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Revealing Microplastic risks in stratified water columns of the East China Sea offshore
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This study mapped microplastic distribution across different depth layers in the East China Sea and assessed their potential toxicity to marine organisms. Significant differences in microplastic characteristics were found between water layers, with certain depths posing higher ecological risks. Since the East China Sea is an important fishing ground, understanding how microplastics distribute through the water column helps assess risks to seafood safety and human health.
Microplastics have been proven to impact a broad range of marine species significantly. This study investigated the vertical distribution characteristics of microplastics (MPs) to verify their potential toxicity, distribution patterns, and affecting probability on organisms offshore of the East China Sea (ECS), China. Significant variations in MP characteristics across stratified water layers were identified and corroborated through artificial neural network (ANN) analysis. By a combination of species sensitivity distribution (SSD), risk quotient (RQ) and joint probability curves (JPC) method, this study gave the regional risk thresholds and current risk distributions. Based on SSD, the derived predicted no-effect concentration for the ecosystem was 52.0 items/L (95 % confidence interval: 13.7-262.8 items/L), with the 5 % species hazardous concentration at 103.6 items/L. The RQ assessment results indicated varying ecological risk levels across different water layers, with the highest risks transitioning from north to south and from surface to bottom layers. Most sites exhibited a moderate risk level, with the highest risks identified in surface water near the Yangtze River Estuary, China. Conversely, the JPC analysis suggested a minimal ecological risk across the study area, emphasizing variable ecological risk contingent on species presence. This study underscores the importance of examining surface and intermediate water layers for marine habitats and organisms, highlighting the necessity of prioritizing investigations into the distribution of MPs across different water layers in the ECS, particularly focusing on buoyant polyester fibers present in the upper water column and the layers beneath the offshore surface.
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Vertical Stratification and Driving Factors of Microplastics in the South China Sea: Distributions, Mechanisms, and Ecological Risks
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Researchers collected water samples from 15 stations across the South China Sea to map the vertical distribution of microplastics through the water column. They found that depth, ocean currents, and biological activity strongly influenced microplastic stratification, with ecological risk higher in surface and subsurface layers.
Vertical Stratificationand Driving Factors of Microplasticsin the South China Sea: Distributions, Mechanisms, and EcologicalRisks
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This study of the South China Sea found that microplastic abundance decreases significantly with water depth, with lighter polymers concentrated near the surface and denser polymers found deeper. Temperature, salinity, and ocean stratification were identified as key drivers of this vertical distribution pattern.
Occurrence, characteristics and ecological risk assessment of microplastics in the surface water of the Central South China Sea
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Researchers surveyed microplastic pollution in the central South China Sea and found concentrations ranging from 386 to over 4,200 particles per cubic meter of surface water, with much higher levels near the coast. The study revealed that conventional abundance-based risk assessments underestimate the true ecological danger because they overlook the specific toxicity of different plastic polymers. Polystyrene and PVC, though found in lower quantities, posed the highest ecological risk scores due to their greater toxicity.
The necessity of whole-water-column monitoring: microplastic vertical and horizontal distribution and ecological risk on the Eastern Coast of the inner Gulf of Thailand
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Researchers sampled microplastics at surface, mid-depth, and near-bottom layers across 20 coastal stations in the Gulf of Thailand, finding significant vertical and horizontal heterogeneity that surface-only monitoring would miss, with depth and distance from shore jointly controlling microplastic fate and ecological risk.
Abundant small microplastics hidden in water columns of the Yellow Sea and East China Sea: Distribution, transportation and potential risk
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Researchers discovered abundant small microplastics (under 100 micrometers) hidden beneath the surface of the Yellow Sea and East China Sea, at concentrations far higher than previously reported surface counts. The study suggests that conventional surface sampling methods may significantly underestimate the true extent of marine microplastic pollution, particularly for smaller particles.
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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.