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Field and Laboratory Studies on Nile Phytoplankton in Egypt IV. Phytoplankton of Aswan High Dam Lake (Lake Nasser)
Author(s) -
Mohammed Ahmed A.,
Ahmed Ahmed M.,
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.19890740507
Subject(s) - phytoplankton , dominance (genetics) , chlorophyll a , diatom , nitrate , algae , environmental science , oceanography , ecology , hydrology (agriculture) , biology , nutrient , botany , geology , biochemistry , gene , geotechnical engineering
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 to decrease in the most southern part of AHDL, especially during the flood period. The temporal course of algal development showed an 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 Cyclotella and Anabaenopsis respectively were the most predominant genera among the diatoms and blue‐greens and consequently in the phytoplankton community.