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Article

Comprehensive Insight into Lake Nasser Environment: Water Quality and Biotic Communities—A Case Study before Operating the Renaissance Dam

1
National Institute of Oceanography and Fisheries (NIOF), Cairo 11694, Egypt
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Department of Ichthyology, Hydrobiology and Aquatic Ecology, S. Sakowicz Inland Fisheries Institute, Oczapowskiego 10, 10-719 Olsztyn, Poland
3
Faculty of Education, Matrouh University, Marsa Matrouh 51511, Egypt
*
Author to whom correspondence should be addressed.
Academic Editor: Shiming Ding
Water 2021, 13(16), 2195; https://doi.org/10.3390/w13162195
Received: 3 July 2021 / Revised: 6 August 2021 / Accepted: 8 August 2021 / Published: 11 August 2021
(This article belongs to the Special Issue Phytoplankton and Phytobenthos: From Freshwater to Marine Ecosystems)
This study focused on the monitoring and assessment of aquatic ecosystem functioning based on the abiotic and biotic features of Lake Nasser in the post-flood and pre-flood periods as the last ones before water storing behind the Grand Ethiopian Renaissance Dam. The physicochemical parameters, distribution and structure of biotic communities, including bacteria, phytoplankton, zooplankton, macrophytes, epiphytes and fish were analyzed at 15 sites. The values of most parameters (primarily temperature, total suspended solids, pH, orthophosphates, carbonates, sulphates and some cations) were higher in the pre-flood period, whereas higher values of conductivity, total dissolved solids, total solids, nitrites, nitrates, chemical oxygen demand, bicarbonates and chlorophyll a were recorded in the post-flood period. Cyanobacteria-dominated phytoplankton and total coliform bacteria were more abundant in the pre-flood period, and especially at sites 10–15, whereas higher abundances of zooplankton were recorded in the post-flood period. All these changes in parameters were significantly differentiated, and only the concentrations of dissolved oxygen, biochemical oxygen demand, ammonium and silicates were at similar level in both periods. The study also indicated that environmental factors had affected the macrophyte distribution and the adaptation of the invasive species Myriophyllum spicatum to thrive under different environmental factors in the lake. Besides, macrophytes provided the habitat to other aquatic organisms, especially epiphytes, and also helped maintaining the good water quality, nutrient cycling and stabilizing rivers’ and lakes’ banks. Generally, these conditions were rather favorable for biological processes and fish production. View Full-Text
Keywords: phytoplankton; zooplankton; macrophytes and epiphytes; bacteria; fish; physicochemical parameters; quality assessment phytoplankton; zooplankton; macrophytes and epiphytes; bacteria; fish; physicochemical parameters; quality assessment
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MDPI and ACS Style

Goher, M.E.; Napiórkowska-Krzebietke, A.; Aly, W.; El-Sayed, S.M.; Tahoun, U.M.; Fetouh, M.A.; Hegab, M.H.; Haroon, A.M.; Sabae, S.A.; Abdel-Aal, E.I.; Nassif, M.G.; Hussian, A.E.M. Comprehensive Insight into Lake Nasser Environment: Water Quality and Biotic Communities—A Case Study before Operating the Renaissance Dam. Water 2021, 13, 2195. https://doi.org/10.3390/w13162195

AMA Style

Goher ME, Napiórkowska-Krzebietke A, Aly W, El-Sayed SM, Tahoun UM, Fetouh MA, Hegab MH, Haroon AM, Sabae SA, Abdel-Aal EI, Nassif MG, Hussian AEM. Comprehensive Insight into Lake Nasser Environment: Water Quality and Biotic Communities—A Case Study before Operating the Renaissance Dam. Water. 2021; 13(16):2195. https://doi.org/10.3390/w13162195

Chicago/Turabian Style

Goher, Mohamed E., Agnieszka Napiórkowska-Krzebietke, Walid Aly, Seliem M. El-Sayed, Usama M. Tahoun, Mohamed A. Fetouh, Mahmoud H. Hegab, Amany M. Haroon, Soaad A. Sabae, Eman I. Abdel-Aal, Marian G. Nassif, and Abd E.M. Hussian 2021. "Comprehensive Insight into Lake Nasser Environment: Water Quality and Biotic Communities—A Case Study before Operating the Renaissance Dam" Water 13, no. 16: 2195. https://doi.org/10.3390/w13162195

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