Changes in the ecosystem structure and function of a cyanobacteria bloom-dominated, shallow lake after ten-year eutrophication management

Min PAN; Jinyan DONG; Zhizhong ZHANG; Liyuan ZHANG; Yanying GUO; Jiaojiao YANG; Licheng HUANG; Chunbo WANG; Kun SHAN; Haijun WANG; Yongding LIU

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Changes in the ecosystem structure and function of a cyanobacteria bloom-dominated, shallow lake after ten-year eutrophication management

Special Section: Scientific control of cyanobacterial blooms and their secondary hazards | Updated：2024-12-24

- Changes in the ecosystem structure and function of a cyanobacteria bloom-dominated, shallow lake after ten-year eutrophication management
- Journal of Oceanology and Limnology Vol. 42, Issue 6, Pages: 1726-1740(2024)
- Affiliations：
  
  1.Dianchi Lake Ecosystem Observation and Research Station of Yunnan Province, Kunming Dianchi & Plateau Lakes Institute, Kunming650228, China
  2.Institute for Ecological Research and Pollution Control of Plateau Lakes, School of Ecology and Environmental Science; Yunnan Key Laboratory of Ecological Protection and Resource Utilization of River-lake Networks; Yunnan University, Kunming650500, China
  3.Kunming Fisheries Research Institute, Kunming650021, China
  4.Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing401122, China
  5.Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan430072, China
- Author bio：
  
  shankun@cigit.ac.cn
  wanghaijun@ynu.edu.cn
- Funds：
- DOI：
  CLC：
- Received：29 February 2024，
  
  Published：01 November 2024
- Accepted：
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PAN Min,DONG Jinyan,ZHANG Zhizhong,et al.Changes in the ecosystem structure and function of a cyanobacteria bloom-dominated, shallow lake after ten-year eutrophication management[J].Journal of Oceanology and Limnology,2024,42(06):1726-1740.
DOI：

PAN Min,DONG Jinyan,ZHANG Zhizhong,et al.Changes in the ecosystem structure and function of a cyanobacteria bloom-dominated, shallow lake after ten-year eutrophication management[J].Journal of Oceanology and Limnology,2024,42(06):1726-1740. DOI：

摘要

Abstract

Large and shallow lakes are widely influenced by multiple anthropogenic stressors

including eutrophication. Normally

diverse strategies of eutrophication management are needed to restore the lake ecosystems. Dianchi Lake

a subtropical plateau lake in Yunnan Province

SW China

has long experienced the effects of eutrophication and cyanobacterial blooms. To mitigate the eutrophication of Dianchi Lake

various efforts have been implemented since 2000

including reducing nutrient inputs

re-establishing aquatic macrophytes in lakeside zones

manipulating fishes and so on. However

little is known about the changes in its ecosystem structure and function after long-term efforts of eutrophication management in the lake. Therefore

this study on such changes was conducted by comparing the field data-based Ecopath models between 2009 and 2019

a decade marked by a rapid implementation of eutrophication management policies. Results show that both top-down and bottom-up processes have influenced the ecosystem structure and function. First

over this decade

nutrient reduction significantly reduced phytoplankton biomass by 49.4%. Nutrient recycling and path length in food web began to decrease

as indicated by the decrease of Finn’s cycling index and Finn’s mean path length. Secondly

fishing management strategy has greatly changed the composition of fish assemblage

which was dominated by the small zooplantivorous fishes with ecological niche overlapping with shrimps. In general

the stability of the ecosystem has been decreasing

due to the dramatic decrease in zooplankton biomass (83.67%) and hence a collapse of the microbial loop in the food web. Therefore

we strongly advocate the persistent efforts to mitigate the risk of recurrent cyanobacteria blooms in Dianchi Lake

necessitating stricter regulation of nutrient levels and implementing effective fish population management techniques.

关键词

Keywords

references

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