Phytoplankton Composition and Distribution in Typical Reservoirs of Guangdong Province
广东省典型水库浮游植物组成与分布特征

Nineteen reservoirs in Guangdong province were sampled in June and December in 2000, roughly corresponding to the flood and dry seasons. A total of 142 species of phytoplankton belonging to 89 genera in 7 phyla were observed.They were as follows: 84 chlorophyta, 25 Bacillariophyta, 19 Cyanophyta, 9 Euglenophyta, 2 Pyrrophyta and Chrysophyta and only 1 Cryptophyta was found. The dominant species in the reservoirs were either Cyanophyta or Bacillariophyta. The cell density and chlorophyll concentration in the reservoirs located upstream were lower than in the downstream reservoirs. The abundance of species found were greater in the flood season than in the dry season. In most of the reservoirs, phytoplankton were dominated numerically by Cyanophyta in the flood season, and by Bacillariophyta in the dry season. The change in water volume by regulation could influence the seasonal variation. The dominant species of Cyanophyta were found in the west coastal area and Zhujiang delta; while the dominant species of chlorophyta were fonnd in the eastern coastal area as well as Dongjiang and Hanjiang watershed.