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Scleractinian coral encrustation of marine plastic litter: Field observations of pyroplastics in a subtropical island in Okinawa, Southern Japan
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Researchers surveyed four beaches on Aka Island, a protected marine area in Okinawa, Japan, and found six pieces of "pyroplastic," melted plastic litter resembling rocks, made of polyethylene. One piece had a coral skeleton growing on it, showing how plastic debris can persist and become part of reef ecosystems over time.
Emerging plastic pollution forms such as plastiglomerates, pyroplastics, plasticrusts and plastitars are increasingly recognized as anthropogenic markers of the Anthropocene, yet their presence and properties remain underreported in subtropical marine environments. This study investigated the occurrence of these marine plastic litter variants on four beaches (Agu, Maehama, Hizushi and Nishibama) around Aka Island, a marine protected area located in the Kerama Islands of Okinawa in southern Japan. A total of six incidences of plastic litter variants, all pyroplastics, were confirmed from all surveyed beaches except one. Raman spectroscopy was used to assess polymer composition, and spectra indicated that all variants were consistent with polyethylene. One of the variants was colonised and encrusted by a scleractinian coral skeleton with a diameter of 15.12 mm. These findings highlight the persistence and transformation of marine plastic litter in critical marine ecosystems such as coral reefs. We recommend incorporation of these plastic variants into marine litter monitoring frameworks. This study provides baseline data on pyroplastic formation within subtropical coral reef island environments.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.