Effects of waterway regulation structures on the planktonic community in the upper Yangtze River

作者：Yu Wan, Guiquan Huang, Hongbo Du, Shengfa Yang, Wei Yang, Wenjie Li · 发表于：Ecological Indicators · 年份：2023 · DOI：10.1016/j.ecolind.2023.111049 · 被引用次数：8 · 研究领域：Microbial Community Ecology and Physiology、Marine and coastal ecosystems、Environmental DNA in Biodiversity Studies

To investigate the effects of the waterway regulation structures on the hydraulic characteristics, water physicochemical factors, and the planktonic community in the upper Yangtze River, this study was conducted in August and September of 2022 on two ecological dikes in the Chongqing section of the upper Yangtze River: the longitudinal dike and the spur dike. High-throughput sequencing technology was used to explore the differences in planktonic community structures upstream and downstream of the waterway regulation structures during the dry season, as well as their main influencing factors. The results showed that the dissolved oxygen increased significantly, and the turbidity and flow rate decreased significantly in downstream of dikes. The spur dike exhibited more pronounced changes in water quality and hydrodynamic factors compared to the longitudinal dike. The diversity index of phytoplankton, zooplankton, and fungi in the downstream of dikes were higher than those in the upstream, and the bacterial diversity index was higher than those of eukaryotes at each sampling site. The impact of the spur dike on the planktonic biodiversity index was greater than that of the longitudinal dike, as it alters flow velocity, turbidity, and dissolved oxygen. The major phyla of phytoplankton, zooplankton, and bacteria, including Cryptophyta (70.37–80.57 %), Mollusca (7.56–37.50 %), and Proteobacteria (48.53–55.92 %), had a higher relative abundance in upstream of dike, and their relativ...