Diferences in seasonal dynamics,ecological driving factors and assembly mechanisms of planktonic and periphytic algae in the highly urban Fenhe River  

作　　者：Kangxu Zhao Wei Wang Hanjie Huang Junping Lv Xudong Liu Fangru Nan Ying Shi Shulian Xie Jia Feng 

机构地区：[1]School of Life Science,Shanxi University,No.63,South Central East Street,Taiyuan 030006,Shanxi,China [2]Shanxi Vocational University of Engineering Science and Technology,Jinzhong 030600,China

出　　处：《Ecological Processes》2024年第4期125-140,共16页生态过程(英文)

基　　金：funded by the National Nature Science Foundation of China(Nos.32270220 and U22A20445 to Jia Feng);the Excellent Achievement Cultivation Project of Higher education in Shanxi(No.2020KJ029);the Nature Science Foundation of Shanxi Province(No.202203021211313).

摘　　要：Background Algae play important roles in urban river ecosystems and are the cornerstones of most water quality monitoring programs.Thus,a better understanding of algal community dynamics is needed to support sustainable management of water resources in urban rivers.Results In this study,we quantifed the seasonal variations in planktonic and periphytic algal community structure in the highly urban Fenhe River and identifed environmental factors afecting algal community structure and diversity.We monitored planktonic(drifting)and periphytic(attached)algal communities in the Taiyuan section of the Fenhe River over one year.The results indicated that Cyanophyta was the dominant phylum in both communities,followed by Bacillariophyta and Chlorophyta.Signifcant diferences were observed in the composition of the planktonic and periphytic algal communities.In particular,the periphytic algal community was more diverse than the planktonic community.Water temperature and pH were the main environmental factors afecting planktonic and periphytic algal community structure,respectively,while nutrients were the most signifcant factor afecting planktonic and periphytic algal diversity.Ecological modeling indicated that the variations in the algal communities of the Fenhe River are mainly driven by stochastic processes.A co-occurrence network developed for the communities displayed positive interactions between the planktonic and periphytic algae.Conclusions These fndings deepen our understanding of the seasonal interaction between planktonic and periphytic algae and the driving factors afecting community structure in the Fenhe River.They also provide a theoretical basis for the managing and protecting water resources in urban river ecosystems.

关 键 词：Periphytic algae Planktonic algae Seasonal dynamics Assembly mechanism Co-occurrence network 

分 类 号：Q94[生物学—植物学]