تعيين تركيب و فراواني فيتوپلانكتوني درياچه سد شهيد عباسپور و تاثير عوامل محيطي در بهار و تابستان

Composition and Frequency of phytoplankton in shahid Abbaspour Reservior and influence environmental factors in Spring and Summer

Studies of planktons, in particular studies focusing on the diversity and density of phytoplankton existing in water resource ,are the most basic studies in the realm of ecology and related environmental studies. For the length of six months period starling from Farvardin ending in Shahrivar 13K4 (representative of two different ecological seasons, namely spring and summer). Some water samples were taken from six site stations located in Abbaspour Reservoir using the standard methods. The sample comprised of surface water and deep water {often meters in depth). This study also has investigated and measured the existence of Abiotic factors in water such as nitrates, phosphor, oxygen, opaqueness, TDS. water temperature. EC and water salinity. Subsequently the study has examined the effect on the composition of phytoplankton of each of these factors. During this sample survy, 16 Genus from 13 families belonging to five phylum of phytoplankton were identified. Of these species.sixbelonged to phylum of baeillariophyia.one to chiysophyla.four to eyanophyta.four to dinophyta and one to ehlorophyta.The survey results indicate that phylum of dinophyta demonstrated the largest density of phytoplanklons in two seasons while the phylum of chlorophyta showed the least density. The spring survey result indicates that the phylum of bacillariophyla gels second rank after dinophyta phylum, while the finding for the summer survey show that members of cyanophyta phylum rank second after Baeillariophyta in terms of density of planktons. The result of study on Abiotic Factors and their effects on phytoplankton indicate that the Abbaspour Reservoir can be considered relatively fertile (oligo-mezotrophic). As such, if adequate care is taken to protect this reservoir with modem technique. One can advocate the feasible nature of Abbaspour Reservoir for the extension of aquaeulture activities particularly in the light of abiotic factors existing in the reservoir