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العنوان
Flora of Wadi Gebal, Saint Katherine Protectorate, South Sinai :
الناشر
Ibrahim Abd El Rafee Ibrahim El Gamal,
المؤلف
El Gamal, Ibrahim Abd El Rafee Ibrahim.
هيئة الاعداد
باحث / Ibrahim Abd El Rafee Ibrahim El Gamal
مشرف / Abd El-Hamid A. Khedr
مشرف / Sami Hussein Rabei
مناقش / Hasnaa A. Hosni
الموضوع
Botany - South Sinai.
تاريخ النشر
2020.
عدد الصفحات
139 p. :
اللغة
الإنجليزية
الدرجة
الدكتوراه
التخصص
علوم النبات
تاريخ الإجازة
29/4/2020
مكان الإجازة
جامعة دمياط - كلية العلوم - Botany and Microbiology
الفهرس
Only 14 pages are availabe for public view

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Abstract

This study titled with Flora of Wadi Gebal, Saint Katherine Protectorate, South Sinai: Some additions and Taxonomic revision aimed to detection of flora current status within the study area in addition to taxonomic revision of genus Datura. This study was categorized into three main section each of which has it is particular issue. Part I: wild flora and addition to flora of Egypt. Represented by flora of wadi Gebal region and the other sites that survived during exotic species study (section 2) and revealed that
A total of 235 wild taxa were recorded representing 50% of known wild flora of Saint Katherine protectorate, belonging to 175 genera and 53 families including 1- Three taxa as new records to flora of Egypt those Clinopodium serpyllifolium (M. Bieb.) Kuntze subsp. barbatum (P.H.Davis) Bräuchler, Datura ferox L. and Papaver somniferum L. the last one escaped from cultivation. 2-Nine taxa as new record to Sinai. 3- Twenty five new records to Saint Katherine protectorate. 4- Fourteen endemic and steno-endemic taxa that represented 82% of Saint Katherine protectorate endemic taxa and 23% of Egyptian endemic taxa. The surveyed flora represented by Angiospermae (Dicotyledoneae 199 taxa, and Monocotyledoneae 31spp.) while Gymnospermae and Pteridophyta represented by three and two species respectively. The largest families were Asteraceae, Poaceae, Lamiaceae and Caryophyllaceae rather than eleven families were represented by two species, and twenty one families represented by one species only. The study of surveyed flora Chorology revealed that 132 taxa were mono-regional including one taxa related to sub-tropical, 64 taxa were bi-regional, 24 taxa Poly-regional and 14 taxa were endemic and steno-endemic. Investigated taxa are distributed in four microhabitats viz. wadi, terraces, gorges and slopes. Distribution of plant species was higher in gorges; wadi bed; Shannon index, richness, frequency and density were significantly higher in gorges and wadi bed compared to the other microhabitats. Climatic changes especially drought, over collection, overgrazing and invasive species considered as main threats to nature flora within the study area. The study of exotic species documented that- Twenty four plant species used as traditional crops; those investigated species were established in Bedouin orchids without notable environmental problems. 2- Away from traditional crops; a total of 34 alien were introduced by hand for one or more of following reasons as garden ornamentals, medicinal, economic plants, agro-forestry species and / or planting inter-mountainous road. 3- Investigated alien species can be classified as (A)-Native or naturalized species in different phytogeographical region away from South Sinai. (B) - Non-native species represented by twenty nine species. 4- Alien species were dominant by perennial trees and shrubs (73%) phanerophyte, chamaephyte while annual species were rare represented only by 3 species. On the other hand their native associated species were mainly herbaceous (60%); shrub (32%) and trees represented by 4% only. 5- The majority of investigated alien was with low frequency as frequencies ranged between 0.88% (only observed once) to 26.54 %. 6-Detailed study of three high frequencies species revealed that all of Eucalyptus gloulus, Acacia saligna and Nerium oleander have negative impact on wild flora. 7-The rest of recorded taxa needs more studies. Part III: Taxonomic revision of genus Datura in Egypt. The genus Datura in Egypt has not been revised before. This taxonomic synopsis includes information on distribution, seed micromorphology and a new key to the species of Datura in Egypt is provided after addition of D. ferox to the flora of Egypt in 2018 as a result of our study. Leaf shape, fruit shape, corolla lobes termination apex, shape and number of spines among of twenty four morphological characters are most significant characters to separate the studied taxa from each other. Seed micro-morphological features of four Datura species were studied using scanning electron microscopy (SEM); seed color, anticlinal cell wall shape, ventral surfaces ridge, deep grooves, hilum position and shape were the most significant features to separate the investigated species. The studied seed characters were used to create another systematic key. The dendrograms and cluster analysis showed that Datura species could be grouped into two major clusters each of them comprising two species. This similarity correlation within target species showed complete agreement with previous phylogenetic studies. The results indicate that some morphological features as well as seed micro-morphology would be significant in the identification of Datura species.