Bottle cap drifted from the Philippines to Japan, harboring 307 marine organisms
Researchers discovered a plastic bottle cap off Japan's western coast that contained a tiny ecosystem of 307 creatures originating near the Philippines.
A team led by Nagoya University examined a bottle cap collected off Kochi Prefecture in early 2023 and found it carried a micro-ecosystem of 307 marine organisms from the Philippines. The cap, measuring about 3.5 centimetres in diameter, had traveled northward on the Kuroshio Current for a minimum of 70 days, according to ocean-current simulations. Inside, a nine-centimetre ragworm constructed a complex nest of mucus and pebbles that hosted a diverse assemblage of foraminifera, barnacles, bryozoans and flatworms, several species absent from Japanese habitats.
Isotope ratios in the foraminifera shells indicated exposure to warmer waters around the Philippine archipelago. Researchers stress that such small litter can act as vectors for invasive species, underscoring the need for proper waste disposal to protect marine ecosystems.
Why it matters
The find shows tiny plastic debris can spread invasive marine species across oceans, threatening local ecosystems.
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