Microplastics were detected in all feces samples of five stranded or bycatched loggerhead turtles(Caretta caretta)and three green turtles(Chelonia mydas)in Chiba Prefecture and two harvested green turtles in Ogasawara Island. Average number of the microplastics per weight(g)of dry feces were 108.46(range: 0.63-1023.03). Less microplastics were detected from the individuals which ingested less or no artificial debris in the digestive tract. More microplastics were ingested in green turtles than loggerhead turtles. Microplastics were categorized into fragment, film, fiber, styrofoam and primary form plastics. Most microplastics found in all individuals were fragments and also many films were found in some green turtles. Plastic material detected from both two species were mostly nylon. Besides, polypropylene and polyethylene were frequently detected from green turtles. The results suggest loggerhead and green turtles likely ingest difference type of the microplastics.
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