Diversity of Cladocera of the Shatt Al-Arab River, Southern Iraq

الملخص EN

Samples of zooplankton were collected monthly from three stations in the Shatt Al-Arab region (Al-Hartha, Garmat Ali and Al-Ashaar) for the period from June 1996 to May 1997 using a plankton net with a mesh-size of 120 μm.

Twenty species of Cladocera belonging to 14 genera were recorded in the study area.

The total number of Cladocera ranged between 0.3 ind.

/ m3 during October 1996 and 7207 ind.

/ m3 during April 1997.

The highest values of Shannon Weaver diversity index and Richness index were recorded at station 3 during December and June (1.8 and 7.62, respectively), and the lowest values were (0) and 0.23, reported in July at station 3 and in March at station 2.

The highest value of Evenness (1.0) was recorded at station 3, during October and the lowest (0.01) was recorded at station 2 during April.

The Jaccard index indicates that the highest similarity was between stations 1 and 3 (34.48) and the lowest was between stations 2 and 3 (30.49).