African Journal of Aquatic Science

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Cyanobacteria and cyanotoxins in the source water from Lake Chivero, Harare, Zimbabwe, and the presence of cyanotoxins in drinking water

Lindah Mhlanga, Jenny Day, Gertrud Cronberg, Moses Chimbari, Nqobizitha Siziba, Heléne Annadotter


The phytoplankton community and cyanotoxins in Lake Chivero (formerly Lake McIlwaine) and the presence of cyanotoxins in treated drinking water were investigated between 2003 and 2004. A typical seasonal succession of Cyanobacteria species occurred from January to April, Bacillariophyta from May to July, and Cryptophyta and Chlorophyta from August to December. Microcystis aeruginosa and M. wesenbergii, known producers of the toxin microcystin, and the non-toxic cyanobacterium M. novacekii dominated during summer. The highest concentrations of microcystins and lipopolysaccharide endotoxins occurred when cyanobacterial biomass was highest. Lipopolysaccharide endotoxin concentrations in the lake ranged between 8 and 3 200 Endotoxin Units (EU) ml–1. Microcystin concentrations in treated water were below the recommended safe limit for drinking water. Lipopolysaccharide endotoxin concentrations in treated water ranged from 0.15 to 11 EU ml–1. The phytoplankton community comprised non-microcystin-producing species for the greater part of the study period.

Keywords: cyanotoxins; dominant organisms; endotoxins; LPS; microcystins; phytoplankton

African Journal of Aquatic Science 2006, 31(2): 165–173
AJOL African Journals Online