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Effects of coastal upwelling on picophytoplankton distribution off the coast of Zhanjiang in South China Sea

100%

Wu M.-L. , Wang Y.-S. , Wang D.-X. , Dong J.-D.

tom Vol. 43, No. 3

283--291

Coastal upwelling occurred along the west coast of Guangdong in the northern South China Sea during the summer of 2006. The effects of upwelling on the vertical and horizontal distributions of Prochlorococcus and Synechococcus were investigated. A distinct vertical temperature difference between the surface water and water at a depth of 30 m was observed in the coastal upwelling region. There was a clear spatial variability of temperature, and an increasingly obvious horizontal gradient was created from the coast to offshore waters. Picophytoplankton communities observed from the coast to offshore waters were significantly different. In the coastal upwelling waters, the picophytoplankton community was dominated by Synechococcus within the euphotic zone. Prochlorococcus dominated the picophytoplankton community in the euphotic zone in the non-upwelling region. This difference in the picophytoplankton community structure was due to different hydrodynamics. The results of canonical correspondence analysis demonstrate that temperature, salinity, and phosphate concentration may be important factors affecting the distribution of Prochlorococcus and Synechococcus.

Identification of coastal water quality, including heavy metals, in the South China Sea

75%

Wu M.-L. , Zhang Y.-Y. , Long L.-J. , Zhang S. , Wang Y.-S. , Ling J. , Dong J.-D.

Polish Journal of Environmental Studies

2012

tom 21

nr 5

Human activities and natural processes like mixing and/or upwelling driven by climate change have a strong influence on water quality in the coastal regions. Human activities are the dominant factor for water quality in the mouth of the Sanya River. This region exhibited the maximum influence of discharge from the Saya estimated by higher nutrient levels and chlorophyll a (Chl a). Natural processes are the dominant factor regarding water quality in outer bay. Both human activities and natural processes play important roles on water quality in Sanya Bay. Each hydrologie and ecological zone has a specific water quality response associated with the relative importance of both human activities and natural processes. Therefore, the information would be useful for regional agencies in developing a strategy to carry out scientific plans for resource use based on marine system functions.