Field and Laboratory Studies on Nile Phytoplankton in Egypt III. Some Physical and Chemical Characteristics of Aswan High Dam Lake (Lake Nasser)

Ahmed, Ahmed M.; Mohammed, A. A.; Springuel,; El-Otify, Ahmed Mohamed

doi:10.1002/iroh.19890740309

Cited by 2 publications

(3 citation statements)

References 21 publications

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“…Lake Nasser is a monomictic subtropical lake with a single period of turnover (Entz 1997). The onset of thermal stratification is recorded in the late spring months (Ahmed et al 1989). Pronounced thermal stratification appears in summer seasons (Nessim 1972, Elewa 1976) and in the early autumn months.…”

Section: Discussionmentioning

confidence: 99%

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Analyses of physico-chemical characteristics and phytoplankton communities of Lake Nasser during the last two decades

El-Otify¹,

Shafik²,

Szőke³

2003

Acta Botanica Hungarica

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Lake Nasser is one of the largest man-made lakes in the world. The creation of Lake Nasser, due to the impoundment of the River Nile in Southern Egypt, was accompanied by alterations in the environmental conditions that consequently affect the biota. Such alterations lead to corresponding changes in the diversity, abundance and distribution of the phytoplankton community. Therefore, the phytoplankton populations were followed and investigated in Lake Nasser. The phytoplankton community structure revealed a floristical diversity and is composed of various planktonic algal taxa appertaining to the divisions: Chlorophyta, Bacillariophyta (diatoms), Cyanophyta (cyanobacteria), Dinophyta (Dinoflagellates) and Euglenophyta. Chlorophyta contribute more taxa to the phytoplankton than any other groups. However, diatoms and cyanobacteria are numerically the main components and alternate in dominance of the community. Dinoflagellates persist as frequent forms and the euglenoid algae are very scarcely represented. Remarkable spatial (horizontal and vertical) as well as temporal (seasonal) variations are recorded in the distribution of phytoplankton. Pronounced variations in the vertical distribution of the phytoplankton standing crop appear during the periods of thermal stratification (late spring, summer and early autumn). However, diatoms and cyanobacteria remain the most influential groups also in the vertical distribution of the phytoplankton. Water blooms are occasionally observed in limited areas of the southern region of Lake Nasser mainly due to the florishment of the cyanobacterium Microcystis aeruginosa.

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Section: Discussionmentioning

confidence: 99%

“…The water transparency of Lake Nasser is affected by different factors (Ahmed et al 1989) including the floodwater loaded with silt, the development of phytoplankton and wind action. Thus, wide range of variations of water transparency is recorded depending mainly on season and region (Zaghloul 1985).…”

Section: Discussionmentioning

confidence: 99%

Analyses of physico-chemical characteristics and phytoplankton communities of Lake Nasser during the last two decades

El-Otify¹,

Shafik²,

Szőke³

2003

Acta Botanica Hungarica

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“…Finally, some correlations must he estahlished between the rcsults presented in parts 111 (AHMED et al, 1989) and I V of this series concerning AHDL. The developnient of phytoplankton in relation t o the surrounding conditions could be follon ed.…”

Section: Discussionmentioning

confidence: 97%

Field and Laboratory Studies on Nile Phytoplankton in Egypt IV. Phytoplankton of Aswan High Dam Lake (Lake Nasser)

Mohammed

Ahmed

El-Otify

1989

Intl Review of Hydrobiology

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Seasonal, local and monthly vertical variations in chlorophyll a concentration and in qualitative and quantitative counts in Aswan High Dam Lake (AHDL) phytoplankton were followed from March 1982 to February 1984. The chlorophyll a values correlated more or less with the total phytoplankton counts. Total algal counts exhibited considerable local variations in the different seasons and tended t o decrease in the most southern part of AHDL, especially during the flood period. The temporal course of algal development showed a n almost inverse trend to that of dissolved nitrate-nitrogen. The possibility of nitrogen limitation of algal growth was verified.Diatoms and blue-green algae alternated in the dominance of the phytoplankton community. The genera Cydotella and Anabaenopsis respectively were the most predominant genera among the diatoms and blue-greens and consequently in the phytoplankton community.

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Field and Laboratory Studies on Nile Phytoplankton in Egypt III. Some Physical and Chemical Characteristics of Aswan High Dam Lake (Lake Nasser)

Cited by 2 publications

References 21 publications

Analyses of physico-chemical characteristics and phytoplankton communities of Lake Nasser during the last two decades

Analyses of physico-chemical characteristics and phytoplankton communities of Lake Nasser during the last two decades

Field and Laboratory Studies on Nile Phytoplankton in Egypt IV. Phytoplankton of Aswan High Dam Lake (Lake Nasser)

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