The different responses of planktonic bacteria and archaea to water temperature maintain the stability of their community diversity in dammed rivers  

作　　者：Na Liu Baoli Wang Meiling Yang Wanzhu Li Xinjie Shi Cong-Qiang Liu 

机构地区：[1]Institute of Surface-Earth System Science,School of Earth System Science,Tianjin University,Tianjin 300072,China [2]Tianjin Bohai Rim Coastal Earth Critical Zone National Observation and Research Station,Tianjin 300072,China

出　　处：《Ecological Processes》2023年第1期365-378,共14页生态过程（英文）

基　　金：supported by the National Natural Science Foundation of China(42293264);the Special Foundation for National Science and Technology Basic Research Program of China(2021FY101000).

摘　　要：Background Planktonic bacteria and archaea play a key role in river nutrient biogeochemical cycling;however,their respective community assembly and how to maintain their diversity are not well known in dammed rivers.Therefore,a seasonal survey of planktonic bacterial and archaeal community compositions and related environmental factors was conducted in 16 cascade reservoirs and corresponding river waters on the Wujiang River and the Pearl River in southwest China to understand the above mechanisms.Results Deterministic processes dominated bacterial and archaeal community assembly.The structural equation models showed that water temperature can directly or indirectly affect the microbial diversity.Interestingly,planktonic bacterial diversity increased with increasing water temperature,while archaea showed the opposite trend;the overall diversity of bacteria and archaea was no significant changes with changeable water temperature.Abundant microbes had a stronger distance–decay relationship than middle and rare ones,and the relationship was stronger in winter and spring than in summer and autumn.Conclusions Planktonic bacteria and archaea in dammed rivers had different biogeographic distributions,and water temperature was a key controlling factor.The different responses of planktonic bacterial and archaeal diversity to water temperature could be due to their different phylogenetic diversity.This ultimately maintained the stability of total microbial community diversity.This study reveals the different responses of planktonic bacteria and archaea to water temperature and perfects the theoretical framework for planktonic microbial biogeography in dammed rivers.

关 键 词：Planktonic bacteria and archaea Community assembly DIVERSITY Water temperature Cascade reservoirs 

分 类 号：Q938[生物学—微生物学]