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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Spatial variation of phytoplankton composition, biovolume, and resulting microcystin concentrations in the Nyanza Gulf (Lake Victoria, Kenya)
Hydrobiologia, Volume 691, No. 1, Year 2012
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Description
The Nyanza Gulf is a large shallow bay of Lake Victoria suffering from eutrophication by human activities. In order to characterize the harmful algal bloom formation as a consequence of eutrophication, both spatially and seasonally, environmental conditions, phytoplankton community composition, and microcystin (MC) concentrations were investigated monthly from Kisumu Bay, and bimonthly from the center of the gulf, as well as quarterly from the Rusinga Channel and the main basin of Lake Victoria between July 2008 and September 2009. The sites located in Kisumu Bay and the central gulf were most strongly affected by eutrophication, including increased nutrient concentrations and phytoplankton growth. More than 90% of the samples obtained from the gulf were dominated by cyanobacteria, whereas diatoms only dominated in the samples obtained from Rusinga Channel and the main lake. In general, Microcystis accounted for the largest part (>50-90%) of cyanobacterial biovolume. MCs were found in 35 (54%) out of 65 samples and were detected throughout the study period in the gulf, but only in two out of eight samples from the Rusinga Channel and the main lake. A significant linear relationship between Microcystis biovolume and MC concentration was observed (n = 65, R 2 = 0.88, P < 0.001). The highest MC concentrations were recorded in Kisumu Bay between November and March (max. 81 μg l -1) when Microcystis showed max. biovolume (18 mm 3 l -1 in November 2008). The results suggest that seasonal variability did not outweigh the spatial differences in phytoplankton composition and MC production, which is seasonally persistent in Kisumu Bay. © 2012 The Author(s).
Available Materials
https://efashare.b-cdn.net/share/pmc/articles/PMC3968937/bin/10750_2012_1062_MOESM1_ESM.pdf
Authors & Co-Authors
Sitoki, Lewis M.
Kenya, Mombasa
Kenya Marine and Fisheries Research Institute
Austria, Innsbruck
Universität Innsbruck
Kurmayer, Rainer
Austria, Vienna
Osterreichische Akademie Der Wissenschaften
Rott, Eugen
Austria, Innsbruck
Universität Innsbruck
Statistics
Citations: 101
Authors: 3
Affiliations: 3
Identifiers
Doi:
10.1007/s10750-012-1062-8
ISSN:
00188158
e-ISSN:
15735117
Study Locations
Kenya