Microeukaryotic plankton community dynamics under ecological water replenishment:Insights from eDNA metabarcoding  

作　　者：Shuping Wang Songsong Gu Yaqun Zhang Ye Deng Wenhui Qiu Qianhang Sun Tianxu Zhang Pengyuan Wang Zhenguang Yan 

机构地区：[1]State Key Laboratory of Environmental Criteria and Risk Assessment,Chinese Research Academy of Environmental Sciences,Beijing,100012,China [2]CAS Key Laboratory of Environmental Biotechnology,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing,100085,China [3]Key Laboratory of Aquatic Genomics,Ministry of Agriculture and Rural Affairs,Beijing Key Laboratory of Fishery Biotechnology,Chinese Academy of Fishery Sciences,Beijing,100141,China [4]College of Resources and Environment,University of Chinese Academy of Sciences,Beijing,100190,China [5]Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control,School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China

出　　处：《Environmental Science and Ecotechnology》2024年第4期278-290,共13页环境科学与生态技术（英文）

基　　金：supported by the National Key Research and Development Program of China(2021YFC3201005,2021YFC3201000,and 2022YFC2601301);the Fundamental Research Funds for Central Public Welfare Scientific Research Institutes of China(2022YSKY-41);the National Nature Science Foundation of China(U1906223);The authors thank Yong Du in Yongding River Investment Co.Ltd for providing Fig.S2.Dr James Walter Voordeckers is acknowledged for assistance in English language modification.

摘　　要：Ecological water replenishment(EWR)is an important strategy for river restoration globally,but timely evaluation of its ecological effects at a large spatiotemporal scale to further adjust the EWR schemes is of great challenge.Here,we examine the impact of EWR on microeukaryotic plankton communities in three distinct river ecosystems through environmental DNA(eDNA)metabarcoding.The three ecosystems include a long-term cut-off river,a short-term connected river after EWR,and long-term connected rivers.We analyzed community stability by investigating species composition,stochastic and deterministic dynamics interplay,and ecological network robustness.We found that EWR markedly reduced the diversity and complexity of microeukaryotic plankton,altered their community dynamics,and lessened the variation within the community.Moreover,EWR disrupted the deterministic patterns of community organization,favoring dispersal constraints,and aligning with trends observed in naturally connected rivers.The shift from an isolated to a temporarily connected river appeared to transition community structuring mechanisms from deterministic to stochastic dominance,whereas,in permanently connected rivers,both forces concurrently influenced community assembly.The ecological network in temporarily connected rivers post-EWR demonstrated significantly greater stability and intricacy compared to other river systems.This shift markedly bolstered the resilience of the ecological network.The eDNA metabarcoding insights offer a novel understanding of ecosystem resilience under EWR interventions,which could be critical in assessing the effects of river restoration projects throughout their life cycle.

关 键 词：Ecological water replenishment Community stability SUCCESSION Community assembly mechanism Ecological network 

分 类 号：X17[环境科学与工程—环境科学]