Zooplankton community structure in fish-culturing ponds with water circled by a integrated vertical-flow constructed wetland was studied from March to November in 2004. The species, density, biomass and diversity index of the zooplankton in the ponds were monitored. The effects of the different cultivated fishes and cycling treatments of water on the zooplanktons and diversity index were analyzed. Water quality was improved by the constructed wetland. The removal rate of zooplanktons was above 60%, but zooplankton community structure was almost not affected. Daphnia carinata was found dominant in pond 1 (with largest amount of cycled water) in the whole ponds, and the density in pond 1 was lower than that in other ponds, but the biomass was high. The species of zooplankton were similar in pond 3 (with circled water) and pond 4 (with non-circled water) when cultivated with the same fishes. The species number in pond 3 was larger than that in pond 4. The Simpson diversity index showed pond 1 > pond 2 > pond 3 > pond 4. It proved that water quality of cycling pond was better than that of non-cycling pond.
Wu Zhenbin (email@example.com) ; Liu Aifen; Wu Xiaohui; He Feng; Cheng Shuiping.Dynamics of zooplankton in fish-culturing ponds with water circled by integrated vertical-flow constructed wetland,Chinese Journal of Applied and Environmental Biology,2007,13(5):668-673