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Brain food? Trophic transfer and tissue retention of microplastics by the velvet swimming crab (Necora puber)
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Microplastic accumulation via trophic transfer: Can a predatory crab counter the adverse effects of microplastics by body defence?
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Trophic transfer and accumulation of microplastics were studied in a predatory crab to examine whether predation from lower trophic levels contributes to microplastic body burden. The study found that the crab accumulated microplastics through both filter feeding from water and consumption of contaminated prey, suggesting that higher trophic predators cannot fully avoid microplastic exposure through dietary selectivity.
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Tiny plastic fibers, smaller than a grain of rice, turned out to be more harmful to mud crabs than larger plastic fibers, causing more deaths, damage to their gills, and buildup in their bodies. Since these crabs are part of the food chain that ends up on our plates, this research suggests that smaller microplastic fibers in our oceans could pose a bigger risk to seafood safety than previously thought.
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Researchers fed mussels pre-loaded with fluorescent polystyrene microspheres to crabs and detected the particles in haemolymph, hepatopancreas, ovary, and gills — demonstrating for the first time that microplastics can transfer naturally across a trophic level and translocate into the circulatory system of a predator.
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