College of Environmental Science and Engineering, Yangzhou University, Huayang West Road #196, Yangzhou 225009, China.
Key Laboratory of Integrated Regulation and Resources Development of Shallow Lakes of Ministry of Education, Hohai University, Xikang Road #1, Nanjing 210098, China.
Int J Environ Res Public Health. 2022 Oct 27;19(21):13948. doi: 10.3390/ijerph192113948.
Floods are frequent natural disasters and could have serious impacts on aquatic environments. Eukaryotic communities in artificial canals influenced by floods remain largely unexplored. This study investigated the spatiotemporal variabilities among eukaryotes in response to floods in the Grand Canal, China. Generally, 781,078 sequence reads were obtained from 18S rRNA gene sequencing, with 304,721 and 476,357 sequence reads detected before and after flooding, respectively. Sediment samples collected after the floods exhibited a higher degree of richness and biodiversity but lower evenness than those before the floods. The eukaryotic communities changed from Fungi-dominated before floods to Stramenopile-dominated after floods. The spatial turnover of various species was the main contributor to the longitudinal construction of eukaryotes both before the floods ( = 0.7054) and after the floods ( = 0.6858). Some eukaryotic groups responded strongly to floods and might pose unpredictable risks to human health and environmental health. For example, Pezizomycetes, Catenulida, Glomeromycetes, Ellipura, etc. disappeared after the floods. Conversely, , Synurale, Hibberdiales, , Diptera, and Rhinosporidium were all frequently detected after the floods, but not prior to the floods. Functional analyses revealed amino acid metabolism, carbohydrate metabolism, translation, and energy metabolism as the main metabolic pathways, predicting great potential for these processes in the Grand Canal.
洪水是常见的自然灾害，会对水生环境造成严重影响。受洪水影响的人工运河中的真核生物群落仍在很大程度上未被探索。本研究调查了中国大运河中真核生物对洪水的时空变化。一般来说，从 18S rRNA 基因测序中获得了 781,078 条序列读长，洪水前和洪水后分别检测到 304,721 和 476,357 条序列读长。洪水后采集的沉积物样本表现出更高的丰富度和生物多样性，但均匀度较低。真核生物群落从洪水前的真菌主导转变为洪水后的鞭毛藻主导。各种物种的空间转移是洪水前后真核生物纵向构建的主要贡献者（洪水前 = 0.7054，洪水后 = 0.6858）。一些真核生物群对洪水反应强烈，可能对人类健康和环境健康构成不可预测的风险。例如，洪水后 Pezizomycetes、Catenulida、Glomeromycetes、Ellipura 等消失了。相反，洪水后经常检测到、Synurale、Hibberdiales、、Diptera 和 Rhinosporidium，但洪水前没有。功能分析表明，氨基酸代谢、碳水化合物代谢、翻译和能量代谢是主要的代谢途径，这预示着这些过程在大运河中有很大的潜力。
