湖南采桑湖浮游动物功能群特征及影响因子OA

The experiment conducted a seasonal sampling survey in July and November 2023,and January and April 2024 to investigate the functional groups of zooplankton and their main driving factors in Caisang Lake.A total of 43 zooplankton species were identified,including 22 species of Rotifera,12 species of Copepo-da and 9 species of Cladocera.Zooplankton abundance followed the seasonal order of summer>autumn>win-ter>spring,with rotifers dominating in summer and autumn,and copepods prevailing in winter and spring.Zooplankton biomass was the highest in winter,followed by autumn,summer,and spring,with cladocerans being dominant in winter and copepods generally prevalent in other seasons.The seasonal turnover rates of dominant species were 44.44%from summer to autumn,66.66%from autumn to winter,and 70%from winter to spring.The zooplankton community structure was more complex in winter and relatively simple in spring.Six zooplankton functional groups were identified,among which the RF group was dominant in summer,autumn,and winter,with proportions of 56.00%,52.94%,and 36.84%,respectively.In spring,both RF and SCF groups were dominant,each comprising 35.71%of the community.Redundancy analysis revealed that water temperature,total phosphorus,dissolved oxygen,and pH significantly influenced the distribution of zooplankton functional groups in Caisang Lake.