulation and histological effects on the Atlantic deep-sea scale-worm Laetmonice filicornis
Summary
Researchers examined microplastic contamination in a deep-sea scale-worm species from the North Atlantic and found an average of about four particles per gram of tissue. Microscopic analysis revealed that plastic fibers were embedded in muscles, reproductive organs, kidneys, and blood vessels, which could impair vital functions. The findings are significant because this species serves as both predator and prey, meaning it can transfer accumulated microplastics up the deep-sea food chain.
Small benthic scavengers and carnivores, such as polychaetes, are very interesting to assess the accumulation and transfer of microplastics (MPs) to higher trophic levels in marine ecosystems. In this study we evaluate the presence, accumulation and impacts of MPs in the North-Atlantic deep-sea polychaete Laetmonice filicornis. Three types of MPs were identified: fishing lines, fibres and fragments, mostly black in colour, followed by red and blue ones. The average number of MPs was 4.10 ± 1.90 particles/g tissue. Fibres were the most abundant. They were composed of Polypropylene, Rayon, Polyethyleneimine Cellulose and Polyester. The histological analysis revealed the presence of microfibres embedded in muscles, peritoneum, nephridia, gonads and blood vessels, which can have a direct impact on vital functions, such as feeding and reproduction. This species occupies both predator and prey roles, bioaccumulate MPs and can transfer them to higher trophic links, representing a significant threat to all marine species, including humans.