Research Progress in Area 2 方向 ( 二 ) 課題進展 127 Abstract The marine economy of Guangdong Province has achieved major development, but marine pollution has become an important factor threatening the survival and development of marine life in the Pearl River Estuary. Studying the sources of marine pollution and its eco-environmental effects in the Greater Bay Area and South China Sea, and reducing the content of marine pollutants not only have important ecological and environmental significances, but also have significant social and economic benefits. However, there is no effective solution to remediate the pollution in the cultured area. The project will use pollutants - marine organisms as a research system to study the sources, spatial and temporal differences and dynamic processes of environmental pollutants in the Greater Bay Area and South China Sea, and to reveal the main controlling factors of pollutants accumulation in marine environments. The project will provide important theoretical basis for the ecological risk assessment of pollutants in the Greater Bay Area and the South China Sea, the food safety of marine organisms and the sustainable development of aquaculture. Research Activities and Progress • Identified sources of metal pollution in oysters and other organisms using cutting edge technologies; • Revealed very contrasting patterns of bioaccumulation of contaminants in organisms; • Revealed thedifferential effectsof contaminants on marine organisms through applications of different techniques. Key Findings • Coagulation of colloidal metals and desorption of suspended particles controlled the geochemical behaviors of trace metals in the Pearl River Estuary; • Metal accumulation in the oysters fromdifferent sources (water vs. particles, freshwater vs. marine) varied between the eastern and western sides of PRE; • At the molecular levels, different metals produced different toxicities in field collected oysters. However, oysters may develop molecular mechanisms to alleviate the toxicity; • For the first time, we successfully visualized the subcellular localization and potential toxicity effects of AgNPs in the oyster gill filaments. Research Output Publication 18 Trained personnel 12 Marine Environmental Pollution and Ecosafety in the Greater Bay and South China Sea Prof. Wen-Xiong Wang City University of Hong Kong Fig 1.
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