Relationship between Community Structure of Zooplankton and Water Quality of a Mesotrophic Lake Wetland

摘要

cqvip:In order to explore the regular pattern of community succession of zooplankton and the influencing factors in the middle eutrophic reservoir,a systematic investigation was made to the zooplanktons in Baguishan Reservior from February to November in 2016,including the diversity,abundance,biomass of zooplanktons and environmental factors. The water eutrophication level was evaluated by using trophic state index( TLI),and Redundancy Analyses( RDA) was employed to build dynamic changes of structure of protozoa,rotifer and crustacean. Finally,a total of 40 samples were collected. A total of 96 species of zooplankton were identified,including 41 species of protozoa,34 species of rotifers,12 species of cladocerans,and 9 species of copepods. TLI varied from 42. 8 to 48. 9 with an annual average of( 45. 07 ± 2. 02),indicating that reservoir belonged to mesotrophic water body. Furthermore,Shannon-Wiener biodiversity( H') and Pielou evenness( J)showed that the water quality of the Reservoir was β-pollution pattern. The results of RDA showed that the zooplankton community structure changed significantly with months. Chlorophyll a( Chl. a),water temperature( WT) and ammonia nitrogen( NH_3-N) were the main factors influencing the community of protozoa,and Chl. a,WT,pH,NH_3-N and the ratio of NH_3-N to total phosphorus( TP) were important factors to rotifer community. The changes of crustacean community could be better explained by the factors of TP and WT,pH,and the ratio of NH_3-N to TP.