Key Laboratory of Aquatic Botany and Watershed Ecology Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430070, China; Danjiangkou Wetland Ecosystem Field Scientific Observation and Research Station, Chinese Academy of Sciences & Hubei Province, Wuhan 430070, China.
College of Life Science, South-Central Minzu University, Wuhan 430070, China.
Water Res. 2023 Sep 1;243:120344. doi: 10.1016/j.watres.2023.120344. Epub 2023 Jul 13.
Understanding response of bacterioplankton community responsible for maintaining ecological functions of aquatic ecosystems to environmental disturbance is an important subject. However, it remains largely unclear how bacterioplankton generalists and specialists respond to dredging disturbance. Illumina MiSeq sequencing and statistical analyses were used to evaluate landscape patterns, evolutionary potentials, environmental adaptability, and community assembly processes of generalists and specialists in response to dredging in eutrophic Lake Nanhu. The Proteobacteria and Actinobacteria dominated bacterioplankton communities of generalists and specialists, and abundances of Proteobacteria decreased and Actinobacteria increased after dredging. The generalists displayed higher phylogenetic distance, richness difference, speciation rate, extinction rate, and diversification rate as well as stronger environmental adaptation than that of specialists. In contrast, the specialists rather than generalists showed higher community diversity, taxonomic distance, and species replacement as well as closer phylogenetic clustering. Stochastic processes dominated community assemblies of generalists and specialists, and stochasticity exhibited a larger effect on community assembly of generalists rather than specialists. Our results emphasized that lake dredging could change landscape patterns of bacterioplankton generalists and specialists, whereas the short-term dredging conducted within one year was unable to reverse community difference between generalists and specialists. Our findings extend our understanding of how bacterioplankton generalists and specialists responding to dredging disturbance, and these findings might in turn call on long-term dredging for better ecological restoration of eutrophic lakes.
了解负责维持水生生态系统生态功能的细菌浮游生物群落对环境干扰的反应是一个重要的课题。然而，对于细菌浮游生物的通才和专家如何响应疏浚干扰，仍有很大的不明确性。本研究使用 Illumina MiSeq 测序和统计分析，评估了在富营养化的南湖中，疏浚对通才和专家的景观格局、进化潜力、环境适应性和群落组装过程的影响。浮游细菌的优势菌门为变形菌门（Proteobacteria）和放线菌门（Actinobacteria），疏浚后通才和专家的浮游细菌中 Proteobacteria 的丰度降低，Actinobacteria 的丰度增加。与专家相比，通才表现出更高的系统发育距离、丰富度差异、物种形成率、灭绝率和多样化率，以及更强的环境适应性。相比之下，是专家而不是通才表现出更高的群落多样性、分类学距离和物种更替，以及更密切的系统发育聚类。通才和专家的群落组装主要由随机过程主导，随机性对通才的群落组装有更大的影响，而不是专家。本研究结果强调了疏浚可以改变细菌浮游生物通才和专家的景观格局，而在一年内进行的短期疏浚无法改变通才和专家之间的群落差异。本研究结果扩展了我们对细菌浮游生物通才和专家对疏浚干扰的反应的理解，这些结果可能反过来又呼吁长期疏浚，以更好地恢复富营养化湖泊的生态。
