Ecological study of some dominant species Chironominae (Chironomidae :Diptera ) as bio-indicator for water pollution in Tigris river Al Kut city / Iraq.

Abstract

Ecological study was conducted in Tigris River Al Kut city during the period (November 2013- April 2014) to see the volume of pollutants that arise into the river Within months study depending on the abundance and diversity of Chironomid species subfamily Chironominae(Chironomidae: Diptera). Ten species of Chironominae were identified Polypedilum aviceps was the most dominant made up 48.59%, Polypedilum tritum 33.19% , Einfeldia pagana 3.95% , Chironomus riparius 2.39% , Chironomus plumosus 2.39% , Chironomus piger 2.08%, Polypedilum brasenia 1.04% , Einfeldia natchitocheae 1.04% , Cryptochironomus sp. 0.73% and Paralauterborniella sp. 0.73% .Result of this study showed significant correlations between the species and several environmental parameters. Polypedilum tritum , E. natchitocheae, Paralauterborniella sp. this group showed significantly positive correlation ( p< 0.05) with PH, temperature and turbidity and showed significantly negative correlation( p<0.05 and 0.01) with water temperature and TDS.Also environmental parameters (DO, BOD) and the ten species of Chironomid showed significantly positive correlation (p< 0.05, 0.01) among stations study (S1,S2,S3) .