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Phytoplankton community structure and environment in the Kenyan waters of Lake Victoria

Lung'Ayia, Henry B.O. and M'Harzi, A. and Tackx, Micky and Gichuki, John and Symoens, J. J. Phytoplankton community structure and environment in the Kenyan waters of Lake Victoria. (2000) Freshwater Biology, 43 (4). 529-543. ISSN 0046-5070

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Official URL: http://onlinelibrary.wiley.com/doi/10.1046/j.1365-2427.2000.t01-1-00525.x/full

Abstract

1. Phytoplankton species composition, numerical abundance, spatial distribution and total biomass measured as chlorophyll a concentration were studied in relation to environmental factors in September 1994 (dry season) and March 1995 (rainy season), respectively, in the Kenyan waters of Lake Victoria; 103 species were recorded. 2. Blue-green algae (Cyanophyceae) were most diverse, followed by diatoms (Bacillariophyceae), green algae (Chlorophyceae) and dinoflagellates (Dinophyceae). 3. Twinspan separated the phytoplankton communities in the Nyanza Gulf and those in the open lake during both seasons. During the dry season, the Nyanza Gulf was strongly dominated by blue-greens, while diatoms dominated in the open lake. During the rainy season, blue-greens remained dominant in the Nyanza Gulf although the number of species found was lower than during the dry season; in the open lake, blue-greens replaced diatoms as the dominant group and there were more species than in the dry season. 4. Canonical correspondence analysis indicated that the phytoplankton species distribution was significantly correlated with turbidity during the dry season and with SiO2 during the rainy season. Chlorophyll a concentrations ranging from 2.0 to 71.5 mg m-3 in the dry season and 2.0-17.2 mg m-3 in the rainy season confirm earlier reports of increasing phytoplankton biomass in Lake Victoria since the 1960s.

Item Type:Article
Additional Information:Thanks to Wiley editor. The definitive version is available at http://onlinelibrary.wiley.com/ The original PDF of the article can be found at Freshwater Biology website : http://onlinelibrary.wiley.com/doi/10.1046/j.1365-2427.2000.t01-1-00525.x/full
HAL Id:hal-01515930
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > Kenya Marine and Fisheries Research Institute - KMFRI (KENYA)
Other partners > Vrije Universiteit Brussel - VUB (BELGIUM)
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Deposited By: Florence Amor
Deposited On:28 Apr 2017 09:59

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