tailieunhanh - Seasonal variations in phytoplankton communities in Zayandeh-Rood Dam Lake (Isfahan, Iran)
The density of the phytoplankton was between 470 and 150,470 cells/cm3. According to the Shannon-Weaver Index, the highest and the lowest diversities were determined in November and May, respectively. | Research Article Turk J Bot 36 (2012) 715-726 © TÜBİTAK doi: Seasonal variations in phytoplankton communities in Zayandeh-Rood Dam Lake (Isfahan, Iran) 1 2 Masoumeh SHAMS1,*, Saeed AFSHARZADEH1, Tahir ATICI2 Department of Biology, Faculty of Science, University of Isfahan, Isfahan - IRAN Department of Biology, Faculty of Education, University of Gazi, Ankara - Turkey Received: ● Accepted: Abstract: Variations in the phytoplankton of Zayandeh-Rood Dam Lake were studied seasonally from September 2005 to August 2006 at 4 different stations. A total of 112 species and 53 genera belonging to 6 divisions were identified. The species belonging to Bacillariophyta, Chlorophyta, Cyanophyta, Euglenophyta, and Dinophyta were found frequently. Chrysophyta species were found in low numbers. Cyclotella meneghinina Kütz., a centric diatom, was the dominant species at all stations. The density of the phytoplankton was between 470 and 150,470 cells/cm3. According to the Shannon-Weaver Index, the highest and the lowest diversities were determined in November and May, respectively. Regarding physico-chemical analysis and phytoplankton composition, it seems that Zayandeh-Rood Dam Lake is oligomesotrophic, and some species of phytoplankton can be used as indicators for evaluating water quality. Key words: Phytoplankton, seasonal variation, Zayandeh-Rood Dam Lake, oligo-mesotrophic lake Introduction Although there have been a number of studies carried out in Zayandeh-Rood Dam Lake in Isfahan, Iran (Parvizian, 2003), no taxonomic study giving a general, quantitative description of the seasonal phytoplankton succession in this lake has been done so far. The purpose of the present study was to determine the composition of phytoplankton in Zayandeh-Rood and to contribute to the algal flora of Iran. Algae, especially phytoplankton, are the source of oxygen in aquatic systems and the main autochthonous primary producers used in determining .
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