Phytoplankton and Bacterial Dynamics Related to the Physicochemical Characteristics of Manzala Lake Water, Egypt

Abstract

Egyptian Journal of Botany http://ejbo.journals.ekb.eg/ 61 M ANZALA Lake, the largest Egyptian northern lake, suffers from continuous deterioration as it receives huge amounts of different wastes. This study evaluated the abiotic and biotic conditions of the lake water (e.g., physicochemical variables, bacterial communities, and phytoplankton structures and their biochemical contents) from 11 sites along the lake in winter and summer 2020. The results revealed that the increase in phytoplankton densities and chlorophyll (a) in winter combined with increased nutrient contents. The highest concentrations of the biochemical contents of phytoplankton and the highest enumerations of bacterial indicators were recorded during summer. The sites close to the inlets of drains recorded a complete depletion of oxygen and a high ammonia content. The highest phytoplankton standing crop was recorded in the middle sector of the lake. Despite the efforts of the Egyptian government to rehabilitate Manzala Lake since 2017, the results showed an increase in pollution levels at various sites and the continued deterioration of the lake's ecological status. These results confirm the importance of increasing the efforts to restore the environmental health status of the lake, primarily by treating wastewater before it is discharged into the lake.

Assessment of the Water Quality in the Damietta Branch of the Nile River, Egypt

“…The highest concentration of silicate in the Damietta branch was found at the El-Kanater El-Khayria station, likely due to the discharge of effluents containing various wastes. Conversely, the lowest concentration was recorded at the El-Serw station, likely due to uptake by diatoms, bacteria, fish, fungi, and algae (Mahmoud et al, 2022).…”

Biomonitoring of radioactive contamination using benthic invertebrate communities in Manzala Lake, Egypt

“…Conversely, the maximum value was 14.7 mg l -1 , recorded at station M1 during the summer. The water salinity ranged from a relatively high 21.9% at station M3 (Boughaz El-Boughdady) to a relatively low 1.25% at station M8 (Mahmoud et al 2020).…”

“…Table 2 The environmental parameters of water samples in Manzala Lake (Source: Mahmoud et al 2020) Freshwater and marine mollusk species were included in the present investigation. It comprised three Bivalvia and fourteen Gastropods and recorded the highest species number and second highest density (17 species, 1866 ind.…”