Abstract
The Phytoplankton species composition have been studied at eight stations from four
 selected streams: Tabin, Charmaga, Chamirezan and Surqawshan in Dukan basin within
 Sulaimani district during August 2010 to July 2011. Some physical and chemical
 properties of the streams water were determined. Air and water temperature values were
 varied between (3 to 43 oC) and (5 to 29 oC) ,respectively. Upon investigation, the pH
 range of the sites was 7-9.4 indicating alkalinity of the water bodies. Calcium
 concentrations always dominated over the other ions. Calcium values were varied
 between (10 to 74 mg/l). Sodium and potassium concentration ranged between (0.66 to
 16.5 mg/l) and (0.3 to 3.4 mg/l) respectively. Chloride concentrations never fall below
 10 mg/l and never exceed 58 mg/l. throughout the studied period. A total of 136
 phytoplankton taxa were identified which belong to six divisions , the majorities were
 belonged to Bacillariophyta (92 taxa), making up 67.65 % of the total, followed by
 Chlorophyta (19 taxa), making up 14.7 %, Cyanophyta (19 taxa) which make up 14 %,(
 2 taxa) for each of Pyrophyta and , Euglenophyta and (1 taxon) of chrysophyta make
 up 3.75% . The most diverse genera that were investigated in this study were: Navicula
 (13 taxa) ,Nitizschia (15 taxa),Fragilaria(9 taxa) , Cymbella and Gomphonema (8 taxa).
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