Abstract
Summary Ankistrodesmus falcatus and Scenedesmus obliquus isolated from the Nile water were grown under N-limitation over a wide range of dilution rates. This study was performed in two identical chemostat devices with working volume of 1.61 1 for A. falcatus and 1.53 1 for S. obliquus . The results showed that the growth rate of each algal species depends on the N-concentration. This was described by a saturation curve after the type of Monod equation. The half-maximum growth rate for A. falcatus and S. obliquus needed 210.7 μg N · 1 −1 and 105.2 μg N · 1 −1 , respectively. This shows that the patterns of yield coefficient and production rate for each algal species are opposite each other with respect to dilution rates. The growth of the two algal species in Nile water system under low concentrations of nitrogen was also discussed.
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