Seasonal variations in the taxonomic compositioncan be explained by the stability of the water column(Berger et al., 2006) and the long period of waterretention during long dry season in the reservoirsproviding excellent conditions of temperature andirradiation (Bouvy et al., 2000). Decreasing ofspecies richness with the rainy season might beattributable to the reduced nutrient charge,dilutional effects of rain (Kouassi et al., 2013) andthe current velocity. The hight occurrence ofMicrocystis aeruginosa during dry seasons seems tobe associated with the fact that this species, a Sstrategistorganism (Reynolds, 1997) is well adaptedto grow at the high light intensity of the surfacewaters
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