Irreversible community difference between bacterioplankton generalists and specialists in response to lake dredging

• Published in: Water research (Oxford) Vol. 243; p. 120344
• Main Authors: Yang, Yuyi, Zhang, Weihong, Liu, Wenzhi, He, Donglan, Wan, Wenjie
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 01.09.2023
• Subjects: Actinobacteria; bacterioplankton; Community diversity; ecological restoration; Environmental adaptation; eutrophication; Evolutionary potential; extinction; genetic distance; lakes; Landscape pattern; landscapes; phylogeny; Proteobacteria; Stochastic processes; Taxonomy vs. phylogeny; water; Community diversity; Landscape pattern; Environmental adaptation; Evolutionary potential; Stochastic processes; Taxonomy vs. phylogeny
• ISSN: 0043-1354; 1879-2448; 1879-2448
• DOI: 10.1016/j.watres.2023.120344

•Distinct difference in landscape pattern between generalists and specialists.•Stronger evolutionary potential was found for generalists rather than specialists.•Generalists showed stronger environmental adaptation than that of specialists.•Stochasticity-dominated community assembly decreased after dredging.•Irreversible community difference between generalists and specialists facing dredging. 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. [Display omitted]