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A study of taxonomic quality of algae attaching Three concert bridges built on the Tigris River within
city of Baghdad including Al-Jadriyah Bridge in Al-Jadriyah area and the Bab Al-Mu'adam Bridge in
Al-Shalajiya area, while the third site included Al-Muthanna Bridge in north of Baghdad city, for the
period from Autumn 2021 and Winter 2022. The study identified 114 species of 32 Genus in which the
predominance of Bacillariophceae (74 species, 14 Genus) Followed by Cyanophyceae (30species, 12
Genus) and 10 species (6 Genus) of Chlorophyceae. The study showed an increase in species of
Bacillariophceae, Cyanophyceae which has the ability to secretion gelatinous substances that enable it to
stick to solid stand, the number of the larges
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