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Tier 2
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Original research — experimental, observational, or case-control study. Direct primary evidence.
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Halocline-associated microplastic accumulation in a weakly mixed estuary: Insights from the Oyabe River, Japan
Marine Pollution Bulletin
2026
Summary
Researchers studied the Oyabe River estuary in Japan and found that the halocline in weakly mixed estuaries acts as a physical trap for microplastics, promoting prolonged particle retention and enhanced deposition into coastal and benthic sediments.
Study Type
Environmental
, values typical of the Oyabe River under normal flow. These findings identify weakly mixed estuaries as dynamic filters of MPs. In systems such as the Oyabe River, halocline-associated retention promotes prolonged accumulation and enhances MP deposition in coastal and benthic environments.