Does the potentially toxic cyanobacterium Microcystis exist in the soda lakes of East Africa?
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Presently, the food chains of the famous saline alkaline flamingo-lakes of East Africa are the focus of intense scientific discussion as the lakes host toxic cyanobacteria, which when consumed by Lesser Flamingos, weaken the birds and therefore make them susceptible to attacks by infective diseases. The distribution, genetic and toxicological aspects of Microcystis in Kenya has been studied extensively. Although there are reports on the occurrence of Microcystis in Kenya’s hypersaline alkaline lakes, they have not been confirmed. Our investigations carried out over a 10-year period in about 50 inland waters showed that Microcystis occurs exclusively in freshwaters, but never in the hypersaline alkaline lakes. Microscopic examinations of the phytoplankton of these lakes revealed the presence of Anabaenopsis abijatae (Nostococales) whose lumpy structure makes it roughly similar to Microcystis when viewed under an inverted microscope. We conclude that the possible occurrence of Microcystis in hypersaline alkaline lakes is doubtful and, as such, confirmatory studies including microphotographic documentation of findings should be carried out.
KeywordsAnabaenopsis East Africa Lesser Flamingo Microcystis Soda lakes Toxic cyanobacteria
We thank the Government of Kenya for permission to carry out this research (No. MOEST 13/001/31 C 90). We are grateful to the German Federal Ministry of Education and Research for its financial support (grant No. 01LC0001). Our sincere appreciation is also due to the County Councils of Koibatek and Baringo Districts and the Kenya Wildlife Service for granting us access to lakes Bogoria and Nakuru. Our gratitude is also due to Andreas Ballot, William Kimosop, and Hedy Kling, for their valuable input and useful discussions.
- Ballot, A., S. Pflugmacher, C. Wiegand, K. Kotut & L. Krienitz, 2003. Cyanobacterial toxins in Lake Baringo, Kenya. Limnologica 33: 2–9.Google Scholar
- Bowman, J. S. & J. P. Sachs, 2008. Chemical and physical properties of some saline lakes in Alberta and Saskatchewan. Saline Systems. http://www.salinesystems.org/content/4/1/3.
- Cronberg, G. & L. Van Baalen, 2004. Microcystis botrys and M. toxica—the same species? In 16th Symposium of the International Association for Cyanophyte Research, Luxembourg 2004. Abstracts, p. 31.Google Scholar
- Githaiga, J. M. 2003. Ecological factors determining utilization patterns and inter-lake movements of the flamingos in Kenyan alkaline lakes. Ph.D Thesis, University of Nairobi: 228 pp.Google Scholar
- Harper, D. M., R. B. Childress, M. M. Harper, R. R. Boar, P. H. Hickley, S. C. Mills, N. Otieno, T. Drane, E. Vareschi, O. Nasirwa, W. E. Mwatha, J. P. E. C. Darlington & X. Escuté-Gasulla, 2003. Aquatic biodiversity and saline lakes: Lake Bogoria National Reserve, Kenya. Hydrobiologia 500: 259–276.CrossRefGoogle Scholar
- Hindák, F., 2006. Three planktonic cyanophytes producing water blooms in Western Slovakia. Czech Phycology, Olomouc 6: 59–67.Google Scholar
- Kebede, E., 2002. Phytoplankton distribution in lakes of the Ethiopian Rift Valley. In Tudorancea, C. & W. D. Taylor (eds), Ethiopian Rift Valley Lakes. Biology of Inland Waters Series. Backhuys Publishers, Leiden: 61–93.Google Scholar
- Kebede, E. & E. Willén, 1996. Anabaenopsis abijatae, a new cyanophyte from Lake Abijata, an alkaline, saline lake in the Ethiopian Rift Valley. Algological Studies 80: 1–8.Google Scholar
- Komárek, J. & K. Anagnostidis, 1998. Cyanoprokaryota, 1. Teil Chroococcales. In Ettl, H., G. Gärtner, H. Heynig & D. Mollenhauer (eds), Süßwasserflora von Mitteleuropa 19/1. Gustav Fischer, Jena: 548 pp.Google Scholar
- Komárek, J. & J. Komárková, 2002. Review of the European Microcystis-morphospecies (Cyanoprokaryotes) from nature. Czech Phycology, Olomouc 2: 1–24.Google Scholar
- Kotut, K., A. Ballot & L. Krienitz, 2006. Toxic cyanobacteria and their toxins in standing waters of Kenya: implications for water resource use. Journal of Water & Health 4: 233–245.Google Scholar
- Kotut, K., A. Ballot, C. Wiegand & L. Krienitz, 2010. Toxic cyanobacteria at Nakuru sewage oxidation ponds—a potential threat to wildlife. Limnologica 40: 47–53.Google Scholar
- Krienitz, L., A. Ballot, C. Wiegand, K. Kotut, G. A. Codd & S. Pflugmacher, 2002. Cyanotoxin-producing bloom of Anabaena flos-aquae, Anabaena discoidea and Microcystis aeruginosa (Cyanobacteria) in Nyanza Gulf of Lake Victoria, Kenya. Journal of Applied Botany 76: 179–183.Google Scholar
- Krienitz, L., A. Ballot, K. Kotut, C. Wiegand, S. Pütz, J. S. Metcalf, J. S., G. A. Codd & S. Pflugmacher, 2003. Contribution of hot spring cyanobacteria to the mysterious deaths of Lesser Flamingos at Lake Bogoria, Kenya. FEMS Microbiology Ecology 43: 141–148.Google Scholar
- Motelin, G., R. Thampy & D. Doros, 2000. An ecotoxicological study of the potential roles of metals, pesticides and algal toxins on the 1993/5 Lesser Flamingo mass die-offs in Lake Bogoria and Nakuru, Kenya; and the health status of the same species of birds in the Rift Valley Lakes during the 1990s. In Proceedings of the East African Environmental Forum, Nairobi, May 11–12, 2000.Google Scholar
- Ostenfeld, C. H., 1908. Phytoplankton aus dem Victoria Nyanza. Engler’s Botanische Jahrbücher 41: 330–350.Google Scholar
- Semyalo, R., T. Rohrlack, D. Kayiira, Y. S. Kizito, S. Byarujali, G. Nyakairu & P. Larsson, 2011. On the diet of Nile tilapia in two eutrophic tropical lakes containing toxin producing cyanobacteria. Limnologica 41: 30–36.Google Scholar
- Wilson, A. E., O. Sarnelle, B. A. Neilan, T. P. Salmon, M. M. Gehringer & M. E. Hay, 2005. Genetic variation of the bloom-forming cyanobacterium Microcystis aeruginosa within and among lakes: implications for harmful algal blooms. Applied Environmental Microbiology 71: 6126–6133.CrossRefGoogle Scholar