Effect of Nile River water quality on algal distribution at Cairo, Egypt

Shehata, Salwa A.; Bader, Sabah A.

doi:10.1016/0160-4120(85)90230-2

Cited by 10 publications

(7 citation statements)

References 8 publications

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“…The relatively high proportion of diatoms appeared during autumn -spring period when water temperature conditions were most likely constituted a good environment for their growth and ability to compete for nutrients (Lung'Ayia et al, 2000). The dominance of centric diatoms for most part of the year was also recorded in different other parts of the Nile in Egypt (El-Ayouty & Ibrahim, 1980;Shehata & Bader, 1985;Ahmed et al, 1986;Mohammed et al, 1986;Shabana et al, 1993).…”

Section: Phytoplanktonmentioning

confidence: 97%

“…the ability of the pollutants to cause considerable hazards to animal and human health. The Nile potamoplankton was found to be sensitive to water quality (Shehata & Bader, 1985) and disturbance caused mainly by input of industrial wastes. Thus, it is of great importance to understand the Nile potamoplankton dynamics and the factors influencing their development and distribution.…”

Section: Introductionmentioning

confidence: 99%

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Water quality and potamoplankton evaluation of the Nile River in Upper Egypt

El-Otify

Iskaros

2015

Acta Limnol. Bras.

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Aim: The composition, abundance, community structure of potamoplankton and major physical and chemical variables of the Nile water in Upper Egypt were investigated to assess its status in different seasons during 2007.MethodsWater samples were collected seasonally during 2007 from six investigated sites from variable depths at levels of 0, 2.5 and 5 m. The area of this investigation is defined as the southern 120 Km of the main stream of the Nile in Upper Egypt (24° 04’ – 25° 00’ latitudes and 32° 51’ – 32° 54’ longitudes), downstream of Aswan Old Dam.ResultsAltogether, 121 potamoplankton species, of which 85 related to phytoplankton and 36 appertaining to zooplankton were recorded. Most numerous phytoplankton were Chlorophyceae (42 species) followed by Bacillariophyceae (30 species). Cyanobacteria and Dinophyceae were less numerous with only 11 and 2 species, respectively. Zooplankton species were mainly belonging to three systematic groups namely; Rotifera (24 species), Copepoda (3 species) and Cladocera (9 species). Besides, other rare zooplankton including Platyhelminthes, Nemata and Ciliophora were sparsely encountered. The main hydrological conditions characterizing the investigated area include water level fluctuations (˂82 - ˃85 m above sea level), relatively high current velocity (0.8 - 1.3 m sec–1) and disposal of wastewater. Plankton populations were variably but rather weakly dependent on the major nutrients due to their excessive availability in accessible form for uptake by the producers. For phytoplankton, the community structure was categorized in relation to temperature, pH, SO42– and Mg2+. For zooplankton, the community structure was categorized in relation to conductivity as well as Mg2+. Sampling intervals were inadequate to demonstrate the existing successional pattern of the Nile potamoplankton community. Alterations in the phytoplankton community structure accompanied changes in water temperature represented by the alternate dominance between diatoms and cyanobacteria, while zooplankton community was always dominated by rotifers. Phytoplankton populations were numerically more abundant in autumn and zooplankton peaked in spring.ConclusionsWastewater disposal restricted the abundance of the Nile zooplankton assemblages mainly due to the numerical decline of Rotifera and Cladocera. Otherwise, wastewater did not exert major limits for phytoplankton. The data obtained in this investigation will be crucial to understand potamoplankton regulation and contribute to the knowledge regarding the Limnology of the Nile basin.

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Section: Phytoplanktonmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Water quality and potamoplankton evaluation of the Nile River in Upper Egypt

El-Otify

Iskaros

2015

Acta Limnol. Bras.

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“…Previous studies indicate that Chl or other measures of mean sestonic algal abundance may indeed bear a positive relationship with TP or other measures of average P concentration in some streams (Nusch 1978;Jones et al 1984;Shehata and Bader 1985;Soballe and Kimmel 1987;LaPerriere et al 1989). In P-rich streams, however, average abundance of sestonic algae may not be correlated with average P or N concentration (Kilkus et al 1975;Baker and Kromer-Baker 1979;Straskraba 1985;Bennet et al 1986).…”

Section: Introductionmentioning

confidence: 98%

Phosphorus chlorophyll relationship in temperate streams and its variation with stream catchment area

Nieuwenhuyse¹,

Jones²

1996

Can. J. Fish. Aquat. Sci.

125

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Regression analysis of a data set compiled from the literature (n = 292) showed that summer mean chlorophyll concentration (Chl) among temperate streams bore a strong (R 2 = 0.67) curvilinear relationship with summer mean total phosphorus concentration (TP). The predicted slope of the TP-Chl relationship (Chl:TP) ranged between 0.22 at TP = 50 mg•m-3 and 0.08 at TP = 1030 mg•m-3 , the highest value of TP in our data set. A bivariate model indicated that stream catchment area had a significant effect on Chl at all levels of TP and predicted a 2.3-fold increase in Chl:TP as the stream catchment area increased from 100 to 100 000 km 2. We suggest that TP may provide a reliable basis for predicting Chl in small and large temperate streams worldwide. Résumé : Le calcul de régression d'une série de données tirées de la littérature (n = 292) a montré que la concentration estivale moyenne de chlorophylle (Chl) dans les cours d'eau tempérés présentait une forte (R 2 = 0,67) relation curviligne avec la concentration estivale moyenne du phosphore total (PT). La pente prévue de la relation PT-Chl (Chl:PT) allait de 0,22 pour PT = 50 mg•m-3 à 0,08 pour PT = 1030 mg•m-3 , valeur la plus élevée de PT dans notre série de données. Un modèle à deux variables a indiqué que la superficie du bassin versant du cours d'eau avait un effet significatif sur Chl à toutes les concentrations de PT, et a prédit une augmentation d'un ordre de 2,3 du rapport Chl:PT si la superficie du bassin versant du cours augmentait de 100 à 100 000 km 2. Nous pensons que le phosphore total peut constituer une base fiable pour prédire la concentration de chlorophylle dans les cours d'eau petits et grands des régions tempérées du monde entier. [Traduit par la Rédaction]

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“…For fungus, inocula were prepared according to Shehata et al. [ 48 ], by counting conidia harvested from ∼7-day-old potato dextrose agar cultures in a hemocytometer, followed by adjustment to the appropriate final density. Results were read after 48 h incubations for Candida albicans species.…”

Section: Methodsmentioning

confidence: 99%

“…Blank discs were used as negative controls to ensure that the residual solvents (leftover discs even after air-drying) and the filter paper were not active themselves. For fungus, inocula were prepared according to Shehata et al [48], by counting conidia harvested from ~7-day-old potato dextrose agar cultures in a hemocytometer, followed by adjustment to the appropriate final density. Results were read after 48 h incubations for Candida albicans species.…”

Section: Antimicrobial Testmentioning

confidence: 99%