Author/Authors :
Hassan, Fikrat M. University of Baghdad - College of Science for Women - Department of Biology, Iraq , Al-Saadi, Hussein A. University of Baghdad - College of Science for Women - Department of Biology, Iraq , Alkam, Foad M. University of Qadisiyia - College of Education - Department of Biology, Iraq
Abstract :
Nutrient enrichment of Sawa lake water was made using different nitrogen and phosphorus concentrations during autumn and spring at three stations. Different concentrations of nitrogen, phosphorus and N: P ratios were used to test variations in phytoplankton population dynamics. Nitrogen at a concentration of 25 μmole.l-1 and N: P ratio of 10:1 gave highest phytoplankton cell number at all stations and seasons. A total of 64 algal taxa dominated by Bacillariophyceae followed by Cyanophyceae and Chlorophyceae were identified. The values of Shannon index of diversity were more than one in the studied stations.
