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Impact of water level fluctuations on the development of phytoplankton in a large subtropical reservoir: implications for the management of cyanobacteria

Abstract

Lake water level fluctuations (WLF) are an important factor driving the selection and seasonal dynamics of phytoplankton and potentially toxigenic cyanobacteria. Nevertheless, the relative importance of environmental drivers connected to WLF may be completely different, depending on the typology and use of waterbodies, latitude and climatic regimes. In this study, we investigated the impact of WLF in a large subtropical reservoir in south-eastern China (Hongfeng Reservoir, Guizhou Province). The study was based on monthly samplings carried out in 2014 in six stations. The strong increase in the water level observed in early summer caused a radical shift in the phytoplankton community. While in the pre-flooding period phytoplankton was composed of large diatoms, chrysophytes and Oscillatoriales (mostly Limnothrix sp.), the post-flooding period showed an increase in smaller and more competitive chlorophytes, smaller diatoms and cryptophytes better adapted to a fast colonisation of new and nutrient-rich environments. The environmental drivers that drove the change were dilution, flushing and interference with the seasonal water stratification processes. We concluded that, because WLF represents a complex variable integrating different physical effects in one explanatory descriptor, its value as a predictor of phytoplankton and cyanobacteria dynamics in lake ecosystems is difficult to generalise and needs to be investigated on a case-by-case basis. For this reason, considering the year-to-year hydrological variability that potentially characterise reservoirs, definite indications for management should be outlined considering more than 1-year study.

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Acknowledgements

The data on the lake level fluctuations were provided by the administration of Hongfeng, Baihua and Aha reservoirs.

Funding

This work was financed by the Natural Science Foundation of China (41163005), the Department of Science and Technology of Guizhou Province ([2015]2001, [2015]10, [2014]7001, [2014]7058), and the Water Resources Department of Guizhou Province [KT201401]. The first author received a scholarship from the China Scholarship Council to fund a research visit to Fondazione E. Mach—Istituto Agrario di S. Michele all’Adige.

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Correspondence to Qiuhua Li or Nico Salmaso.

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Responsible editor: Philippe Garrigues

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Li, Q., Xiao, J., Ou, T. et al. Impact of water level fluctuations on the development of phytoplankton in a large subtropical reservoir: implications for the management of cyanobacteria. Environ Sci Pollut Res 25, 1306–1318 (2018). https://doi.org/10.1007/s11356-017-0502-4

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  • DOI: https://doi.org/10.1007/s11356-017-0502-4

Keywords

  • Water level fluctuations
  • Flooding
  • Subtropical reservoirs
  • Phytoplankton
  • Cyanobacteria
  • Morpho-functional groups
  • Lake management
  • Drinking water