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Articles by Zhijun Dong
Total Records ( 2 ) for Zhijun Dong
  Guowei Zhou , Hui Huang , Ziniu Yu , Zhijun Dong and Yuanchao Li
  Free-living Symbiodinium have been the focus of considerable attention among coral reef researchers because they represent a source of symbionts for both recently recruited corals and adult corals that are subject to environmental stress (e.g. climate change). We evaluated the genetic diversity of free-living Symbiodinium in seawater collected from the Xisha Islands in the South China Sea using sequence analysis of the hypervariable region of the chloroplast 23S. We sequenced a total of 267 cloned gene fragments representing Symbiodinium in clades A, B, C, D, F, and G, of which 34 were distinct types. The diversity of free-living Symbiodinium types was high at all sites. The majority of Symbiodinium sequences belonged to clade C. There was no significant difference in Symbiodinium sequence types among sites or depths. Our results highlight the high diversity of free-living Symbiodinium pools in the coral reef environment and provide a foundation for future studies of the spatiotemporal distribution of Symbiodinium. Such information is critical to understand and predict the influence of symbiotic dinoflagellates on the adaptation of their host to environmental changes.
  Zhijun Dong , Dongyan Liu , Yujue Wang , Baoping Di , Xiukai Song and Yajun Shi
  In recent years, an increasing number of reports on blooms of Moon Jellyfish (Aurelia aurita) have occurred in the northern coast of China. Throughout the summer of 2009, we studied the occurrence of an A. aurita bloom in relation to environmental variables in the Yantai Sishili Bay of the Northern Yellow Sea. The mean abundance of A. aurita was 0.62 no m−3 in summer 2009 with a highest density of 2.28 n m−3, while the mean biomass of A. aurita was 163.7 mg C m−3. Highest biomass peaked at 673.6 mg C m−3. The present study showed that the spatial distribution of A. aurita seemed unrelated to the environmental variables: sea surface temperature, salinity, dissolved oxygen and nutrients. Chlorophyll a concentration was positively correlated to the occurrence of A. aurita in summer 2009, suggesting a cascading effect resulting from the jellyfish grazing on zooplankton that in turn reduced grazing of zooplankton on phytoplankton. Increased suitable settlement and reduced currents in the Bay by intense building of coastal construction and aquaculture rafts were discussed as possibly being the main drivers for the proliferation of Moon Jellyfish A. aurita. Further investigations on A. aurita polyps in situ should be conducted to address this hypothesis and relate these to current management policies.
 
 
 
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