Büyüksu (Bolu, Türkiye) çayı su kalitesinin bazı çevresel değişkenlerle değerlendirilmesi ve larval Cironomidae (Diptera) tespiti

Environmental quality of Büyüksu Stream evaluated using physicochemical and biological variables obtained from benthic macroinvertebrates. Water samples were collected from eleven different stations between April 2005 and March 2007. During the study in order to investigate pollution level of Büyüksu Stream (Bolu). Selected environmental variables such as pH, temperature, conductivity, dissolved oxygen, nitrate, nitrite, ammonium and phosphate were analyzed and benthic macroinvertebrates were determined.As a result of this study 117 taxa were determined from benthic macroinvertebrates. Out of the 26 species of Chironomidae (4 Tanypodinae, 3 Diamesinae, 10 Orthocladiinae and 9 Chironominae), 3 species (Diamesa insignipes K., Brilla modesta (Mg.) and Cardiocladius capucinus (Zett.)) dominated the fauna.Multivariate analysis methods were used for assessment of data. Frequency and abundant degrees of benthic macroinvertebrates were calculated. Similarities that are among the stations were calculated according to the Sorenson Index. Also, Belgian Biotic Index was used for water quality.Benthic macroinvertebrate fauna which will be used in future biological monitoring studies were identified it?s emphasized that water quality of streams should be determined not only with physicochemical variables but also with biological variables.Results show that Büyüksu stream has been polluted by domestic and agricultural discharges.