title: Reproduction capacity of Potamogeton crispus fragments and its role in water purification and algae inhibition in eutrophic lakes.
abstract: The role of fragments in restoring eutrophic lakes remains unclear despite the importance of re-establishing submerged macrophytes via fragments. This study established a manipulative experiment using different biomass fragments of Potamogeton crispus. This approach was adapted to study the reproductive capacity, nutrient removal efficiency, and algae inhibitory effect of fragments. Results showed that fragments could grow throughout a 49-day experiment by maintaining the stable photosynthesis efficiency of leaves and lengthening the stems. These floating fragments could regenerate by producing turions for the maintenance of their species. Moreover, the increasing removal efficiency of TP, TN, NH4+-N, and NO3--N in water with the increase of fragment biomass indicates that the fragments could effectively purify water quality. Floating fragments competed with algae for nutrients, occupied a favorable ecological niche, and reduced algae biomass. They altered the structure of algae community and shifted the dominated green algae to cyanobacteria, the green algae of phytoplankton, and benthic algae. Findings imply that the postponable regulation of fragments is necessary for the ecological restoration of eutrophic lakes.
authors.affiliation: School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China; School of Environment, Nanjing Normal University, 210097 Nanjing, China.
authors.forename: Yiwen
authors.initials: Y
authors.lastname: Zhou
authors.affiliation: School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China.
authors.forename: Xiaohong
authors.initials: X
authors.lastname: Zhou
authors.affiliation: School of Environment, Nanjing Normal University, 210097 Nanjing, China.
authors.forename: Ruiming
authors.initials: R
authors.lastname: Han
authors.affiliation: School of Environment, Nanjing Normal University, 210097 Nanjing, China. Electronic address: xxg05504118@163.com.
authors.forename: Xiaoguang
authors.initials: X
authors.lastname: Xu
authors.affiliation: School of Environment, Nanjing Normal University, 210097 Nanjing, China.
authors.forename: Guoxiang
authors.initials: G
authors.lastname: Wang
authors.affiliation: School of Environment, Nanjing Normal University, 210097 Nanjing, China.
authors.forename: Xiansheng
authors.initials: X
authors.lastname: Liu
authors.affiliation: School of Environment, Nanjing Normal University, 210097 Nanjing, China.
authors.forename: Fengzhi
authors.initials: F
authors.lastname: Bi
authors.affiliation: School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China.
authors.forename: Deyou
authors.initials: D
authors.lastname: Feng
mesh_terms: D002681:China; D000460:Chlorophyta; D000458:Cyanobacteria; D005068:Eutrophication; D060106:Lakes; D010758:Phosphorus; D010839:Phytoplankton; D031821:Potamogetonaceae / Q000502:physiology*; D018508:Water Purification; D060753:Water Quality
chemical_list: D010758:Phosphorus
keywords: Algae; Eutrophic lake; Fragment; Potamogeton crispus; Reproduction capacity; Water quality