Bioassessment of Macrobenthic Fauna of the Cheshmeh Kileh River, Northern Iran

摘要

Chesluneh Kileh River located in southern part of Caspian Sea is of high importance due to a significant and valuable habitat for migration and spawning of valuable fisheries species such as Salmo trutta caspius and Rutilus frisii kutum. The present study aims to explore the Cheshmeh kileh River's water quality using demographic indicators of Macrobenthic invertebrates during 2010-2011 in four stations and during twelve times sampling of surber levels in three replicates. The results shows that the maximum annual mean frequency of Macrobenthic invertebrate orders at stations 1 and 2 are related to Diptera, Ephemeroptera and Trichoptera orders, respectively and Diptera, Ephemeroptera orders and Oligochaeta categories (Haplotaxida, Tubificida, Lumbricida, Lumbericulida orders) at stations 3 and 4. So, station 1 with 9.07 grhas the highest amount of Macrobenthic biomass and station 4 with mean weight of l.llg/m~2 has the lowest amount of Macrobenthic biomass during the entire year. According to theobtained results, changes and stresses existing in the direction of the river, especially residential waste matters has made changes in the composition of Macrobenthic community and the frequency of resistant and filtering groups and the percent of sensitive groups has been relatively reduced.