Ecotone repentigny3/5/2023 There were similarity for some species which found in northern coastal regions and other related to wild vegetation of the southern part of eastern desert of Egypt. Antimicrobial and acaricidal activities of methanolic extract for some wild taxa of the study area were screened. Classification of the vegetation was analysed using TWINSPAN technique resulted in the recognition of six vegetation groups, each of definite floristic composition. It also showed the percentages of the Mediterranean species were 47.29% and 31.07%of the Saharo-Sindian species. Phytochorological analysis revealed that 64 % of the studied species were Pluri-regional elements, of which 19 % being Cosmopolitan chorotype. Therophytes and chamaephytes were the most frequent, denoting a typical desert life-form spectrum. Poaceae, Fabaceae, Asteraceae, Chenopodiaceae and Brassicaceae were the largest families, and constitute more than 56.76% of the total number of recorded species. Al together, 74 species (25 perennials, 41 annuals, 5 short-lived perennials and 3 biennials) belonging to 70 genera and 25 families of the flowering plants were recorded and one related to pteridophyta. analysis of vegetation along environmental gradients that prevail in the study area using the relative importance values of 25 perennials in 62 quadrates, followed by multivariate data analysis was presented. The aridity index used by the United Nations Environment Program (UNEP, 1997), indicates that this district lies in a hyper-arid region, with annual rainfall close to 0.0 mm. They are green patches amidst the surrounding sterile desert. The oases are the most prominent features of the Western Desert of Egypt. Vegetation composition and its relation to environmental variables in the palm groves along Kharga, Dakhla and Paris Oases in the Western Desert of Egypt, were examined. Time lag between a relative stabilization of species distribution and the reduction of natural disturbances (water level fluctuations and fires) could be a possible cause of the importance of spatio-temporal variables and the undetermined portion of species variation. In total, 48.9% of the species variation is explained by the two data sets. Interaction between small-scale and large-scale variations explains another 1.7%. Another 21.6% is explained by large-scale spatial distribution, and historical landscape dynamics. As a whole, small-scale variation accounts for 25.6% of the species variation. Peat thickness and water level are the most important abiotic variables correlated with plant community composition. americana or Myrica gale, to Typha, Typha/Lythrum, Carex lacustris and Calamagrostis canadensis marshes. Vegetation data were classified with agglomerative clustering into 11 community types, from Acer rubrum, Acer saccharinum and Fraxinus swamps, to scrubs dominated by Salix petiolaris, Alnus rugosa var. Evaluated the relative importance of small-scale variation in abiotic factors and large-scale spatio-temporal variation on the distribution of wetland vegetation of a section of the Upper St.
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