期刊名称：Beni-Suef University Journal of Basic and Applied Sciences
印刷版ISSN：2314-8535
电子版ISSN：2314-8543
出版年度：2018
卷号：7
期号：3
页码：344-352
DOI：10.1016/j.bjbas.2018.03.002
语种：English
出版社：Elsevier
摘要：AbstractIn this study, the phytoplankton biomass and species composition in El-Quanater El-Khayria (River Nile, Egypt) was analyzed at four sampling sites on a program of a seasonally sampling and supported by measurements of different water variables as well as biomass production of most common aquatic macrophytes. The major species of aquatic macrophytes were two submerged species (Ceratophyllum demersumandCeratophyllum submersum), two emergent (Polygonum tomentosumandspontaneum), and one free floating aquatic macrophyte (Eichhornia crassipes). Considerable seasonal variations in water quality as well as macrophytes biomass were found in the studied areas, which result in a variation of phytoplankton flora. A total of 235 phytoplankton species belonging to 7 classes was recorded, with higher numbers in autumn and winter compared to spring and summer. The maximum number of phytoplankton (7238 × 104 L−1 cells) was recorded in winter, however, the lowest one (96 × 104 L−1 cells) recorded in spring. Chlorophyceae was the dominant group, forming 56.96% of the total phytoplankton biomass followed by Bacillariophyceae (34.82%), Cyanophyceae (7.99%), Cryptophyceae (0.10%), Dinophyceae (0.096%), Chrysophyceae (0.03%) and Euglenophyceae (0.02%). Chlorophyllavalues ranged from 9.77 µg L−1to 69.81 µg L−1, with a considerable seasonal and spatial variation. All phytoplankton classes as well as, chlorophyllawas negatively correlated with all aquatic macrophytes species except forC.submersumwhich correlated positively with chlorophyllaand Cyanophyceae. In addition, it was positively correlated with pH, conductivity and dissolved oxygen.
关键词：Aquatic macrophytes;Ecology;Phytoplankton;Allelopathy;Water quality;River Nile
