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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
engineering
Phytoplankton growth control and risk of cyanobacterial blooms in the lower Senegal River delta region
Water Research, Volume 42, No. 4-5, Year 2008
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Description
Eutrophication, and the resulting proliferation of phytoplankton can affect water quality. Although environmental and ecological processes that lead to phytoplankton proliferations in temperate areas have received considerable attention, scientific background regarding this topic in tropical areas, especially West Africa, are scarce. In this study, bioassays in batch cultures were carried out in order to identify factors that may be stimulating or limiting the biomass of phytoplankton at various sites in the lower Senegal River delta region. Complete factorial designs were used to test several factors both alone and combined (nitrogen, phosphorus, sulfate, EDTA and trace elements, stirring). The effects of these factors on the growth of the whole phytoplankton communities were followed by the daily measurement of in vivo fluorescence. At all but two of the sites, enrichment with certain nutrients significantly stimulated phytoplankton biomass growth, with nitrogen and/or phosphorus appearing to be the primary limiting factor(s). Nitrogen was the primary limiting factor in coastal ocean waters and in the Senegal River estuary. In the freshwater ecosystems studied, nitrogen and phosphorus acted as alternating or concomitant limiting factors. We assessed the changes in the phytoplankton composition induced by nutrient enrichments in Lake Guiers, a drinking water reservoir for the population of Dakar. Our findings lead us to define the conditions of a possible proliferation of the potentially toxic cyanobacterium Cylindrospermopsis raciborskii mainly in response to phosphorus inputs. © 2007 Elsevier Ltd. All rights reserved.
Authors & Co-Authors
Quiblier, Catherine
France, Paris
Museum National D'histoire Naturelle
France, Paris
Université Paris Cité
Leboulanger, Christophe
France, Sete
Marbec Marine Biodiversity, Exploitation and Conservation
France, Thonon-les-bains
Centre Alpin de Recherche Sur Les Réseaux Trophiques et Les Ecosystèmes Limniques Carrtel
Sané, Seyni
Senegal, Dakar
Institut de Recherche Pour le Développement Dakar
Dufour, Philippe
France, Thonon-les-bains
Centre Alpin de Recherche Sur Les Réseaux Trophiques et Les Ecosystèmes Limniques Carrtel
Statistics
Citations: 45
Authors: 4
Affiliations: 5
Identifiers
Doi:
10.1016/j.watres.2007.09.030
ISSN:
00431354
Research Areas
Environmental
Study Design
Cross Sectional Study
Study Locations
Multi-countries
Senegal