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Article

The Assessment of Phytoplankton Dynamics in Two Reservoirs in Southern Africa with Special Reference to Water Abstraction for Inter-Basin Transfers and Potable Water Production

1
Research and Development Department, Namibia Water Corporation, 176 Iscor Street, Northern Industrial Area, Windhoek 13389, Namibia
2
Faculty of Science, Stellenbosch University Water Institute, Stellenbosch University, Matieland 7600, South Africa
3
Centre for Environmental Management, Faculty of Natural and Agricultural Sciences, University of the Free State, Bloemfontein 9300, South Africa
4
Department of Paraclinical Sciences, Faculty of Veterinary Science, University of Pretoria, Pretoria 0110, South Africa
*
Author to whom correspondence should be addressed.
Academic Editor: Sophia Barinova
Water 2021, 13(21), 3045; https://doi.org/10.3390/w13213045
Received: 29 September 2021 / Revised: 25 October 2021 / Accepted: 26 October 2021 / Published: 1 November 2021
(This article belongs to the Special Issue Assessment of Water Quality)
Toxic phytoplankton in the aquatic ecosystems are dynamic, affecting water quality. It remains unclear as to how possible toxic phytoplankton assemblages vary vertically and temporally in Swakoppoort and Von Bach dams, located in a dry subtropical desert region in central Namibia. The following variables were analyzed: pH, Secchi depths, turbidity, water temperature, total phosphorus, orthophosphate, chlorophyll-a, phytoplankton cells, and water depths. Cyanobacteria dominated the phytoplankton community in the autumn, winter and spring (dry) and summer (wet) seasons, at all the depth ranges in both dams. Microcystis dominated the vertical and temporal dynamics, followed by Dolichospermum. In the dry seasons, higher cyanobacteria cell numbers were observed in comparison to the rainy season in both dams. Spring blooms of cyanobacteria were evident in the Von Bach Dam while autumn and spring cyanobacteria blooms were observed in the Swakoppoort Dam. In the Swakoppoort Dam, the preferable depth ranges for toxic cyanobacteria species were at 5 to 10 m while in the Von Bach Dam at 0 to 5 m range. The findings of the current study indicate that the traditional selective withdrawal of water in the two dams should be performed with vertical and temporal dynamics of possible toxic cyanobacteria accounted for to aid the abstraction of water with the lowest possible toxic phytoplankton numbers, which could lower the public health risk. View Full-Text
Keywords: cyanobacteria; water quality; depth; dynamic; lake; diversity; seasons; semi-arid; subtropical; water abstraction cyanobacteria; water quality; depth; dynamic; lake; diversity; seasons; semi-arid; subtropical; water abstraction
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MDPI and ACS Style

Sirunda, J.; Oberholster, P.; Wolfaardt, G.; Botes, M.; Truter, C. The Assessment of Phytoplankton Dynamics in Two Reservoirs in Southern Africa with Special Reference to Water Abstraction for Inter-Basin Transfers and Potable Water Production. Water 2021, 13, 3045. https://doi.org/10.3390/w13213045

AMA Style

Sirunda J, Oberholster P, Wolfaardt G, Botes M, Truter C. The Assessment of Phytoplankton Dynamics in Two Reservoirs in Southern Africa with Special Reference to Water Abstraction for Inter-Basin Transfers and Potable Water Production. Water. 2021; 13(21):3045. https://doi.org/10.3390/w13213045

Chicago/Turabian Style

Sirunda, Johannes, Paul Oberholster, Gideon Wolfaardt, Marelize Botes, and Christoff Truter. 2021. "The Assessment of Phytoplankton Dynamics in Two Reservoirs in Southern Africa with Special Reference to Water Abstraction for Inter-Basin Transfers and Potable Water Production" Water 13, no. 21: 3045. https://doi.org/10.3390/w13213045

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