Evolution of Plankton Community Structure During the Pond Aquaculture of Chinese Softshell Turtle,Pelodiscus sinensis
To study the evolution of the plankton community structure during the pond aquaculture of Chinese softshell turtle(Pelodiscus sinensis),water samples were collected at three stages:pre-aquaculture,mid-aquaculture stage and late-aquaculture stage for physicochemical and phytoplankton detection and analysis.The results showed that the NH4+-N reached 2.38 mg/L in the late-aquaculture stage,which was significantly higher than that of pre-aquaculture,mid-aquaculture stage.62 species of phytoplankton in 5 phyla were detected,and the species composition was mainly Chlorophyta and Cyanophyta;4 types and 39 species of zooplankton were detected,which were mainly protozoa and Rotifers.The abundance and biomass of phytoplankton were mainly Chlorophyta,and that of zooplankton were mainly copepods.The average abundance of phytoplankton and zooplankton reached the highest at the mid-aquaculture stage,with values of 4762600 ind/L and 1634 ind/L,respectively,and the biomass of phytoplankton and zooplankton reached the highest at the late-aquaculture stage,with 18.09 mg/L and 10.106 mg/L,respectively.The mean values of phytoplankton diversity index(H)and evenness index(J)were 0.1779 and 0.0604,respectively,which were significantly lower than those of pre-aquaculture.In the middle and late stage of aquaculture,Closterium gracile breb was the dominant algae.There was no significant difference in zooplankton diversity index(H)before and after aquaculture of P.sinensis.The results showed that the community structure of phytoplankton changed greatly while zooplankton changed little during the aquaculture of P.sinensis.The aquaculture water showed the trend of first getting worse and then gradually getting better,and the water stability was poor in the mid-aquaculture stage,so it was necessary to transfer water actively.
Chinese Softshell turtleplanktoncommunity structureevolutiondiversity index
NETL
NSTL
万方数据
