Abstract
The concentrations and spatial distributions of different pollutants, including ammonia, Biochemical Oxygen Demand (BOD5), Chemical Oxygen Demand (COD), Cyanide, Dissolved Oxygen (DO), oil and grease (n-Hexane extract), Phenol, and Heavy metals (As, Cd, Cu, Cr, Hg, Pb and Ni ) were investigated in water and sediment samples collected from eight stations at Gizri creek. The concentration of many of these pollutants was quite alarming except Cr, Pb and Ni in water and sediment samples. A total of 138 species of flora and fauna were recorded from 7 different sampling sites of Gizri creek. Ecological survey of the benthic communities revealed that the pollutants are responsible for the degradation of natural ecosystem of the creek, which has consequently resulted in reduced biodiversity of the ecosystem.
