Spatial-temporal dynamics and influencing factors of archaeal communities in the sediments of Lancang River cascade reservoirs (LRCR), China

• Published in: PloS one Vol. 16; no. 6; p. e0253233
• Main Authors: Yuan, Bo, Wu, Wei, Guo, Mengjing, Zhou, Xiaode, Xie, Shuguang
• Format: Journal Article
• Language: English
• Published: San Francisco Public Library of Science 15.06.2021; Public Library of Science (PLoS)
• Subjects: Analysis; Anthropogenic factors; Arid regions; Arid zones; Biogeochemistry; Biology and Life Sciences; Climate change; Dams; Earth Sciences; Ecology and Environmental Sciences; Editing; Environmental changes; Environmental engineering; Environmental factors; Environmental impact; Environmental science; Fluid dynamics; Fluid flow; Fluvial sediments; Geospatial data; Hydraulics; Hydroelectric power; Laboratories; Metabolism; Methodology; Monsoon climates; Next-generation sequencing; Nitrogen metabolism; Pollution control; Properties; Regulated rivers; Reservoir management; Reservoirs; River ecology; Rivers; Security; Security management; Sediments; Sediments (Geology); Technology; Temporal distribution; China
• ISSN: 1932-6203; 1932-6203
• DOI: 10.1371/journal.pone.0253233

The spatial and temporal distribution of the archaeal community and its driving factors in the sediments of large-scale regulated rivers, especially in rivers with cascade hydropower development rivers, remain poorly understood. Quantitative PCR (qPCR) and Illumina MiSeq sequencing of the 16S rRNA archaeal gene were used to comprehensively investigate the spatiotemporal diversity and structure of archaeal community in the sediments of the Lancang River cascade reservoirs (LRCR). The archaeal abundance ranged from 5.11×10 4 to 1.03×10 6 16S rRNA gene copies per gram dry sediment and presented no temporal variation. The richness, diversity, and community structure of the archaeal community illustrated a drastic spatial change. Thaumarchaeota and Euryyarchaeota were the dominant archaeal phyla in the sediments of the cascade rivers, and Bathyarchaeota was also an advantage in the sediments. PICRUSt metabolic inference analysis revealed a growing number of genes associated with xenobiotic metabolism and carbon and nitrogen metabolism in downstream reservoirs, indicating that anthropogenic pollution discharges might act as the dominant selective force to alter the archaeal communities. Nitrate and C/N ratio were found to play important roles in the formation of the archaeal community composition. In addition, the sediment archaeal community structure was also closely related to the age of the cascade reservoir and hydraulic retention time (HRT). This finding indicates that the engineering factors of the reservoir might be the greatest contributor to the archaeal community structure in the LRCR.