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Articles by Kedong Yin
Total Records ( 2 ) for Kedong Yin
  Weihua Zhou , Kedong Yin , Aimin Long , Hui Huang , Liangmin Huang and Dedi Zhu
  The spatial and seasonal dynamics of total and size-fractionated phytoplankton biomass (chlorophyll- a) as well as physical and chemical factors in the Yangtze River Estuary and adjacent East China Sea coastal waters were investigated from April 2002 to February 2003. Average surface total and water column integrated chlorophyll a biomass showed a clear seasonal variation in response to the Yangtze River discharge, with the highest in summer (~4 mg m-3 and >60 mg m-2), intermediate in spring and autumn (~1 mg m-3 and 26–28 mg m-2), and the lowest in winter (0.5 mg m-3 and <20 mg m-2). Summer maximum chlorophyll a concentrations (>10 mg m-3) occurred at intermediate salinities (~20–30) region beyond the front zone between 112.5°E and 123°E with sufficient nutrients replenishment for phytoplankton growth. Generally, spatial distribution of size-fractionated phytoplankton showed that phytoplankton biomass was dominated by the large size fraction (>20 μm) in the turbid eutrophic estuarine and near-shore waters, while the small-sized phytoplankton (<5 μm) were dominant in the offshore stations. Phosphate was the main limiting nutrient of phytoplankton biomass in river diluted water and most near-shore stations, while dissolved inorganic nitrogen became the potential limiting nutrient in some offshore stations, except for summer when phosphate limited almost all in the whole investigation region. Controlling the inputs of phosphate loading from the Yangtze River is one of the most effective strategies for reducing the increasing eutrophication and occurrences of harmful algal blooms in Yangtze River Estuary and adjacent East China Sea coastal waters.
  Yongli Gao , Kedong Yin , Lei He and Paul J. Harrison
  Trash fish is common feed for caged fish in marine aquaculture. Most feed is not eaten and enters the water surrounding fish farms. The organic matter in trash fish is a nutrient source contributing to aquatic eutrophication impacts such as algal blooms and low oxygen. The objective of this study was to examine whether phytoplankton utilized organic matter of trash fish directly. Fifteen microalgae species were cultured in the medium made of open oceanic water with f/2 enrichment (Treatment A, f/2 medium), with only silicate added (Treatment B, for diatom species) and with fish tissue+silicate (Treatment C). Four species grew significantly faster on fish tissue than in f/2 medium, another 4 species had similar growth rates between the two treatments (A and C). Growth rates of Pyramimonas sp. on different amount of fish tissue appeared to increase initially with increasing added fish tissue weight, reached a maximum at an intermediate amount of fish tissue additions. Time course of batch culture of Chaetoceros curvisetus showed that the species was capable of utilizing organic nitrogen released from fish tissue and grew well. Dissolved organic nitrogen (DON) was lower in the batch culture with algae and fish tissue than that with fish tissue but without algae in the medium, which indicated a direct utilization of DON during algal growth. These results indicated that fish tissue could be a direct nutrient source to support phytoplankton growth and coastal management needs to pay attention to organic contamination from trash fish.
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