Journal of Applied Phycology

, Volume 26, Issue 4, pp 1689–1699 | Cite as

DO, pH, and Eh microprofiles in cyanobacterial granules from Lake Taihu under different environmental conditions

  • Fei Fang
  • Liuyang Yang
  • Lin Gan
  • Liyun Guo
  • Zhixin Hu
  • Sijia Yuan
  • Qiankun Chen
  • Lijuan Jiang


To understand characteristics of cyanobacterial granules from Lake Taihu, dissolved oxygen (DO), pH, and redox potential (Eh) microelectrodes were used to investigate physiological responses within these granules under different irradiance, temperature, and external pH levels. DO and pH levels increased with rising irradiance, while the Eh had an opposite trend. High light combined with high temperature decreased photosynthesis of the cyanobacterial granules. DO diffused from the surrounding water to the granules at low irradiance; however, DO began to diffuse from the granules to the water at high irradiance owing to increased photosynthesis. Dynamic changes of DO, pH, and Eh levels existed within the cyanobacterial granules under light–dark cycles. High DO levels within intercellular space of the cyanobacterial granules are another important buoyancy regulation mechanism. An external initial pH affected photosynthesis of the cyanobacteria in the granules. DO and pH levels of the granules in slightly alkaline solution (pH 8–9) were higher than those in highly alkaline solution (pH 10). Such physical and chemical characteristics within cyanobacterial granules in eutrophic water allowed them to outcompete other aquatic algae. The characterization of the physiological microenvironment within these cyanobacterial granules provides a new research approach to a better bloom management.


Microprofiles DO pH Eh Cyanobacterial granule Water bloom 



This work has been supported by grants from the National Special Program of Water Environments (2012ZX07101006) and the National Basic Research Program of China (2008CB418102).


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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • Fei Fang
    • 1
  • Liuyang Yang
    • 1
  • Lin Gan
    • 1
  • Liyun Guo
    • 1
  • Zhixin Hu
    • 1
  • Sijia Yuan
    • 1
  • Qiankun Chen
    • 1
  • Lijuan Jiang
    • 1
  1. 1.State Key Laboratory of Pollution Control and Resource Reuse, School of the EnvironmentNanjing UniversityNanjingChina

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