Author/Authors :
Abdullah, S. A. H. Ministry of Sciences and Technology, Iraq , Radhi, A. G. Ministry of Sciences and Technology, Iraq , AbdulJabbar,, R.A. University of Tikrit - College of Science, Iraq , AL - Lami, A. A. Z, Ministry of Sciences and Technology, Iraq , Nhashat, M.R. Ministry of Sciences and Technology, Iraq
Abstract :
Benthic invertebrates diversity and some physical and chemical characteristics in Lower Zab tributary and Tigris River were studied. Monthly samples were collected lrom November 2001 to October 2002. The results of the present study showed the turbidity in Tigris river before the conflucncc to be higher (34.4 NTU) compared to the other stations. Mean salinity was greater in Lower Zab tributary (0.33 %) compared to that in the river. Lower Zab tributary and Tigris River were good in Oxygen content, and a high dissolved oxygen value was recorded (7.9 mg/L) in Lower Zab tributary. 31 benthic invertebrate species were identified, 14 of which were arthropods, 8 species from both of the Oligochacta and Mollusca .One single species was identified from heNemaihelminthes. Species diversity varied from 1.9 in Lower Zab tributary to 2.7 in Tigris River after the confluence. The highest species density was recorded in Tigris River after the confluence was 359.1 ind/m2 while the lowest species density was 12.74 ind/m in Lower Zab tributary.
