Field and Laboratory Studies on Nile Phytoplankton in Egypt. II. Phytoplankton

Ahmed, Ahmed M.; Mohammed, A. A.; Heikal, M. M.; Zidan, M. A.

doi:10.1002/iroh.19860710209

Cited by 9 publications

(4 citation statements)

References 15 publications

(1 reference statement)

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“…On the other hand, diatoms occupied the first rank in the order of dominance within the natural algal assemblages of the Nile bank facing the Karnak Temple. This observation is consistent with the findings of many investigators (Nassar 1980, El-Shimi 1984, Ahmed et al 1986) who surveyed the phytoplankton populations of the Nile and its tributaries. The results of the en-richment experiments supported the previous observations where Nitzschia palea was recorded in the Nile water and was not found in the lake water.…”

Section: Discussionsupporting

confidence: 92%

Phytoplankton and benthic communities of a small water body (Sacred Lake, Karnak Temple) Luxor, Egypt

Hamed¹,

Shafik²,

Shaaban³

2003

Acta Botanica Hungarica

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The Karnak Temple is a tourist attraction site in Luxor, Egypt. Sacred Lake lies inside the Karnak Temple, it is an important lake from both historical and touristical point of views. About 4,000 years ago the ancient Egyptians used this lake as a saint place. The priests were washing in the lake four to five times a day. The lake area is about 3,200 m 2 . The lake was shallow before 1985 and the floras of the lake had been monospecific cyanoprokaryote (Microcystis flos-aquae or Spirulina labyrinthiformis). In 1985 Nile water was circulated through the lake by the so-called French project. In 1993, the pumping of Nile water was stopped and the water became stored and not renewed again. The increase in the water level of the lake since 1985 followed by stopping the water circulation in 1993 have a negative impact, making the lake similar to a fishpond. Now, sixteen taxa of cyanobacteria and Chlorophyta were determined in the lake together with dense vegetation of the aquatic plant Potamogeton pectinatus L. during the two expeditions in April and October 1996. The presence of this diversified flora, especially the bad smell resulting from the growth of algae and aquatic plant has adverse effects on tourism. Restoration of the ancient picture of the lake is recommended and some suggestions were emphasised in this study. We would like to call attention for protection of the lake by continuous cleaning. This suggestion will help in restoring the lake to its ancient status.

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Section: Discussionsupporting

confidence: 92%

Phytoplankton and benthic communities of a small water body (Sacred Lake, Karnak Temple) Luxor, Egypt

Hamed¹,

Shafik²,

Shaaban³

2003

Acta Botanica Hungarica

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“…This is in agreement with other studies [25] which recorded a linear relationship between the chl(a) content and cell counts, while other authors pointed out that there were several limitations in using chl(a) as a measure of phytoplankton volume. However, the increase and/or decrease in chl(a) of water did not coincide with a similar trend in the total phytoplankton count.…”

Section: Methodssupporting

confidence: 90%

Influence of nitrogen/phosphorus ratios on the productivity of Nile river phytoplankton

Abou-Waly

Farid

Dawah

2000

International Journal of Environmental Studies

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Mixtures of different concentrations of both nitrogen and phosphorus were used at various N/P ratios to investigate the maximum growth of Nile River Phytoplankton using bioassay studies. A ratio 4:1 N/P gave a high algal mass production and high content of chl(a) of phytoplankton. A high diversity value 1.48 was obtained during the experimental run. Bacillanophyta was the dominant group followed by chlorophyta and cyanophyta in all treatments. The growth rate reached its maximum value (1.69) after 16 days of incubation. Positive correlation was established between phytoplankton and orthophosphate, nitrate, organic nitrogen and dissolved oxygen of the Nile River water.

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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%

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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Field and Laboratory Studies on Nile Phytoplankton in Egypt. II. Phytoplankton

Cited by 9 publications

References 15 publications

Phytoplankton and benthic communities of a small water body (Sacred Lake, Karnak Temple) Luxor, Egypt

Phytoplankton and benthic communities of a small water body (Sacred Lake, Karnak Temple) Luxor, Egypt

Influence of nitrogen/phosphorus ratios on the productivity of Nile river phytoplankton

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

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