The Effect of Trophic State and the Other Physicochemical Variables on the Dynamic of Benthic Macroinvertebrates of Küçükçekmece Lagoon Lake (Turkey, İstanbul)

In this study, to determine the trophic level of Küçükçekmece Lagoon Lake, water and sediment samplings were performed at five selected stations seasonally during a year between 2014-2015. The samples analyzed some environmental variables (water temperature, pH, conductivity, DO (dissolved oxygen), TDS (total dissolved solids), salinity. NO3-N, NO2-N, SO4-2, PO4-3, SiO2, chlorophyll-a, TP phosphorus), Secchi disc light permeability) benthic macroinvertebrates examined indicator organisms in sampled material. Bray-Curtis Similarity Index was used observed results similarities sampling stations. According this, station 1 (St. 1) located center lake, St. 5 near sea found be different from other while creeks have much more similar each other. addition, trophy Carlson Trophic State (CTSI) obtained physicochemical (Secchi permeability, total phosphorus, chlorophyll-a) it that lake showed eutrophic character all seasons. result sampling, an average 350 individuals per m2 (44.3 % belonging Polychaeta group; 29.5 Chironomidae 19.7 Oligochaeta 6.5 Bivalvia group) 6 macroinvertebrate taxa (Bivalvia, Polychaeta, Tubificoides benedii (Oligochaeta), sp. (immature Oligochaeta), Limnodrilus hoffmeisteri Chironomus salinarius (Chironomidae) determined. Thus, is presence species supported conditions qualitatively. As determined going on expose increasing pollution load.