Comprehensive Insight into Lake Nasser Environment: Water Quality and Biotic Communities—A Case Study before Operating the Renaissance Dam
| Autor: | Usama M. Tahoun, Eman I. Abdel-Aal, Soaad A. Sabae, Marian G. Nassif, Seliem M. El-Sayed, Amany M. Haroon, Walid Aly, Abd-Ellatif M. Hussian, Mohamed E. Goher, Mohamed A. Fetouh, Agnieszka Napiórkowska-Krzebietke, Mahmoud H. Hegab |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Biochemical oxygen demand
zooplankton quality assessment Geography Planning and Development Aquatic Science Biochemistry Zooplankton Phytoplankton parasitic diseases macrophytes and epiphytes bacteria TD201-500 Water Science and Technology Total suspended solids fish Water supply for domestic and industrial purposes Aquatic ecosystem fungi physicochemical parameters Hydraulic engineering Total dissolved solids Macrophyte Environmental chemistry phytoplankton Environmental science Water quality TC1-978 |
| Zdroj: | Water Volume 13 Issue 16 Water, Vol 13, Iss 2195, p 2195 (2021) |
| ISSN: | 2073-4441 |
| DOI: | 10.3390/w13162195 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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