{'fraction_non_alphanumeric': 0.013531799729364006, 'fraction_numerical': 0.010148849797023005, 'mean_word_length': 5.136929460580913, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Ecological Dynamics of the Toxic Bloom-Forming Cyanobacterium Microcystis aeruginosa with Its Cyanophage in Surface Freshwater of the River Nile

The present investigation aims to study the dynamics of the harmful bloom-forming cyanobacterium Microcystis aeruginosa with its Cyanophage Ma-LMM01 in the River Nile ecosystem. Two freshwater samples in the Damietta branch of the River Nile represented the inlet and the outlet of a drinking water treatment plant were assessed according to a number of physicochemical and biological parameters. The total dissolved hepatotoxin microcystins in the raw and potable water were tested using the ELISA technique. Quantitative analysis of the 16S rRNA, mcyA , and g91 genes was done in order to estimate microcystin-producing organisms and the Ma-LMM01 cyanophage. The results showed a high growth reached bloom-forming of Microcystis aeruginosa in the raw water while the treated one showed a vanishing in the number of Microcystis aeruginosa. A high concentration of microcystins was detected during the study period with the highest concentration of 4.4 µg. L -1 was recorded in the raw water sample during July. The sequencing result of the amplification products of the g91 gene proves the presence of cyanophages but generally in a lysogenic state. The results obtained from this study revealed the presence of cyanophage Ma-LMM01 concomitantly with the presence of Microcystis aeruginosa bloom without having a high lytic effect.