LAUSR

In order to understand the evolution of zooplankton communities in the Dongting Lake tourist area, Hunan, China, a one-year experiment was started in January 2018. Investigation of the water quality conditions and the evolution of zooplankton communities at 24 sampling points including the “three mouths” and “four waters” in the Dongting Lake area, including the incoming water section, the lake area and the exit section. The Wanshen AlgaeC type zooplankton and algae intelligent identification counter was used to obtain the relevant data of phytoplankton in the experimental water. By analyzing zooplankton diversity, water eutrophication results, zooplankton density, and the correlation between zooplankton abundance and environmental factors, conclusions are drawn. The results show that 4 phyla and 20 genera of zooplankton are detected. The density of zooplankton ranges from 5.0 to 3.4×103·L1. The dominant genera of “three-port river structure” was Difflugia. The dominant genera of "four-port river structure” is the Difflugia and Tintinnopsis. The dominant genera of lake region are the Difflugia and Polyarthra. The eutrophication degree of Dongting Lake is evaluated by comprehensive trophic state index and plankton Shannon diversity index. The results of CCA show that salinity and water temperature are the main environmental factors influencing the distribution of zooplankton community in Dongting Lake tourist area. Different zooplankton have different tolerance to temperature and salinity changes, and their species composition and quantity distribution will vary with temperature and salinity changes. Temperature directly affects the body temperature of biological organisms. The temperature of the body determines the strength of zooplankton's metabolic process and affects the growth, development and reproduction of zooplankton.