Survey Effects of Agricultural Runoff on Water Quality with Biotic Indices

Case Study: Keselian River- North of Iran

Abstract

Biological and ecological study of water resources is the most fundamental issue in scientific researches and studies of ecosystems. Agricultural water that includes organic substances affects the quality of river water, and studying the biological community of the river is one of the ways to study the degree of this effect. The structure of macro invertebrate was studied from April to August of 2009 in two stations before and after rice-farmed fields. Results showed that sensitive groups decreased and biological indices include EPT, Hisenhoff and Shanoon faced fluctuation as well.