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Articles by Xiaoping Huang
Total Records ( 3 ) for Xiaoping Huang
  Qiuying Han , Xiaoping Huang , Qianguo Xing and Ping Shi
  The coastal sea of South China provided an important habitat for protection and propagation of marine organisms. Rapid economic development and human activities, such as wastewater discharge, reclamation, overfishing and aquaculture in the South China Sea had already resulted in environmental degradation, and thus caused sharp contradictions between exploitation and protection of the coastal sea of South China. In this present article, the main environment problems and degradation trends were reviewed based on literatures and other sources of information, which mainly referenced nutrient pollution, persistent organic pollution and metal pollution, decrease of biodiversity, reduction of marine habitat and frequent natural and ecological disasters. The current efforts in China on protecting the environment in the coastal sea of South China were discussed, which included improving legislation by formulating a series of laws and regulations at national or local level, setting up natural reserves, and supporting research projects. There were many challenges regarding policy, management and science research to protect and sustain the coastal sea of South China, such as imperfect legal and administrative systems, lack of public participation, poor financial support and lack of monitoring and evaluation. Finally, some recommendations were put forward for the sake of the sustainable use of the environment in the coastal sea of South China, including reinforcing the planning of marine resource exploitation and use through integrated coastal zone management, strengthening the marine environment and protection awareness of the public, and scientifically establishing the fishery spawning spots and aquatic reserves.
  Yanyi Zeng , Xiaoping Huang , Feng Ye and Lei Tian
  The object of this study was to identify the accumulation patterns of Cu, Pb, Zn and Cd in different consumers living in the Pearl River Estuary. Concentrations of metals in water, sediments and tissues of demersal fish, crustaceans and molluscs were determined. Cluster analysis and principal component analysis were used to evaluate accumulation patterns of these four metals among species. Fish species were clustered as a group which was characterized by low accumulation of Cu, Zn and Cd. By contrast, crustaceans and molluscs were clustered to another group which was characterized by high accumulation of Cu, Zn and Cd. However, no significant difference of Pb accumulation between the two groups was identified. In addition, the concentrations of the four metals in fish were strongly correlated with metal concentrations in sediments, indicating that the sediment was the source of heavy metals in fish. Moreover, the accumulation of a heavy metal in fish was correlated with the same metal element and other heavy metals in the sediments. This may demonstrate a tendency of cross-acclimation in fish to different metals within the special habitat from the Pearl River Estuary. Dietary attention should be paid to the high concentrations of Pb in fish and crustaceans.
  Xia Zhang , Xiaoping Huang and Liangmin Huang
  In coastal cultural regions of Dapeng Cove (southwest of Daya Bay), the composition, abundance and community structure of phytoplankton, as well as physicochemical variables, were investigated to identify factors driving seasonal changes. During summer, local phytoplankton biomass was low, probably because of nutrient depletion. In September, sudden heavy rainfalls resulted in a substantial increase in nitrogen. As a result, a disturbance-tolerant diatom, Skeletonema costatum, increased rapidly. Organic matter associated with freshwater runoff, fishery activities and settled algal cells increased consumption of dissolved oxygen (DO), especially in fish farms. It was suggested that heavy rainfall events was probably a trigger of low oxygen level and exerted a major effect on nutrient cycling and the phytoplankton community. In winter, phytoplankton community was characterized by dinoflagellates, which are adapted to well-mixed conditions. Spring blooms composed of Pseudonitzschia delicatissima and P. pungens were triggered by warm temperature and increasing light intensity. Excessive ammonium levels in March probably contributed to bloom initiation. Dissolved inorganic nitrogen (DIN) and total phosphorus (TP) concentrations in fish farms were significantly higher than that in bivalve cultures and control sites although phytoplankton abundance in fish farms was not. We suggest that intense fish culture farming exerts more pressure on the ambient environment than shellfish farming.
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