THE FLUCTUATIONS OF PHYSICOCHEMICAL FACTORS AND PHYTOPLANKTON POPULATIONS OF URMIA LAKE, IRAN
作者： R Ahmadi , L Esmaeili Dahesht , H Negarestan , F Mohebi , A Imanifar
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摘要: Urmia Lake is one of the two large hypersaline lakes in world which have Artemia. It located northwest Iran. Due to a decrease water inflow and volume, salinity has reached more than 300 g.l -1 since 2001. The increased greatly influenced biological aspects lake, caused lake undergoes at critical conduction. aim present study was investigate distribution fluctuations phytoplanktons selected physicochemical factors relation Artemia during 8 months. Statistical analysis mean values ion concentrations phytoplankton abundance indicated significant differences among sampling minimum maximum for were, as Cl - 176.2-201.3 , CO 2 95-175mg.l dissolved oxygen (DO) 0.1-2.8 mg.l HCO 3 � 144-496 PO 4 2+ 104-875 NO 330-4104 4-21.5 SO 2- 10490-29840 Ca 561-1606 Mg 3649-14587 while hardness 21000- 62000 . Fourteen genera included Bacillariophyceae (10 genera), Chlorophyceae (2 genera) Cyanophyceae were identified period. smallest average density 97249 L observed December 2005 greatest 481983 August 2005. Dunaliella sp. composed 92.1% lake's phytoplankton. showed difference different months (p< 0.05).
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