TAXONOMIC STUDY OF DIATOMS IN ZAYANDEH ROOD DAM LAKE

Diatoms samples in Zayandeh Rood Dam Lake were taken in four stations from surface, ۰.۵ and ۳ m depths of water in three replicate by Nansen sampler. Additional samples were taken from the surface with plankton net. Diatoms samples fixed with ۴% formaldehyde and were concentrated and identified using microscope at ۴۰۰ x. Salinity, NO۳, PO۴ and SO۴ were measured using standard methods (APHA). In the present study, ۵۳ species and ۲۳ genera were identified. Nitzschia was dominant genera with ۱۲ species and Cyclotella meneghiniana Kutz. was dominant species in all stations and seasons. Temperature, pH, EC and DO were measured at site. The study revealed that, the Zayandeh Rood Dam lake is an oligo- mesotrophic water body.

Keywords:

Diatoms , Zayandeh Rood Dam Lake , Oligo-mesotroph , Iran