The Investigation of Water Quality of ？yidere and ？iftekavak Streams Using Physico-Chemical and Biotic Indexes

The investigation was carried out on the Streams of ？iftekavak and ？yidere in Rize between April 2010 and March 2011. Water samples were taken monthly from the station which chosen six sample points on ？yidere and two sample point on ？iftekavak Stream. Water quailty was evaluated with the standard physicochemical analysis (water temperature, pH, dissolved oxygen, oxygen saturation, electrical conductivity, suspended solid, total hardness, Ca hardness, Mg hardness, biological oxygen demand, nitrite nitrogen, total phosphate) like parameters were determined according to the Inland Water Resources Criteria, Water Pollution Control Regulation. With this study, it was aimed to determine the water quality of 8 stations at ？yidere and ？iftekavak Streams. It had been determined that the physicochemical data were not contaminated with ？yidere grade. However, ？iftekavak Stream had been determined that the pollution be under threat at the level. Benthic macroinvertebrates were analysed and compared with the measurement of parameter. In this study, as biomarker indexes, seven different biotic index such as SI (Saprobi Index), FBI (Family Biotik Index), BMWP (Biological Monitoring Index Scores), BBI (Belgium Biotic Index), ASPT (Medium Taxon Index) and EPT (Ephemeroptera Per Taxon) taxon number were used in evaluation. During the period of this study, 27 taxas which belong to Ephemeroptera, Amphipoda, Tricladida, Coleoptera, Decapoda, Rhynchobdellida, Odonata, Diptera, Trichoptera, Plecoptera, Tubificida and Arthropoda were identified. The Ephemeroptera taxa was the highest abundance values in benthic macroinvertebrates. With this study, it was aimed to determine the water quality at 8 stations at ？iftekavak and ？yidere. Both biologic and physicochemical yields were found to result in unpollution of the ？yidere Stream level. However, ？iftekavak stream was found to be under the threat of pollution