Effect of AL-Tharthar Canal on the Zooplankton Composition and Diversity in the Tigris River

This study is considered the first in this sector of Tigris River after 2003, to evaluate effect Tharthar Canal on composition and diversity zooplankton River. Six sampling sites were selected; two canal four along River, one before confluence as a control site others downstream confluence. One hundred thirty-four taxa recorded study, 129 ,76 well 96 shared between river canal. The high value density increased from 307989 Ind./m3 1 upstream 371427 4 immediately Also, mean values richness index, evenness index decreased 7.46, 0.69 2.40 bit/Ind. 6.46, 0.61 2.08 confluence, respectively. Furthermore, highest similarity percentage was 6 reached 84.28% while, lowest 2 65.97%. for constancy 24 6.