Study of the relative abundance for zooplankton community in the Euphrates River within the city of Samawah/ Iraq

This study, the first of its kind, was conducted on the Euphrates River in the city of Samawah. To identify and diagnose the environment of the diversity of zooplankton in the Euphrates River. This study was conducted from December of the year 2021 until February 2022. Three sites were chosen: The first site (enters The Euphrates River in the city of Samawah) The second site (city centre) and the third site (the exit of the river from the city) are 11 km away from each other. The study included a diagnosis of zooplankton, the study of total density and evidence of relative abundance. The study identified 50 zooplankton taxonomic units, 31 units belonged to Rotifera, 10 units belonged to Cladcera, and 9 units belonged to Copepoda. The Rotifera predominate in the Euphrates river, both quantitatively and qualitatively. The total density of zooplankton recorded values ​​ranging from 260 - 3110 ind/m3 recorded for Rotifera, the Rotifera recorded the highest density, which ranged between 220 - 2990 ind / m3, and the Cladcera recorded the lowest density in this study, which ranged between no-appearance - 160 ind / m 3 The density of the Copepoda  ranged between 10 - 370 ind /m3

Assessment of the trophic status at Al-Sabil River using the trophic indices in Al-Shinafiya district, Southern Iraq

The current study was conducted to determine the quality of the water of Al- Sabil River in Al-Shinafiya district, Province of Al- Diwaniyah, for the period from September 2018 to August 2019. Three sites were selected along the river, a quantitative and qualitative study of the diatoms as well as its indices to assess the quality of water in the river, such as trophic diatom Index (TDI), Trophic State Index (TSI), Diatomic Index (DI), and General Diatoms Index (GDI). The current study was diagnosed about 136 species of diatoms at three sites, where the central diatoms was 12 species while the pannals diatoms reached 124 species, and recorded total numbers of diatoms (35453.8, 29447.2 and 36504.76) cell*310/L, and rates (2954.48, 2453.93 and 3042.06) cells*310/L for the three locations respectively, as shown by the results of the trophic diatom Index(TDI) values ranged from (23.33 to 55.54) and the values of Trophic State Index (TSI) ranged from (0.07 to 0.81) and the Diatomic Index (DI) values ranged from (9.08 to 16.20) and the values of the General Diatoms Index (GDI) ranged from (2.23 to 3.17). It was noted that the water quality was Oligotrophic to Mesotrophic based on TDI and TSI, while its moderate to Good based on DI and GDI, and concluded that the higher the evidence values indicated that the water quality tended to be good, free or low pollution, suitable for living well, and that water was few nutrients, while its low values indicated the deterioration of the water quality in the river.Validerad;2020;Nivå 1;2020-11-18 (johcin)</p