Field studies on the protozoan distribution in Damietta and Rosetta branches of the River Nile, Egypt

This study was carried out during a period extending between February 2016 and January 2017 in both Damietta and Rosetta branches of the Nile. Water samples were collected at eight sampling sites; four at Damietta and the others at Rosetta branch so as to detect the variability of the protozoan organisms and evaluate some physico-chemical parameters. It was proved that the protozoan genera of Rosetta branch showed more diverse as compared with those of Damietta one ( 46 and 35 genera respectively). These organisms were belonging to three main phyla ; Sarcodina, Mastigophora and Ciliophora where the latter predominated the preceding two phyla at the various sampling sites in both river branches. Simultaneously, organic matter, ammonia and nitrates exhibited higher levels in Rosetta than Damietta, while phosphates, dissolved oxygen and p H behaved in an antagonistic manner at the different seasons. The abundance of the sewage protozoan organisms was higher in Rosetta branch relative to those of Damietta which could be attributed mostly to the illegal runoff of the sewage wastes from certain villages on Rosetta branch that consequently affect oxygen and organic matter contents at these stations. These unicellular organisms were influenced and proved to be statistically significant to a certain limit with water temperature, phosphate salts, ammonia and organic matter.