Shellfish from Kenjeran and Balekambang contain small black plastic particles, mostly under 40 micrometers, made mostly of nylon and polystyrene, which likely come from urban plastic waste such as...
Mechanism
Synthesis from 1 study
City trash breaks down into tiny plastic bits that wash into the sea. Shellfish eat these bits by accident while filtering water, because the pieces look and act like their normal food. Once inside, the plastic doesn’t break down or get pushed out, so it stays in their bodies.
Most probable mechanism
Tiny pieces of plastic from city trash get washed into the ocean, where shellfish accidentally swallow them while filtering water for food. These plastics are small and dark, making them hard to tell apart from real food, so they stay in the shellfish’s body instead of being pushed out.
Urban plastic waste, including packaging, textiles, and single-use containers, degrades into small fragments under environmental stressors such as UV radiation and mechanical abrasion.
These fragments, predominantly black and under 40 micrometers in size, become suspended in coastal seawater and are ingested by filter-feeding shellfish during normal feeding behavior.
The physical properties of the fragments — small size, dark color, and polymer composition (nylon and polystyrene) — match the characteristics of plastics commonly found in urban runoff, increasing their likelihood of being mistaken for organic particulates.
Once ingested, the fragments are retained within the digestive tissues of shellfish due to their non-digestible nature and lack of efficient expulsion mechanisms.
Evidence from Studies
Supporting (1)
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