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Characteristics of phytoplankton community structure in typical reservoirs in Weihe River Basin of China.

ZHOU Xiao-yuan**, ZHANG Xing-lang, HAN Ya-hui, WANG Mei, GAO Hong-wei   

  1. (Yellow River Fisheries Institute, Chinese Academy of Fishery Sciences, Xi’an 710086, China)
  • Online:2013-10-10 Published:2013-10-10

Abstract:

In June 2011, an investigation was conducted on the community structure of phytoplankton in four typical reservoirs in the Weihe River Basin. By using the β diversity index, non-metric multidimensional scaling (NMDS), and cluster analysis, the phytoplankton community structure in the four reservoirs was classified, and the causes resulting in the differences in the community structure were analyzed. A total of 40 species and 8 genera of phytoplankton in the four reservoirs were identified. The cell density of the phytoplankton ranged from 12.00×104 to 132.48×104 cells·L-1, and the biomass ranged from 0.39 to 3.29 mg·L-1. In terms of species composition, the phytoplankton in the four reservoirs belonged to diatomchlorella. The standing biomass of the phytoplankton in Shitouhe reservoir was mainly consisted of Bacillariophyta and Euglenophyta, and that in Xiluoyu reservoir was mainly of Euglenophyta and Chlorophyta. The composition of the phytoplankton in Taoqupo reservoir was more disperse, but the cell density was mainly consisted of Chlorophyta, Euglenophyta and Chrysophyta, whereas the biomass was mainly of Euglenophyta, Chrysophyta, and Pyrrophyta. The cell density of the phytoplankton in Xijiao reservoir was mainly consisted of Bacillariophyta and Cyanophyta, and the biomass was mainly of Bacillariophyta and Euglenophyta. The cell density and biomass of the phytoplankton in the four reservoirs was decreased in the order of Xijiao reservoir, Taoqupo reservoir, Xiluoyu reservoir, and Shitouhe reservoir. According to the β diversity index, NMDS, and cluster analysis, the phytoplankton community in Shitouhe and Xiluoyu reservoirs could be classified as a common group, while that in Taoqupo and Xijiao reservoirs could be classified as two other independent groups. The variations of the phytoplankton community structure among the four reservoirs could be primarily attributed to the differences in trophic levels. In addition, illumination and temperature could partly account for these variations.
 

Key words: Platycladus orientalis, water source, Vitex negundo var. heterophylla, precipitation events., hydrogen and oxygen stable isotopes, IsoSource model