Species diversity and ecological studies Euglenophyta in the Zayandeh Rood lake dam

Zayandeh Rood Lake, as the largest Isfahan natural Lake, is located in the west of Isfahan city with the area of about 48 km2. Sampling of Euglenophyta was done in four stations from August 2005 through June 2006. Ecological factors such as pH, EC, salinity, temperature and various nutrients were measured. A total of 4 genus and 9 species were identified in this lake. Euglena proxima Dang., Phacus caudatus var. ovalis Drez. and Trachelomonas robusta Swir., showed high density 1420, 952, 2380 cell/cm3, respectively. In this lake density of Euglenophyta increased in warm seasons because of high ions such as nitrate and phosphate. Based upon algal flora results, Zayandeh Rood dam lake could be regarded as an oligo-mesotrophic lake.