@article { author = {Elrefaey, Ahmed and El-Gamal, Ahmed and El-Belely, Ehab}, title = {SEASONAL DYNAMICS OF PHYTOPLANKTONIC GROUPS IN DAMIETTA BRANCH, RIVER NILE, EGYPT}, journal = {Egyptian Journal of Phycology}, volume = {18}, number = {1}, pages = {1-20}, year = {2017}, publisher = {The Egyptian Phycological Society}, issn = {1110-8649}, eissn = {2735-3826}, doi = {10.21608/egyjs.2017.115985}, abstract = {The distributions of major phytoplankton groups were quantified to estimate the relative contribution of different groups to spatiotemporal dynamics in the northern part of Damietta branch, River Nile, Egypt, in response to a complex of physical and chemical conditions. The study was based on seasonal sampling over one year (summer 2015 to spring 2016) conducted at 6 freshwater and 6 marine sites. Limnological parameters, including electrical conductivity, alkalinity, orthophosphate, reactive silicate, nitrite, nitrate and ammonium, were simultaneously measured to determine the possible factors affecting the phytoplankton composition. Individuals within each phytoplankton groups were expressed as count (×105) per liter. Distinct variations in EC were detected between fresh and estuary habitats, however, other parameters shown spatiotemporal fluctuations. The phytoplankton communities were dominated by five common groups including Bacillariophyta, dominant in both habitats, Chlorophyta and Cyanophyta dominant in freshwater, Pyrrophyta and Euglenophyta dominant in estuary, different abundance contributions were detected between groups depending on seasons and sites. Thus, in River Nile, a complex of physical, chemical and biological factors that affected by natural and anthropogenic activities is responsible for the ecological determinants of the phytoplankton population.}, keywords = {freshwater,Estuaries,phytoplankton,Spatiotemporal,anthropogenic,River Nile}, url = {https://egyjs.journals.ekb.eg/article_115985.html}, eprint = {https://egyjs.journals.ekb.eg/article_115985_288cc86e8fc42078a54bb2d50e1dbcca.pdf} } @article { author = {Mohammed, Amany and Ahmed, Entesar and Saeed, Samir and Dawah, Aida and Salah El Din, Rawheya}, title = {A STUDY ON PHYTOPLANKTON DISTRIBUTION, ABUNDANCE AND COMMUNITY STRUCTURE IN FISH PONDS OF AL- ABBASSA FISH FARM IN RELATION TO PHYSICO-CHEMICAL PROPERTIES OF WATER}, journal = {Egyptian Journal of Phycology}, volume = {18}, number = {1}, pages = {21-44}, year = {2017}, publisher = {The Egyptian Phycological Society}, issn = {1110-8649}, eissn = {2735-3826}, doi = {10.21608/egyjs.2017.115986}, abstract = {This study aims to investigate the phytoplankton dynamics (distribution, composition) and their relation to water quality parameter in Ismailia canal and Abbassa fish farm (inlet, outlet and the fish ponds).The study was carried out from April, 2014 to May, 2015. Physical, chemical parameters and phytoplankton estimation were measured in situ and laboratory. The results showed that, the physico- chemical parameters of water were significantly varied among different seasons and the studied sites. Phytoplankton communities are represented by eight phyla namely; Chlorophyta, Cyanophyta, Euglenophyta, Bacillariophyta, Chrysophyta, Dinophyta, Cryptophyta and Xanthophyta. Their major number (22724 Org./ml) was detected at the fishponds (site C), while their minor number (9374 Org./ml) was detected at the main feeder (MF), (site A). Chlorophyceae was the predominant class at all studied sites except at (MF) where; Bacillariophyceae occupied the first predominant position. Results demonstrated that occurrence of 247 taxa of phytoplankton at (MF), 273 taxa at (inlet), 304 taxa at fishponds and 292 taxa at outlet. Also, Shannon and Weaver diversity index (H-) was studied and the results showed that the mean range of the phytoplankton diversity index (H-) was low (< 2.0) at all the studied sites and this is indication of moderate pollution. It is concluded that, both seasonal variations and physico-chemical parameters of water have great impact on phytoplankton dynamics and its biological diversity.}, keywords = {Chlorophyll "a",diversity indices,fishponds,phytoplankton dynamics,water quality,water supply}, url = {https://egyjs.journals.ekb.eg/article_115986.html}, eprint = {https://egyjs.journals.ekb.eg/article_115986_0728fba8fdfdd10f70d54c04fd61cb68.pdf} } @article { author = {El-Sayed, Hind and Rawway, Mohammed and Abed, Nermine and Salah El Din, Rawhya}, title = {Antibacterial activity of phenolic extract of Spirulina platensis and its structural elucidation of bioactive compound}, journal = {Egyptian Journal of Phycology}, volume = {18}, number = {1}, pages = {45-57}, year = {2017}, publisher = {The Egyptian Phycological Society}, issn = {1110-8649}, eissn = {2735-3826}, doi = {10.21608/egyjs.2017.115987}, abstract = {Spirulina as many other cyanobacteria species have the potential to produce a large number of antimicrobial substances, so they are considered as suitable organisms for exploitation as biocontrol agents of  pathogenic bacteria. In the present study, antimicrobial activity of Spirulina platensis phenolic acid extract was investigated against pathogenic bacteria which cause sepsis in neonates. The algal extract was tested in vitro for their antibacterial effect against (Bacillus cereus, Enterococcus casseliflavus, Kocuria kristinae, Staphylococcus aureus, Alloiococcus otitis, Rosemonas gilardii,and Aeromonas hydrophila) using paper disc diffusion method and observed all these bacteria showed inhibition in growth by this extract. The bioactive components of Spirulina platensis have been assessed using GC-MS analysis. Eleven compounds in phenolic acid extract of the alga were identified. Bis(2-ethylhexyl) Phthatate (25.899%), Palmitic acid (14.263%) ,were the most prevailing compounds in phenolic acid extract.}, keywords = {Spirulina platensis,Antibacterial activity,Sepsis,paper-disc diffusion method,Gas chromatography-mass spectrometry (GC-MS) analysis}, url = {https://egyjs.journals.ekb.eg/article_115987.html}, eprint = {https://egyjs.journals.ekb.eg/article_115987_f8587a5b405cbbae74439f704744b5c5.pdf} } @article { author = {Mansour, Enas and El-Said, Soha and Al-Kenawy, Diaa}, title = {Evaluation of phytoplankton diversity in periphyton based aquaculture system}, journal = {Egyptian Journal of Phycology}, volume = {18}, number = {1}, pages = {59-75}, year = {2017}, publisher = {The Egyptian Phycological Society}, issn = {1110-8649}, eissn = {2735-3826}, doi = {10.21608/egyjs.2017.115988}, abstract = {This study was done to determine the impact of rice straw as a substrate for periphyton production and phytoplankton biodiversity in earthen fish ponds belongs to the world fish center. The ponds have the same area of Six 1000 m2 and the depth of water 1m. The ponds cultured with mono six Nile tilapia fry in the rate of 3 fry/ m2.  All ponds were fertilized with dry chicken manure in the rate of 15 kg/pond/week, and divided into two treatments, each of 3 replicates; the first treatment (T1), the substrate free control, while second treatment (T2) received 45 kg dry rice straw/pond. The samples were collected monthly from May to December 2017. The quantitative measurements for phytoplankton showed that total count of phytoplankton in water was higher in T1 than T2. The rice straw was effective for controlling growth of cyanophyceae compared to controls, and was capable for inhibiting the growth of Microcystis. Phormidium, Merismopediam, Gloeocapsa, Lyngbya and Chlorella, but Chrococcus, Synedra and Navicula sp. had improved growth in the presence of rice straw.Concerning periphyton the total count was (2103.68 x 106 org. /m2 as an average). And Chlorophyceae represent the dominant group with average (1577.07 x 106 org. /m2). The biodiversity index of overall phytoplankton genera Taxa evenness were (1.95 and 0.51) respectively in T2 which indicates that there is a high biodiversity of algae compared to T1 (1.76 and 0.42). The results of this investigation indicated that rice straw could introduce an accessible practical and commercial method to increased phytoplankton biodiversity.}, keywords = {diversity,earthen fish ponds,Periphyton,phytoplankton,rice straw,Nile tilapia}, url = {https://egyjs.journals.ekb.eg/article_115988.html}, eprint = {https://egyjs.journals.ekb.eg/article_115988_c45cf63093a02a0ee2c01b73059d2252.pdf} }