ORIGINAL_ARTICLE
Species composition and population density of Phytoplankton of Great Bitter Lake, Suez Canal, Egypt.
The structure and dynamic of phytoplankton assemblages in Great Bitter Lakes were studied seasonally duringthe period from May 1999 to February 2000. Population density varied between112198X103 cells. l-1 in springand 2382X106 cells. l-1 in winter. In terms of cell number, Bacillariophyceae was the most important group(mean annual percentage contribution was 67%), which remained dominant throughout the study period.Cyanophyceae ranked the second abundant group (14 %) dominated in autumn and winter. The contribution ofDinophyceae and Chlorophyceae were 8.6 and 7.3% respectively. The other classes contributed with very lowshare of the total phytoplankton. The relationship between phytoplankton composition and physico-chemicalvariables was studied. CCA analysis indicated that water salinity, and temperature are the most important factorsaffecting phytoplankton distribution. The trophic status index indicated that the lake ranked betweenmesotrophic and moderately eutrophic. In winter, the lake was under blooming due to the luxuriance growth ofNitzschia pseudo delicatissima Hasle. and Phormidium sp. The impact of pollution was significantly effective inthe western side of the lake compared to the eastern one.
https://taec.journals.ekb.eg/article_12464_357e81677f7cac87f019a61f10c40551.pdf
2001-12-31
187
203
10.21608/taec.2001.12464
phytoplankton
Bitter Lakes
trophic status
C.C.A
Ecology
Taxonomy
Mona
Gab Allah
1
Botany Department, Faculty of Science, Ismailia, Suez Canal University.
LEAD_AUTHOR
ORIGINAL_ARTICLE
Macroalgal communities of the Suez Canal after the recent improvement of marine habitats
The macroalgal communities of the Suez Canal were seasonally investigated at 16 sites during 1996 and 2000. Ahundred and twenty eight taxa including 15 new records were identified. The recent reduction of navigation andurbanization works resulted in an increase in species richness (42 species) and algal forms.Distribution pattern, seasonal variation, and algal zonation were also examined. All were intenselyregulated by substrate, space, depth, light, and water movement during the passage of ships. Sites were clustered,on the basis of species co-occurrence, into five groups, suggesting division of the Suez Canal into four biologicalsectors. The hard substrata supported distinct algal zones. Cladophoropsis zollingeri and Bangia fuscopurpureacharacterized the littoral zone. A rich algal community dominated the infralittoral at a depth of 30-150 cm, whilea few red species with Caulerpa racemosa were found deeper. Competition for space in some sites was evidentby presence of 61 epiphytic macroalgae. A half of these were also found on hard substrata when the space wasavailable.Algal succession in the canal during the past century was also discussed in the light of environmentalchanges. Algal succession could have passed through four stages; including the establishment of pioneers until1924, the maturity to a climax sometime before1953, degradation of the climax due to navigation andurbanization constructions, and the reestablishment of the climax with the recent improvement in algal habitats.
https://taec.journals.ekb.eg/article_12465_7bd56fbb6a3b46a80f12f1e84bcb469b.pdf
2001-12-31
205
219
10.21608/taec.2001.12465
Egypt
Macroalgae
marine habitat
Red Sea
Succession
Suez Canal
Islam
El-Manawy
1
Department of Botany, Faculty of Science, Ismailia, Suez Canal University.
LEAD_AUTHOR
ORIGINAL_ARTICLE
Morpho-anatomical characters of the achene in certain species of sub-family Rosoideae (Rosaceae), a comparative study
The morpho-anatomical characters of 18 species belonging to six genera of sub-family Rosoideae wereinvestigated. The anatomical characters of both the pericarp and testa were found to be impracticable for speciesdelimitation since they are consistent at the generic level. The same reason rendered the character evaluationinvaluable within the species of the same genus. Of the morphological characters the mode of the achenevasculature as well as its ramification varied in the different taxa. The basic number of the achene supply is onemedian and two lateral strands. The behaviour of the latter, whether distinct or fused, as well as the ramification ,or not, of a part or the whole of the vascular skeleton led to the suggestion of a key-like layout which shows thepathway of these character states as being primitive vs advanced.
https://taec.journals.ekb.eg/article_12466_c1436e2b533ec04d28e8e06db25dedee.pdf
2001-12-31
221
238
10.21608/taec.2001.12466
Achene
anatomy
Morphology
Rosaceae
Rosoideae
Magdy
Mourad
1
Botany Department, Faculty of Science, Ain Shams University, Cairo, Egypt.
AUTHOR
Abd El-Salam
Al- Nowaihi
abdelsalamalnowaihi@hotmail.com
2
Botany Department, Faculty of Science, Ain Shams University, Cairo-Egypt.
LEAD_AUTHOR
ORIGINAL_ARTICLE
Plantaginaceae in the flora of Egypt 1.Systematic revision of the indigenous taxa
Plantago is the representative genus of Plantaginaceae in Egypt, it comprises 19 species of which Plantagoweldenii Rchb. is recorded new to the flora of Egypt. Stem, leaf shape and size, and inflorescence are keycharacters while floral characters are useful for the separation between the closely allied taxa.
https://taec.journals.ekb.eg/article_12467_a3a08a9747d8817d9dfbc6d98701b9d8.pdf
2001-12-31
239
255
10.21608/taec.2001.12467
Plantaginaceae
Plantago
systematic
Egypt
Amal
Hosny
amal-hosni@hotmail.com
1
The Herbarium,Faculty of Science, Cairo University, Giza-12613,Egypt.
LEAD_AUTHOR
Nahed
Waly
nwaly89@hotmail.com
2
The Herbarium,Faculty of Science, Cairo University, Giza-12613,Egypt.
AUTHOR
ORIGINAL_ARTICLE
Capparaceae in the flora of Egypt
A systematic revision of the native species of the family Capparaceae (Cleome excluded) was carried out. Thepresence of Boscia angustifolia in Egypt is uncertain, while Capparis spinosa is represented in Egypt by 3varieties viz. : spinosa, inermis & deserti.Diagnostic characters of the taxa are given and a key for the separation of species and varieties, synonyms andnotes on distribution are provided. SEM features of the leaf epidermis were proved to be of taxonomicsignificance.
https://taec.journals.ekb.eg/article_12468_61f85f51cd05b5fce9363e9d6f66b186.pdf
2001-12-31
257
267
10.21608/taec.2001.12468
Boscia, Cadaba, Capparaceae, Capparis, Dipterygium, Egypt
Maerua
Zeinab
El Karemy
aafyed65@yahoo.com
1
Botany Department, Faculty of Science, Assiut University, Assiut, Egypt
LEAD_AUTHOR
ORIGINAL_ARTICLE
Effect of Petroleum oil on the germination, growth and yield of broad bean plants
The effect of crude oil on germination, growth and yield of broad bean was tested in contaminated soil. A seriesof soil pollution levels, ranged between 1% and 10% (w/w) were prepared. The seed germination, vegetativegrowth and yield of broad bean were investigated. Low concentration of crude oil was found to stimulate thevegetative growth and increase the yield. High concentration of crude oil (4% and above) reduced thegermination percentage ,vegetative growth and yield. At concentrations of 8% & 10%, many seedlings hadreduced growth and survival. Hydrocarbons accumulated in shoot and pods (seeds) were separated andmonitored by quantitative gas chromatography (GC.). The residual n-alkanes and iso-alkanes of the saturatesfraction were decreased with increasing the pollution levels. Lighter n-alkanes (C10 – C20) were found only in theshoots, while the higher carbon number n-alkanes (C20 – C31) were detected in both shoots and pods. The resultssuggested not to grow edible plants in areas subjected to low or high concentration of petroleum oil.
https://taec.journals.ekb.eg/article_12469_b7acbb761fbde1bb79f89ddb1f2177de.pdf
2001-12-31
269
282
10.21608/taec.2001.12469
broad bean
Germination
Growth
petroleum oil
yield
H.
El- Tantawy
1
Science Department, College of Basic Education P.O. Box 34053, Adailya, Kuwait
LEAD_AUTHOR
A.
El- Hilaly
2
Science Department, College of Basic Education P.O. Box 34053, Adailya, Kuwait
AUTHOR
ORIGINAL_ARTICLE
Contributions to the moss flora of the Egyptian Oases. 1. Farafra Oasis.
Twelve moss species are reported for the first time from Farafra Oasis (Western Desert of Egypt). Eight of thembelong to Bryum of which Bryum inclinatum is a new record to Egypt. The number of mosses known from theOases territory is raised from 15 to 23 species. Floristic comparisons show more elements in common withNorthern Africa and Sinai than with the Nile Region.
https://taec.journals.ekb.eg/article_12470_af787bd9f23223056a7524c0e3f95b23.pdf
2001-12-31
283
290
10.21608/taec.2001.12470
Bryoflora
Egypt
Farafra Oasis
Mosses
Usama,
Abou-Salama
1
Botany Department, Faculty of Science, Ain Shams University, Cairo-Egypt.
AUTHOR
Wagieh
El-Saadawi
elsaadawy@link.net
2
Botany Department, Faculty of Science, Ain Shams University, Cairo-Egypt.
LEAD_AUTHOR
ORIGINAL_ARTICLE
Contributions to the moss flora of the Egyptian Oases. 2. Siwa Oasis
Ten moss species are reported as pioneer records of the Bryoflora in Siwa oasis. All taxa except Bryum speciesare new records to Libyan Oases territory, while Tortella inclinata is a new record to Egypt. This brings the totalnumber of fully identified Egyptian mosses to 176 entities and that of Egyptian Oases to 30 mosses. Bryumbicolor is recorded fruiting for the first time in Egypt. Notes on habitats, sex organs and fruiting are given. Keyfor the recorded species and illustrated drawings for Tortella inclinata & Bryum bicolor are also provided.
https://taec.journals.ekb.eg/article_12471_c7352c9190a0d0ce31b70f7cd777c8c0.pdf
2001-12-31
291
302
10.21608/taec.2001.12471
Bryoflora
Egyptian Oases
Siwa Oasis
Mahmoud
Refai
1
Botany Department, Faculty of Science, Ain Shams University, Cairo-Egypt.
LEAD_AUTHOR