Diel Patterns in the Composition and Activity of Planktonic Microbes in a Subtropical Bay  

作　　者：Songze Chen Muhammad Zain Ul Arifeen Minxu Li ShuaiShuai Xu Hao Wang Siruo Chen Jianchang Tao Kangli Guo Rongman Yan Yan Zheng Shengwei Hou Chuanlun Zhang 

机构地区：[1]Shenzhen Key Laboratory of Marine Archaea Geo-Omics,Department of Ocean Science and Engineering,Southern University of Science and Technology,Shenzhen 518000,China [2]Shenzhen Ecological and Environmental Monitoring Center of Guangdong Province,Shenzhen 518049,China [3]College of Life Science and Technology,Jinan University,Guangzhou 510632,China [4]Department of Mechanics and Aerospace Engineering,Southern University of Science and Technology,Shenzhen 518055,China [5]School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen 518000,China [6]Shanghai Key Laboratory of Polar Life and Environment Sciences,Shanghai Jiao Tong University,Shanghai 200030,China [7]Key Laboratory of Polar Ecosystem and Climate Change,Shanghai Jiao Tong University,Shanghai 200030,China [8]Shanghai Sheshan National Geophysical Observatory,Shanghai Earthquake Agency,Shanghai 200062,China

出　　处：《Ocean-Land-Atmosphere Research》2024年第1期298-308,共11页海洋-陆地-大气研究(英文)

基　　金：supported by the National Natural Science Foundation of China(grant nos.42141003,42276163,and 42321004);Shenzhen Science,Technology and Innovation Commission(SZSTI)Programme(grant nos.JCYJ20220530115401003,KCXFZ2021102017480305,and KCXFZ20211020174803005);Department of Science and Technology of Guangdong Province(grant no.2021B1515120080);Shenzhen Key Laboratory of Marine Archaea Geo-Omics,Southern University of Science and Technology(grant no.ZDSYS201802081843490);Project of Educational Commission of Guangdong Province of China(grant no.2020KTSCX123);Shanghai Sheshan National Geophysical Observatory(grant no.2020Z01);supported by Shanghai Frontiers Science Center of Polar Science(SCOPS,grant no.SOO2004-03).

摘　　要：Planktonic microbes play a crucial role in the matter transformation and energy transfer of marine ecosystems.Marine microbial communities are profoundly influenced by various environmental factors,and their variations are typically investigated in a time-dependent manner.However,studies conducted on a monthly or annual basis do not offer sufficient temporal resolution to reveal changes that can occur on an hourly basis.We conducted a high-resolution time-series study using amplicon sequencing on seawater samples taken at 2-h intervals over a 3-d period from the subtropical Daya Bay to investigate changes in the microbial community composition and activity.The results showed that 46.8%of the microbial rRNA sequences exhibited circadian rhythms,including phytoplankton(e.g.,Bacillariophyta,Cryptophyta,and Dinophyceae),heterotrophic bacteria(e.g.,Actinomarinaceae,Flavobacteriaceae,and SAR11_clade),and zooplankton(e.g.,Bestiolina and Phyllopharyngea).The genera of Bacillariophyta(e.g.,Chaetoceros and Pseudo-nitzschia)exhibited higher activity than those of Chlorophyta(e.g.,Micromonas).A similar trend was observed for zooplankton,where Choanozoa(e.g.,Copepoda)showed a strong circadian rhythm in abundance whereas Ciliophora(e.g.,Pithites)were more active.Light intensity and tides were identified as the driving factors behind the periodic succession and activity of the heterotrophic bacteria and phytoplankton with the exception of picocyanobacteria,which were mainly influenced by fluctuations in temperature,nutrients,and salinity.These high-resolution time-dependent observations showed that,despite the dynamic coastal environment,the periodic changes in the microbial community and activity were distinct and phylogenetically conserved.The findings may help in the development of ecosystem models for predicting microbial abundance and activity in rapidly changing coastal and estuary environments.

关 键 词：COASTAL ESTUARY TIDES 

分 类 号：P73[天文地球—海洋科学]