Structure and Biochemical Analysis of Phytoplankton in the Wadi El-Rayan Lakes, El-Fayoum, Egypt.

Sabae, Soaad A.; Mahmoud, Abeer M.A.

doi:10.21608/eja.2021.68936.1047

Cited by 4 publications

(1 citation statement)

References 5 publications

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“…These results agree with Mahmoud et al (2022) and Newall et al (2015). Generally, the biochemical composition of phytoplankton could be a good predictor of their nutritional content and a good integrator with the surrounding ecosystems where they develop (Sabae & Mahmoud, 2021). Also, the biochemical composition of phytoplankton is affected by the bacterial load, nutrient concentration, physicochemical parameters, and discharged contaminants and drainage water.…”

Section: Biochemical Contents Of Phytoplanktonmentioning

confidence: 99%

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

et al. 2022

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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.

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Section: Biochemical Contents Of Phytoplanktonmentioning

confidence: 99%

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

et al. 2022

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Ecosystem and Commercializing of Fish in a Rich-Minerals, Low-Salinity Closed Lake

Abdelkarim,

Belal,

Flefil

et al. 2023

Water Air Soil Pollut

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Wadi El Natrun is an elongated narrow depression in the Western Desert of Egypt. The depression characterized by many ancient alkaline salt lakes. These lakes are filled with water in winter and dried up in summer. Recently, some lakes become permanently dried, while others become submerged throughout the year as El Bieda Lake. El Bieda Lake has undergone ecological changes due to the prolonged extraction of minerals and the continual discharging of freshwater. This study investigates the recent biotic and abiotic changes of this lake and discusses its fisheries opportunities. The lake’s water is well-oxygenated, rich with different inorganic nutrients, and characterized by a low salinity. Sodium and chloride ion concentrations are lower than the equivalent surface seawater, while magnesium, calcium, potassium, sulfate, and bicarbonate ions are higher. The lake has low plankton species richness with high biomass and high nutritional values. More recently, two cichlid species, Oreochromis aureus and Coptodon zillii, have colonized the lake. Summer characterized by a very low mortality for Oreochromis aureus and a poor representation of Coptodon zillii. However, both species shared the catch the rest of the year. The high biomass and nutritional quality of plankton communities, as well as the dense phytobenthic film, indicate that the lake is currently below its carrying capacity. The well-oxygenated water, high biomass of plankton and phytobenthic diatoms, and the expected changes in salinity suggest that introducing the euryhaline, commercially valuable, and fast-growing Mugil cephalus or Chelon ramada in El Bieda Lake is highly advisable.

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Assessment of pollution and metal toxicity in the bed sediment of El-Rayan Lakes, Fayoum, Egypt

et al. 2023

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Sediments are vital components of aquatic ecosystems, which trap and store various essential elements as well as harmful polluting substances. This is why sediment quality assessment is of great importance in measuring the quality, or pollution, of water bodies. In this study, the levels, ecological risk, and toxicity indices of 17 heavy metals (HMs) were evaluated in the sediments of the two lakes: Upper Wadi El-Rayan Lake (UWRL) and Lower Wadi El-Rayan Lake (LWRL). Both are important wetlands in Egypt used as agricultural drainage water reservoirs for Fayoum province. As revealed by the texture of the sediments, the sand represented the major sediment portion of the UWRL, while the mud was dominant in the LWRL. According to ecological risk assessment, the sediments of the two lakes suffer different degrees of metal pollution, mainly Cd, Pb, and Ni. Based on sediment quality guidelines, toxicity indices indicated different potential toxic effects of the studied HMs on benthic-dwelling organisms, but Ni and Ba had the highest potential biological risk. Results also revealed that the area facing the El-Wadi Drain is the most polluted due to its proximity to the water drainage entrance. However, LWRL is generally more polluted than UWRL. This is related to the shrinkage of water volume and lake area; it causes an increase in the concentration of metals in water, and thus an increase in the sedimentation rate of these metals into the bottom.

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Structure and Biochemical Analysis of Phytoplankton in the Wadi El-Rayan Lakes, El-Fayoum, Egypt.

Cited by 4 publications

References 5 publications

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

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

Ecosystem and Commercializing of Fish in a Rich-Minerals, Low-Salinity Closed Lake

Assessment of pollution and metal toxicity in the bed sediment of El-Rayan Lakes, Fayoum, Egypt

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