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1. Initation of different phytoplankton groups by inorganic nutrients, nutrient enrichment bioassays using the addition of iron (Fe) and the combined addition of nitrogen and phosphorus (NP) were carried out in the north and the south of Lake Tanganyika during the rainy and dry seasons in 2003 and 2004. 2. Nutrient additions resulted in an increase in phytoplankton growth rate relative to control treatments in all experiments. HPLC pigment data and epifluorescence microscopy counts indicated differential stimulation of the dominant phytoplankton groups. Iron additions mainly stimulated prokaryotic picophytoplankton, while enrichments with nitrogen and phosphorus stimulated green algae and in some cases diatoms. Extended incubation (3 days) indicated co-limitation of Fe and NP, in particular for picocyanobacteria

BR Staff Publications [a] (paper in international, peer reviewed journal) --- lake Tanganyika --- nutrient limitation --- iron --- phytoplankton --- picocyanobacteria