Plastic Fuses with Corals

Marine plastic pollution is pervasive. It has been detected across diverse marine habitats, from shorelines and coral reefs to the deepest oceanic trenches. Although exact figures are elusive, estimates suggest that millions of metric tons of plastic accumulate on the seafloor.

For more than fifty years, scientists have documented marine wildlife becoming entangled in or ingesting plastic debris, leading some to coin the term “Plastocene” for the epoch beginning in the 1950s. Recent research reveals a novel form of contamination: plastic adhering to and fusing with coral structures.

The phenomenon, termed “plasticoral” by the research team, emerged from a survey of beaches on the Ryukyu Islands in southern Japan. Observers noted small, vivid specks embedded within the white coral rubble. Samples from three beaches on Okinawa’s main island were examined, and spectroscopic analysis identified polymers consistent with everyday household plastics.

Micro‑CT scans revealed that the polymers had infiltrated the microscopic pores of coral skeleton fragments, melting into them to the extent that separation became impossible.

“Plasticoral” discovered at the site of a bonfire on Chushu Beach. It is highly likely that it was formed from discarded plastic waste and a bonfire on the beach.

Photograph: Ilechukwu et al., 2026

Although coral rubble is no longer a living organism once washed ashore, it frequently re‑enters the marine environment, providing a stable substrate for new coral settlement and offering irregular crevices that shelter small marine organisms from strong currents and predators.

The precise effects of plasticorals on conspecific corals remain uncertain. Prior investigations have shown that chemicals leaching from common plastics can impair coral reproduction, and other research indicates that plastic fragments can transport pathogens to corals.

Scientists have yet to fully understand the mechanisms behind plastic fusion with corals. While rising sea temperatures are insufficient to melt plastic directly, ultraviolet radiation may play a role; however, the researchers suspect that beach bonfires are the primary driver.

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