A Phytoplankton Distribution study of Dukan basin in Sulaimani district -Kurdistan Region of Iraq.

Trifa Kamal Farkha and Adil Othman Fatah
Faculty of Science and Science education-University of Sulaimani, Kurdistan Region of Iraq


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).

Key Words:
Surface water,
Dukan basin,


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