骆马湖浮游动物群落构建机制的季节差异OA

The metacommunity model is an effective approach for characterizing the mechanisms in structuring zoo-plankton community,and a key method for analyzing the process of environmental filtering and spatial diffusion lim-iting of zooplankton community.To elucidate the processes underlying zooplankton community assembly and to explore seasonal variations in the driving mechanism,a survey across different seasons was conducted at 20 sampling sites in Luoma Lake.A total of 98 zooplankton species,belonging to 23 families and 54 genera,were recorded.The average zooplankton density was 99.5±14.2 ind·L-1,and the average biomass was 0.837±0.094 mg·L 1.Dominant species included Brachionus calycifllorus,Asplanchna priodonta,Microcyclops varicans,Mesocy-clops leuckarti,Ceriodaphnia quadrangular,and Bosmina longirostris.The structure and diversity of zooplankton communities showed significant seasonal variation(P＜0.01).Environmental filtering and dispersal limiting had dif-ferent effects on community structure of zooplankton across seasons.In spring,autumn,and winter,environmental filtering and spatial diffusion limiting jointly shaped the zooplankton community structure,driven primarily by dis-solved oxygen,phosphate,chemical oxygen demand and medium-scale spatial factors(PCNM2,PCNM3,PCNM5,PCNM7,and PCNM8).In summer,however,environmental filtering played a more dominant role,mainly associated with total nitrogen,nitrate,and medium-to-large scale spatial factors(PCNM3 and PCNM5).Overall,environmental filtering plays a leading role in zooplankton community assembly.