Isolation and identification of some types of algae from the Tigris River as it passes through Tikrit city and their relationship with some physicochemical variables.

Abstract

The current study was conducted in the period from July 2022 until June 2023 to test the seasonal biological, chemical and physical changes of the Tigris River water and the effect of its passage through the city of Tikrit on changing these properties. The results showed that electrical conductivity had differences in temporal and spatial values, with the lowest value in the summer and the highest value in the winter. The turbidity had significant differences in the temporal and spatial values at the study stations, the lowest value in the winter and the highest value in autumn. The results also indicate that there are no significant differences in the temporal and spatial pH values at the probability level of p ≤ 0.05. The lowest value was in the winter and the highest value in the summer. The results also showed significant differences in the temporal and spatial values of total soluble solids. The value was lowest in the autumn and the highest value in the winter. Dissolved oxygen also had differences in spatial values, with the lowest value in the summer and the highest value in the winter. The results also recorded that the total basicity had differences in spatial values, where the highest value was in the winter and the lowest value in autumn. Likewise, the results for chloride ion recorded non-significant differences in the temporal and spatial values, where it reached the highest value in the winter and the lowest value in the summer. The results also showed that sulfate had differences in temporal values, reaching the highest value in the winter and the lowest value in summer.It was also observed that some types of algae were dominant in the study stations, such as: Oedogonium Spp and Navcula Spp. and Cladophora Spp. and Netrium sp. and Ulothrix sp.