Distribution and species diversity of Cyanophyta (Cyanobacteria) and their environmental significance in aquatic life in Anzali wetland ecosystem

This study was carried out in 27 study stations in Shijan, Siahkishim, Abkenar, Hendekhaleh and Rogaha(River outlets), during conducting research hydrology  and  hydrobiology and preparing Atlas of  plankton in the Anzali wetland during the years 1994 from 2014. Sampling was done by (P.V.C) tube, For phytoplankton (1 liter of  water sampels) were Collected and fixed with 4% formalin and then transferred to the laboratory and after quantitative and qualitative studies with inverted microscope were taken picture them by Nikon photo microscop.  In total, 19 genus and 32 species were identified in the Cyanophyta. This phylum includes a category known as Myxophyceae, commonly called the "Blue Green Algae", The  most  abundant  species of Cyanophyta are Oscillatoria sp. ,Merismopedia  convoluta ,Microcystis  aeruginosa and  Anabaena spiroides. All members of this category have maximum frequency in the summer and early autumn seasons (October), and their most frequent distribution is in the Abkenar area. In general, the purpose of  this research  was  to  determine  the  role  and  importance  of  the environmental management of this group in Anzali wetland ecosystem. also, by studying  the  population, biomass  and  distrbution of  plankton  in  different areas  of  this  wetland, the production  and  fertility potential were evaluated  and  its environmental  effects in fish life have been met to restore the natural reproduction sites of migratory fish and feeding their larvae.