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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)
Author(s) -
Ahmed Ahmed M.,
Mohammed Ahmed A.,
ElOtify Ahmed M.
Publication year - 1989
Publication title -
internationale revue der gesamten hydrobiologie und hydrographie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.524
H-Index - 52
eISSN - 1522-2632
pISSN - 0020-9309
DOI - 10.1002/iroh.19890740309
Subject(s) - phytoplankton , environmental science , thermal stratification , hydrology (agriculture) , seasonality , nitrate , limiting , spring (device) , silt , oceanography , geology , nutrient , ecology , biology , thermocline , geomorphology , mechanical engineering , geotechnical engineering , engineering
Seasonal, local and monthly vertical variations in physical and chemical characteristics of Aswan High Dam Lake (AHDL) were followed during the period from March 1982 to February 1984. The results show that there were distinct seasonal thermal variations. Similarly, thermal stratification was evident from late spring through early autumn. Oxygen content appeared to vary with the changes in pH value. Water transparency in the southern part was greatly reduced by the incoming silt laden flood especially in summer months. Consequently, nitrate‐nitrogen and total residue increased considerably in this part during summer. The recorded minimum N‐concentration (2.35μg l −1 ) was certainly limiting the growth of phytoplankton. Suspended and organic matter exhibited somewhat irregular variations at least during the period of this study.