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Aquatic Ecology

, Volume 53, Issue 1, pp 61–77 | Cite as

The influence of El Niño-induced drought on cyanobacterial community structure in a shallow tropical reservoir (Koka Reservoir, Ethiopia)

  • Samson TilahunEmail author
  • Demeke Kifle
Article

Abstract

Koka Reservoir in Ethiopia has been severely impacted by water quality deterioration associated with harmful algal blooms. As a large proportion of the annual nutrient budget of the reservoir is believed to be of riverine origin, nutrient availability is presumably largely influenced by rainfall pattern and hydrological cycles, which are related to changes in climatic conditions such as El Niño-induced drought. The effect of El Niño-induced drought, which occurred in 2015, on the cyanobacterial community structure of Koka Reservoir was, therefore, investigated from May 28, 2015 to April 28 2016. The drought caused the failure of the main rainy season, which expectedly caused reduction in the external input of nutrients and changes in other limnological conditions of the reservoir. These changes, particularly nitrogen limitation, triggered the unusual dominance of the diazotrophic cyanobacterial genus Cylindrospermopsis over the previously persistently dominant nondiazotrophic genus, Microcystis, in the reservoir.

Keywords

Climate change Cylindrospermopsis Diazotrophic Microcystis Nutrient limitation 

Notes

Acknowledgements

Financial support for the corresponding author was provided by USAID and Addis Ababa University.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary material

10452_2019_9673_MOESM1_ESM.docx (1.4 mb)
Supplementary material 1 (DOCX 1477 kb)

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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  1. 1.Ethiopian Institute of Water ResourcesAddis Ababa UniversityAddis AbabaEthiopia
  2. 2.Aquatic Sciences, Fisheries and Aquaculture Stream, Department of Zoological SciencesAddis Ababa UniversityAddis AbabaEthiopia

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