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Long-term abiotic changes of two technogenic lakes in the Wadi El-Rayan depression (Egypt)

Moham Goher, Nickolai Shadrin, Seliem El Sayed, Mahmoud Hegab, Nehad Khalifa, Soaad Sabae, Yaseen Abd El-Tawab, Abdellatif Hussian, Mikhail Grigoriev, Elena Anufriieva

Abstract

Context. The 38-year-long-term changes of six abiotic characteristics in two artificial desert lakes. Aims. To investigate the long-term dynamics of salinity, water temperature, transparency, oxygen content, total phosphorus, and nitrogen. Methods. From 1984 to 2022, seasonal data were collected on 10 sites in two connected lakes, and then statistical analysis was applied to them. Key results. All studied parameters changed in both lakes. Salinity changed differently in lakes, as well as some other characteristics. This was due to the individual peculiarities of lakes; one is flowing, and another is terminal. In both lakes, the water temperature increased, which was more pronounced in the terminal lake. Some quasiperiodic changes were also noted. Conclusions. This study presents the largely neglected effect of interactions between regional climatic changes and individual lake peculiarities as well as between directed trends and natural cycles. Implications. This information is valuable for the management of water bodies, resource use, and the development of sustainable polyaquaculture in them.

MF25050  Accepted 25 August 2025

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