Papers by Magda F . El-Adl
Plant Physiology and Biochemistry
Al-Azhar Bulletin of Science- Basic Science Sector
This study was set out to document the marine algal species associated with limpets living on the... more This study was set out to document the marine algal species associated with limpets living on the rocky shores of the northeastern coast of Libya for the first time. Samples were collected from seven sites extend from Ras Hailal to Al-Hanyaa rocky shores during winter and spring 2012. Algal species associated with limpets in Al-Hanyaa polluted site were represented by two species belong to Chlorophyta and only one species for each Phaeophyta and Rhodophyta. On the other hand, a single species of Rhodophyta was recorded on Patella turbinata inhibiting the clean site of Susa. The present results showed that, the four algal species comprised Ulva, Enteromorpha, Ectocarpus and Gelidium, were found associated with P. turbinata and were the predominant species in polluted sites, while they disappeared completely at the clean sites. These results predicted that, Boergeseniella fruticulosa, growing either on Patella turbinata or the surrounding substrates, is a promising biomonitor for seawater cleanness. Also, the results confirmed the mutualism relationship between Patella and ephemeral algal species in the monitoring area, emphasizing their efficiency as biological monitors. Finally, in spite of physico-chemical parameters differences between siteswere significant, the diference between sites themselves were found to be non significant.
Scientific Journal for Damietta Faculty of Science
This work aims to study the seasonal fluctuation in physicochemical characteristics, trophic stat... more This work aims to study the seasonal fluctuation in physicochemical characteristics, trophic status, and some chemical and biological pollutants influencing phytoplankton diversity, and water quality in raw and treated water at Kafr El-Shinawy drinking-water treatment plant, Damietta-Egypt seasonally during 2018. Phytoplankton distribution was affected by the trophic status of water, level of pollutants, and physicochemical treatment processes (coagulation, flocculation and sedimentation) of water. The predominance of phytoplankton species, especially Aphanizomenon flos aquae (Cyanophyta), Gomphosphaeria lacustris (Cyanophyta), Microcystis aeruginosa (Cyanophyta), Nostoc punctiforme (Cyanophyta), Oscillatoria limnetica (Cyanophyta), Pediastrum simplex (Chlorophyta), and Melosira granulata (Bacillariophyta) in treated water was much less than in raw water. Trihalomethanes (THMs) levels in treated waters were higher than in raw water. On the contrary, lower concentrations of heavy metals were recorded in treated water. Phytoplankton cells exhibited a bioaccumulation capacity for heavy metals especially Mn, Zn, and Fe in both raw and treated water. Intracellular levels of microcystins were lower (0.003-0.011µg L−1) whereas the extracellular levels were higher (1.00-2.01 µg L−1) in treated water than raw water, and the former recorded the highest level in raw water during summer (1.3 µg L−1). Hence, the levels of dissolved microcystins and THMs in treated water were higher than the allowable limit, especially during summer, the season of luxurious growth of Microcystis species.
Scientific Journal for Damietta Faculty of Science
Macroalgae produce a wide variety of chemically active secondary metabolites. Brown seaweed; Sarg... more Macroalgae produce a wide variety of chemically active secondary metabolites. Brown seaweed; Sargassum vulgare and its associated seaweeds were collected from Hurghada Red sea coast of Egypt. Optimal physicochemical properties; slightly alkaline; low turbidity, moderate temperature and available nutrient content of saline water produced massive growth of S. vulgare (53% covering percentage) during autumn (2018). Heavy metals accumulation inside the investigated seaweed S. vulgare was within the usually range. The associated macroalgal species with S. vulgare are belonging to 9 genuses, 12 species. Chromatography, mass spectrophotometry (GC/MS) analysis revealed the presence of Twenty five bioactive compounds. The major phytochemical constituents in the chloroform extract of S. vulgare are n-Hexadecanoic acid 28.29 %, Heptacosane 8.04 %, trans-13-Octadecenoic acid 5.50 %, Oleic Acid 4.24 %, Palmitoleic acid 3.56 % and Hexadecanoic acid, ethyl ester 3.30 %.
Scientific Journal for Damietta Faculty of Science
The high trophic status of brackish water and sediments at the Deltaic coast, especially the high... more The high trophic status of brackish water and sediments at the Deltaic coast, especially the high nitrogen, phosphorus contents, along with relatively low pH and water temperature resulted in overgrowth of Ulva pertusa at El Garabaa and Ulva lactuca at Damietta river Nile Estuary. This represents an environmental problem of aquatic environment and water quality. On the other hand, this massive growth of Ulva species can be used as economic source of different natural products. The biochemical analysis of Ulva species indicated that Ulva pertusa have higher contents of proteins, lipids, minerals, soluble and insoluble carbohydrates than those of Ulva lactuca. The qualitative studies of natural products indicated that Ulva pertusa contains alkaloids, saponins, flavonoids, phenols and quinones while Ulva lactuca contains alkaloids, steroids, flavonoids, cumarins and quinones. Further study to determine the quantitative contents of natural products and its bioactivity is needed.
Scientific Journal for Damietta Faculty of Science
This study aims to compare between the marine alga Chaetomorpha vieillardi and the freshwater alg... more This study aims to compare between the marine alga Chaetomorpha vieillardi and the freshwater alga Cladophora glomerata. Water samples and massive growth of two species were collected from Port Said marine water pond and Ras El-Bar freshwater pond, respectively in 2019. The highly massive growth of Ch. vieillardi and C. glomerata, due to the trophic status and optimal physicochemical properties of their habitats, causes ecological and economic problems. The very high massive growth of two species leads to relatively complete elimination of dissolved oxygen (DO) at the middle and bottom level of water during the second half of the night. Loss of DO values led to great loss of aquaculture. Although both algal species were belonging to the same family, yet they prefer different habitats where, Ch. vieillardi formed bloom in marine water but C. glomerata in freshwater. The significant variation in the biochemical, phytochemical compositions and heavy metal bioaccumulation capacity of Ch. vieillardi and C. glomerata could be attributed to the variation in biological properties of two species and the physicochemical characteristics of their habitats. Ch. vieillardi has higher carbohydrate and lipid content compared to C. glomerata. Most heavy metals accumulated in C. glomerata was more than that in Ch. vieillardi, but Cu and Fe were highly accumulated in Ch. vieillardi.
Egyptian Journal of Phycology
Journal of Oceanology and Limnology
Journal of Plant Growth Regulation
Physiology and Molecular Biology of Plants
Journal of Coastal Life Medicine
as a part of MSc programme (Grant No. 110/2012). The journal implements double-blind peer review ... more as a part of MSc programme (Grant No. 110/2012). The journal implements double-blind peer review practiced by specially invited international editorial board members. Objective: To relate the chemical composition of Dictyota dichotoma (Hudson) J.V. Lamouroux (D. dichotoma) to variation of water characteristics at Hurghada, Egypt. Methods: Sea water and D. dichotoma fronds were collected from Hurghada shores, during autumn of 2014. Water samples were analyzed and fronds of D. dichotoma were biochemically quantified. Results: Sea water was characterized with high levels of salinity, P and heavy metals but with low content of nitrogen. The confined nature and the high evaporation of the Red sea contribute to the high salinity while the mining and transportation of phosphatic ore in the nearby region contribute to the high load of P and heavy metals. With the progress of season from September to November, water temperature was markedly reduced whereas pH and ionic content of water was reduced to a lesser extent, with marked alteration in ionic composition. With the progress of season towards winter, there was marked reduction in mineral composition of the fronds, shift in frond composition in favor of carbohydrates at the expense of proteins, lipids and alginates; and shift in the pigment composition in favor of chlorophylls at the expense of carotenoids and fucoxanthin. Conclusions: These facts point to active growth and photosynthetic activity during the cold period; that is, D. dichotoma is a cold water alga. D. dichotoma had moderate nutritive value, with moderate contents of carbohydrates, proteins, lipids and minerals. The mineral accumulation capacity of the fronds was more evident for N, P and K than for Ca, Mg and heavy metals.
Applied Ecology and Environmental Research, 2016
This investigation documents the presence of the alien macroalgal species Rivularia atra Roth ex ... more This investigation documents the presence of the alien macroalgal species Rivularia atra Roth ex Bornet & Flahault (Rivulariaceae: Nostocales) and Polysiphonia opaca (C. Agardh) Moris & De Notaris (Rhodomelaceae: Ceramiales) for the first time on the Libyan coastline. Of 7 investigated sites along Al-Jabel Al-Akhdar coastline during summer 2013 and winter 2014, three sites were invaded by R. atra and one site by P. opaca. The percent cover and relative frequencyas measures of abundance-of R. atra (15-24% and 40-70% respectively) were higher than those of P. opaca (8% and 17 % respectively). The investigation revealed that R. atra and P. opaca inhabited not only the rocky substrates but also the limpet Patella caerulea and that the two species do not thrive in polluted habitats. Statistical analysis showed a highly significant effect of season, site and their interaction on the physico-chemical characteristics of water. The results concluded that the nature of substrate as well as the extent of pollution may be major modifiers of algal distribution, since the non-polluted bare rocky shore was the favorite habitat for the alien species R. atra and P. opaca. Therefore, these species are promising indicators for water quality.
Field surveys were planned to screen and document the new macroalgal species of Al-Jabel Al- Akhd... more Field surveys were planned to screen and document the new macroalgal species of Al-Jabel Al- Akhdar coastline. Seven different sites (S1-S7) of the target area were randomly and independently visited during remittent times between October 2012 and April 2013 for collecting samples. Of 12 new record algal species, 6 were recorded for the first time for the Libyan algal flora; 3 for Al-Jabel Al- Akhdar coastline and 3 for the investigated area. These 6 newly record algal species for the Libyan environment were Vaucheria piloboloides Thuret (Heterokontophyta), Penicillus dumetosus (Lamouroux) Blainville, Cladophora laetevirens (Dillwyn) Kützing (Chlorophyta), Corallina pilulifera Postels & Ruprecht, Champia parvula (Agardh) Harvey and Thuretella schousboei (Thuret) F. Schmitz (Rhodophyta). The physico-chemical analysis indicated that, Ch. parvula, C. pilulifera, Bangia atropurpurea (Maertens ex Roth) C. Agardh, Lithophyllum incrustans Philippi, Caulerpa racemosa var. cylindracea (Sonde...
A comparative study of copper (Cu) and lead (Pb) treatments to Ulva lactuca introduced from Damie... more A comparative study of copper (Cu) and lead (Pb) treatments to Ulva lactuca introduced from Damietta harbor, was conducted by examining dry weight and pigmentation, total soluble sugars, protein, ascorbate and superoxide dismutase. The lower concentrations of Cu and Pb (0.01 and 0.1 mg l-1 respectively) increased contents of chlorophylls, carotenoids, and total soluble sugars, and also induced a strong activation of antioxidant activity in U. lactuca. However, concentration (0.1 mg l-1) of Pb exhibited a non significant change of dry weight and protein from untreated control. Whereas concentration (1 mg l-1) of both Cu and Pb induced both of enzymatic (Superoxide dismutase) and non enzymatic (Ascorbate) antioxidants, but inhibited dry weight and contents of carotenoids, protein and total soluble sugars in U. lactuca. In the other hand, chlorophylls (a and b) were induced in case Cu treatment but were inhibited in case Pb treatment at the same concentration (1 mg l-1). Although, high...
Egyptian Journal of Aquatic Biology and Fisheries, 2015
This study was designed to evaluate the new record seaweed Cladophora laetevirens (Dillwyn) Kützi... more This study was designed to evaluate the new record seaweed Cladophora laetevirens (Dillwyn) Kützing (Chlorophyta: Cladophorales) and Patella caerulea Linnaeus (Mollusca: Gastropoda) as bioaccumulating agents. The samples of two species were collected from polluted and unpolluted (reference) sites from the rocky shores of Al-Hanyaa coasts, Libya. Zinc (Zn), cadmium (Cd), lead (Pb) and copper (Cu) were determined using voltammetric technique. The results exhibited that, Cu occupied the highest level (559.15 ± 68.55 µg g-1 fresh weights) among metals accumulated by Cl. laetevirens in polluted site, followed by Pb and vice versa in unpolluted site, where Pb attained 179.71 ± 31.19 µg g-1 fresh weight. Despite that Cd has minimal concentration levels (either in Cl. laetevirens or P. caerulea tissues, at both sites), it recorded maximal bioaccumulation factors (BAFs) for Cl. laetevirens in both sites. Metal pollution index (MPI) recorded in a descending order as: Cl. laetevirens > P. caerulea gut > P. caerulea muscle for both sites. Cadmium was positively correlated with Cu and Pb in both sites. The present data and their analysis proved the consistency, appropriateness, tolerance and reliability of Cl. laetevirens as a bioindicator regardless the metal concentration levels in seawater. These results confirmed that Cl. laetevirens is the strongest accumulator for Cu, Pb and Cd while P. caerulea is a potential accumulator for Zn.
Pak. J. Bot, 2010
... PHYTOPLANKTON COMPOSITIONS AS A RESPONSE OF WATER QUALITY IN EL SALAM CANAL HADOUS DRAIN ... ... more ... PHYTOPLANKTON COMPOSITIONS AS A RESPONSE OF WATER QUALITY IN EL SALAM CANAL HADOUS DRAIN ... Abstract Considerable variation in water quality was found in El Salam canal; Hadous drain and Damietta branch of River Nile, Egypt. ...
Physicochemical analysis of water indicated that water temperature (15.9-31.5°c) and pH (6.97-7.6... more Physicochemical analysis of water indicated that water temperature (15.9-31.5°c) and pH (6.97-7.6) were suitable for phytoplankton growth. The nutrients concentration of water at study area decreased gradually from hyper-eutrophic at River Nile (site I) to eutrophic at out flow (site VI). The annual mean of phytoplankton species number was 90.1 and 87, which mainly belong to Bacillariophyta (36, 35 species), Chlorophyta (40.6, 39 species), Cyanophyta (12, 11 species) and Dinophyta (1.5, 1.5 species) at drinking water treatment plant intake of El-Bostan (site IB) and Faraskour (site IF) with significant increase during summer months. The annual mean of phytoplankton standing crop was 9435.2 x103 cell/L and 7613.2 x 103 cell/L at site IB and IF respectively. These due to high diatom growth (84.7%) followed by Chlorophyta (11.7 %) then Cyanophyta (3.6 %) and Dinophyta (0.001%). This annual mean of total phytoplankton standing crop was decreased at coagulation-floccuation basin at El-Bo...
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Papers by Magda F . El-Adl