Studies on the soil algal flora of the canal bank habitats at Sohag District, Egypt

The soil algal flora of the canal bank habitat at Sohag District, Egypt, together with the edaphic, climatic factors and physicochemical characters of the soil were seasonally studied during the year 1992. The maximum values of electric conductivity, sodium, potassium, calcium, chloride, sulfate, bicarbonate, soluble, silicate and ammonia-nitrogen were recorded in summer. The highest values of magnesium and available phosphate were detected in autumn. The maximum values of algal biomass [100.3 kg/ha] was estimated in winter. This was accompanied by maximum values of organic carbon and nitrate nitrogen. On the other hand, the minimum values of algal biomass [9.1 kg/ha] and organic carbon were detected. Thirty-four species were isolated and identified, 24 Cyanophyta, 8 Chlorophyta, one Xanthophyta and Bacillariophyta. The blue-green algae frequently encountered constituted 70.58% of the total population of all soil samples with predominance of Anabaena, Calothrix, Lyngbya, Nastoc and Phormidium. Green algae were mostly represented by Asterococcus chlorella and Kirchneriella. Both Xanthophyta and Bacillariophyta were represented by one species, Hanzschia and Tribonema, respectively

Seasonal changes in the algal microflora of Bahr-Shebeen Menoufia-Egypt

Monthly variations in physicochemical characteristics of water samples and phytoplankton distribution were followed. The phytoplankton encountered at all sites are included in the divisions of Chlorophyta, Bacillariophyta, Cyanophyta, Euglenophyta, Pyrrophyta and Chrysophyta. The standing crop showed marked seasonal variations in the different localities. Chlorophyta formed the majority of the crop in most samples, while Bacillariophyta ranked second and Cyanophyta third in order of dominance. Physicochemical characters of water showed some regional and seasonal variations which were reflected in gross changes in species composition and standing crop at different locations. The species diversity index ranged between 0.55 to 1.62 in the three localities indicating that this water body is mesotrophic or slightly eutrophic

Eutrophication of Nile water and seasonal periodicity of phytoplankton communities as influenced by cement industrial wastes at Helwan region

The changes in phytoplankton size and species composition in the Nile water facing to Portland Cement Factory [Helwan] were studied during the period October 1987 - September 1988. The standing crop showed distinct seasonal variations. Spring harbored the highest yield, whereas winter and autumn represented the poorest seasons. The dominance of algal groups was arranged as: Bacillariophyta > Cyanophyta > Chlorophyta > Euglenophyta. The physicochemical characteristics of water also analyzed during this period

Succession, biomass levels of phytoplankton in the Nile Water near the starch and glucose factory at Giza [Egypt]

The changes in phytoplankton size and species composition in the Nile water near the Egyptian Starch and Glucose Factory were studied from October 1987 to September 1988. The standing crop showed distinct seasonal variations. The dominance of algal groups was in the order : Chlorophyta > Bacillariophyta > Cyanophyta > Euglenophyta. The number of species found in the polluted section was low but always higher than in the unpolluted section