Ecological characteristics of phytoplankton in Sanggou Bay

Abstract:

Based on four surveys from August 2003 to May 2005 in Sanggou Bay，Shandong Province, the ecological characteristics of species composition, biomass，community structure of phytoplankton were studied. The results showed that there were 72 species belonging to 32 genera of phytoplankton in the surveyed areas. Among them, 60 species of 29 genera were Bacillariophyta,which accounted for 83.3% of all species, and 12 species of 3 genera were Pyrophyta, which accounted for 16.7% of all species. The mean values of the phytoplankton biomass were 5.0×10⁴～3 416.0×10⁴ cell/m³；the maximum appeared in August 2003 and the minimum appeared in May 2005.The analyzing results diversity index，abundance index，simplicity index and evenness index showed that the characteristics of community structure varied with different seasons.The species number,biodiversity of phytoplankton in autumn were obviously greater than that in spring.The comprehensive assessing result suggests that the quantity distribution of species in Sanggou Bay was not even,and the biodiversity of phytoplankton was in moderate grade.