Environmental DNA metabarcoding revealing the distinct responses of phytoplankton and zooplankton to cascade dams along a river-way

作者：Yanjun Shen, Yufeng Zhang, Xinxin Zhou, Qinghua Li, Jiaming Zhang, Ruli Cheng, Qing Zuo · 发表于：Ecological Indicators · 年份：2024 · DOI：10.1016/j.ecolind.2024.112545 · 被引用次数：23 · 研究领域：Environmental DNA in Biodiversity Studies、Microbial Community Ecology and Physiology、Fish Ecology and Management Studies

• A downward trend in planktonic diversity was observed along the cascade dams. • Flow rate and temperature regulated the plankton communities along the cascade dams. • Species replacement controlled the variations in plankton communities. • Phytoplankton had stronger environmental adaptation and dispersal ability than zooplankton. Despite providing significant assistance to human society, cascade dams can also have negative impacts on river ecosystems. As the crucial components of river ecosystem, the responses of phytoplankton and zooplankton to cascade dams have rarely been studied simultaneously, and thus, lacking the understanding of the difference in succession between them. Here, we investigated the phytoplankton and zooplankton communities in a river-way with cascade dams using an environmental DNA metabarcoding technology. Along the reservoir areas separated by dams, we found an obvious downward trend in diversity of plankton communities with significant variations in their compositions. The relative abundances of Bacillariophyta and Chlorophyta continued to decrease while Intramacronucleata increased along the river-way. Results of association analyses recognized temperature and flow rate as potential factors resiling the impacts of cascade dams. Beta diversity decomposition indicated species replacement as the main mechanism for variations in plankton communities with higher contribution for phytoplankton. Additionally, we detected wider environmental adaptation (b...