Space-time distribution characteristics of zooplankton and water quality assessment for Raohe river

Seventeen monitoring sections were set up in main stream of Raohe river to investigate and analyze the temporal and spatial distribution of zooplankton. Using Margalef diversity index and Shannon-Weaver biodiversity index evaluated the water quality.The results showed that there were 54 species of zooplankton in the main stream of Raohe river. The rotifers (31 species) were the predominate , which account for 62% ; the cladocerans, copepods and zooplankton protozoa species accounted for 14%, 14%, 10% respectively. The least was the zooplankton protozoa , which was only 5 species. Temporal distribution of zooplankton abundance on had season was greater than dry season, the density range was 54~405 ind/L. Combined with the zooplankton abundance and water quality index correlation analysis, results showed that the distribution of zooplankton closely and associated with water characteristics, and the water in Raohe river was to seriously polluted.