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Comparisons of microplastic pollution between mudflats and sandy beaches in Hong Kong
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A comparison of microplastic pollution between mudflats and sandy beaches in Hong Kong found higher concentrations and greater diversity of polymer types in mudflat sediments, consistent with their lower-energy, depositional character. The findings suggest that low-energy coastal habitats like mudflats — which are also biodiversity-rich — may be more heavily impacted by microplastic contamination than sandy beaches.
Most of the previous studies of microplastic pollution on coastal habitats focused on high energy beaches although low energy areas such as mudflats are supposed to retain more microplastics, not to mention that mudflats are biologically more diverse. We quantified and characterized microplastics from 10 mudflats and 10 sandy beaches in Hong Kong spanning from the eastern to western waters. Sediment samples were collected at 1.0 m and 1.5 m above chart datum (CD) and at the strandline. Abundance of microplastics ranged between 0.58 and 2116 items kg sediment with that on mudflats being ten times more than on beaches. Polyethylene (46.9%) was the most abundant and followed by polypropylene (13.8%) and polyethylene terephthalate (13.5%). Expanded polystyrene was the most abundant in the strandline samples but not at 1.0 m and 1.5 m above CD. Although previous studies have concluded that the input from Pearl River is a major source of microplastics on Hong Kong shores, this study has demonstrated that the contribution of local pollution sources such as discharge from sewage treatment plants to microplastic pollution should not be neglected.
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Microplastics in invertebrates on soft shores in Hong Kong: Influence of habitat, taxa and feeding mode
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Researchers surveyed microplastic occurrence in 38 invertebrate species across 18 mudflats and sandy beaches in Hong Kong, finding that feeding mode and habitat type were stronger predictors of microplastic ingestion than taxonomic group, with suspension feeders in mudflat environments showing the highest contamination. The study provides a broad baseline for microplastic uptake across coastal invertebrate communities.
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Researchers surveyed microplastic contamination in the mudflats of the South Yellow Sea and found plastic particles in both the water and sediment at all sampling locations. Areas near estuaries and ports had higher levels of microplastics in the water, while purely coastal mudflats accumulated more in their sediments. Although overall pollution levels were rated as low, the types of plastic polymers present indicated the potential for significant ecological risk.
Occurrence and size distribution of microplastics in mudflat sediments of the Cowichan-Koksilah Estuary, Canada: A baseline for plastic particles contamination in an anthropogenic-influenced estuary
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Researchers established baseline microplastic contamination levels in mudflat sediments of the Cowichan-Koksilah Estuary in Canada, documenting particle size distributions and polymer types in this ecologically important habitat for shellfish, fish, and birds.
Microplastic contamination, comparative retention efficiency, and ecological hazard in saltmarsh, mangrove, sandy, and muddy habitats along the northern Bay of Bengal coast
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Researchers compared microplastic contamination across four types of coastal habitats along the Bay of Bengal, including saltmarshes, mangroves, mudflats, and sandflats. They found that saltmarshes and mangroves retained significantly more microplastics than open sandy or muddy areas, acting as natural sinks for plastic pollution. The study highlights that these ecologically important habitats bear a disproportionate burden of microplastic accumulation, which may affect the organisms that depend on them.
Microplastic Accumulation in Hong Kong’s Marine Sediment: Spatial Pattern and Potential Sources
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Researchers conducted a comprehensive survey of microplastics in marine sediments across Hong Kong's waters. They found microplastics at every sampling site, with fibers and fragments being the most common forms and polypropylene and polyethylene the dominant plastics. The spatial patterns suggest that coastal urbanization and water circulation are key factors driving where microplastics accumulate in sediments.
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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.