TY - JOUR

T1 - Community assembly processes underlying the temporal dynamics of glacial stream and lake bacterial communities

AU - Gu, Zhengquan

AU - Liu, Keshao

AU - Pedersen, Mikkel Winther

AU - Wang, Feng

AU - Chen, Yuying

AU - Zeng, Chen

AU - Liu, Yongqin

PY - 2021

Y1 - 2021

N2 - Community assembly processes are important in structuring aquatic microbial communities; however, the influence of these processes on the dynamics of bacterial communities in glacial streams and lakes remains largely unstudied. To investigate the assembly processes underlying the temporal variation of the bacterial community, we collected 50 water samples over five months in an ephemeral glacial stream and its downstream lake at the terminus of the Qiangyong glacier on the Tibetan Plateau. Using the V4 hypervariable region of the bacterial 16S rRNA gene combined with environmental measurements, such as water temperature, pH, total nitrogen (TN), dissolved organic carbon (DOC) and water conductivity, we found that temporal variation in the environmental factors promoted the shift in the proglacial stream and the lake bacterial communities. The quantification of ecological processes showed that the stream microbial communities were influenced by the ecological drift (40%) in June, then changed to homogeneous selection (40%) in July and variable selection (60%) in September, while the dynamic pattern of proglacial lake bacterioplankton was governed by homogeneous selection (≥ 50%) over the time. Overall, the dynamic of bacterial community in the proglacial stream and lake water is influenced by environmental factors, and the community composition assembly of the Qiangyong glacial stream and lake could be dynamic and primarily governed by deterministic processes.

AB - Community assembly processes are important in structuring aquatic microbial communities; however, the influence of these processes on the dynamics of bacterial communities in glacial streams and lakes remains largely unstudied. To investigate the assembly processes underlying the temporal variation of the bacterial community, we collected 50 water samples over five months in an ephemeral glacial stream and its downstream lake at the terminus of the Qiangyong glacier on the Tibetan Plateau. Using the V4 hypervariable region of the bacterial 16S rRNA gene combined with environmental measurements, such as water temperature, pH, total nitrogen (TN), dissolved organic carbon (DOC) and water conductivity, we found that temporal variation in the environmental factors promoted the shift in the proglacial stream and the lake bacterial communities. The quantification of ecological processes showed that the stream microbial communities were influenced by the ecological drift (40%) in June, then changed to homogeneous selection (40%) in July and variable selection (60%) in September, while the dynamic pattern of proglacial lake bacterioplankton was governed by homogeneous selection (≥ 50%) over the time. Overall, the dynamic of bacterial community in the proglacial stream and lake water is influenced by environmental factors, and the community composition assembly of the Qiangyong glacial stream and lake could be dynamic and primarily governed by deterministic processes.

KW - Community assembly

KW - Glaciers

KW - Microbial ecology

KW - Temporal variation

U2 - 10.1016/j.scitotenv.2020.143178

DO - 10.1016/j.scitotenv.2020.143178

M3 - Journal article

C2 - 33153747

AN - SCOPUS:85095586124

VL - 761

JO - Science of the Total Environment

JF - Science of the Total Environment

SN - 0048-9697

M1 - 143178

ER -