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Plankton composition, biomass, phylogeny and toxin genes in Lake Big Momela, Tanzania
Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences.
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Number of Authors: 5
2017 (English)In: African Journal of Aquatic Science, ISSN 1608-5914, E-ISSN 1727-9364, Vol. 42, no 2, 109-121 p.Article in journal (Refereed) Published
Abstract [en]

Lake Big Momela, one of the East African soda lakes in Northern Tanzania characterised by highly saline-alkaline conditions, making them inhospitable to a range of organisms, although supporting massive growths of some adapted planktonic microorganisms that serve as food for birds, such as Lesser Flamingo. The temporal dynamics of plankton, with an emphasis on cyanobacteria, were examined in 2007 using morphological traits and ribosomal genetic markers (16S and 18S rRNA). Cyanobacterial genes encoding for hepatotoxins (mcyE and ndaF) were also screened. Rotifers and copepods dominated the zooplankton, whereas cyanobacteria, such as Anabaenopsis elenkinii and Arthrospira fusiformis dominated the phytoplankton community, and these being related to representatives in other East African soda lakes. The cyanobacteria community also showed distinct seasonal patterns influenced by environmental parameters, mainly salinity, pH and nitrate. Significant positive correlations were found between phytoplankton abundance and nitrate concentrations (r = 0.617, p = 0.033). No signals of the hepatotoxin synthetase genes mcyE and ndaF were retrieved from cyanobacteria during the whole year. In general, our data illustrate the presence of rich planktonic communities, including some unique and potentially endemic cyanobacteria.

Place, publisher, year, edition, pages
2017. Vol. 42, no 2, 109-121 p.
Keyword [en]
cyanotoxin, limnology, plankton diversity, soda lakes
National Category
Biological Sciences
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URN: urn:nbn:se:su:diva-148106DOI: 10.2989/16085914.2017.1334621ISI: 000410575700003OAI: oai:DiVA.org:su-148106DiVA: diva2:1150328
Available from: 2017-10-18 Created: 2017-10-18 Last updated: 2017-10-18Bibliographically approved

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CiteExportLink to record
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