A study on diatoms flora of siahrood, Ghaemshahr, Iran

Siahrood The river originates from Alborz Mountains in the province is an important water source for agriculture and economic affairs in the city is GhaemshahrAnd therefore study about the microorganism in this river is the most important for water quality determination.. . Diatoms are the major constituent flora in aquatic ecosystems such as freshwater habitates.. this studies was carried out in siahrood river from jan2012 to jun 2012. Samples were taken from stones and sediments at monthly interval periods. Samples immediately fixed with formaldehyde 4% insitut.for exact recognition,permanent mounts were prepared by using Patrick&Reimer procedure.Indentification of diatoms was done by means of light microscope and specialized recognition keys., counting method is used because in this method, indentification and determination of diatom communities and morphological variations of species are better known.Tem, dissolved oxygen, conductivity, pH, sodium, chloride, bicarbonate, calcium and magnesium were measured in a total of 51 species belonging to 20 genera were identified To interpret the effects of different factors, water stations on a field and cluster analysis was disfigured by Minitab software. Reduce the diversity of diatoms increased from upstream to downstream signal downstream pollution and its impact on a species composition and abundance of diatoms is a river Siahrood.