Title: Environmental relationships of aquatic vegetation in the fresh water ecosystem of the Nile Delta, Egypt
Abstract: African Journal of EcologyVolume 49, Issue 1 p. 103-118 Environmental relationships of aquatic vegetation in the fresh water ecosystem of the Nile Delta, Egypt Monier Abd El-Ghani, Corresponding Author Monier Abd El-Ghani E-mail: [email protected]Search for more papers by this authorAbdel M. El-Fiky, Abdel M. El-Fiky Botany Department, Faculty of Science, Cairo University, Giza 12613, EgyptSearch for more papers by this authorAshraf Soliman, Ashraf Soliman Botany Department, Faculty of Science, Cairo University, Giza 12613, EgyptSearch for more papers by this authorAdel Khattab, Adel Khattab Botany Department, Faculty of Science, Cairo University, Giza 12613, EgyptSearch for more papers by this author Monier Abd El-Ghani, Corresponding Author Monier Abd El-Ghani E-mail: [email protected]Search for more papers by this authorAbdel M. El-Fiky, Abdel M. El-Fiky Botany Department, Faculty of Science, Cairo University, Giza 12613, EgyptSearch for more papers by this authorAshraf Soliman, Ashraf Soliman Botany Department, Faculty of Science, Cairo University, Giza 12613, EgyptSearch for more papers by this authorAdel Khattab, Adel Khattab Botany Department, Faculty of Science, Cairo University, Giza 12613, EgyptSearch for more papers by this author First published: 06 October 2010 https://doi.org/10.1111/j.1365-2028.2010.01237.xCitations: 8Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinkedInRedditWechat Abstracten In generalized four sectors, 350 stands (water channels) in 50 selected and geo-referenced sites with eighteen environmental factors were surveyed. The total number of recorded species varied from a sector to another: 21 in the northern, nineteen in the middle, seventeen in the western and sixteen in the eastern. New populations of Cyperus papyrus were explored. Vallisneria spiralis, Elodea canadensis and Najas armata were among seven extinct species that were not recorded few decades ago. The floristic composition alteration may be because of the addition of organic matter of plant and animal origin and the discharge of industrial and sewage effluents. Classification and ordination analyses (DCA) resulted in the segregation of seventeen vegetation groups (communities), three of them were repeatedly recorded; namely Phragmites australis-Eichhornia crassipes, Phragmites australis-Myriophyllum spicatum and Potamogeton pectinatus-Myriophyllum spicatum. Phragmites australis-Cyperus papyrus group was a new community spreading in the eastern sector of the Delta. Electric conductivity, Fe, Hg and chemical oxygen demand (COD) showed high significant variation (P < 0.001) among the vegetation groups. Other significant variables were Cl, Ca, NO3, pH and SO4 (P < 0.047). Redundancy analysis (RDA) was chosen as the appropriate ordination method to perform direct gradient analysis. Trace elements Cu, Fe, Hg and Pb participated in the floristic and chemical composition of each sector. Résuméfr Dans quatre secteurs généralisés, 350 emplacements (des canaux) ont été surveillés dans 50 sites choisis et géoréférencés, où eighteen facteurs environnementaux ont été suivis. Le nombre total d'espèces rapportées variait d'un secteur à l'autre, 21 au nord, nineteen au centre, seventeen à l'ouest et sixteen à l'est. De nouvelles populations de Cyperus papyrus ont été explorées. Vallisneria spiralis, Elodea canadensis et Najas armata faisaient partie de sept espèces éteintes qui n'avaient pas été rapportées il y a quelques décennies. La modification de la composition floristique pourrait être due à l'addition de matière organique d'origine végétale ou animale et au rejet d'effluents industriels ou d'égouts. Des analyses d'ordination et de classification (detrended correspondence analysis – DCA) ont abouti à la ségrégation de seventeen groupes végétaux (communautés) dont trois ont été rapportés de façon répétée, à savoir Phragmites australis-Eichhornia crassipes, Phragmites australis-Myriophyllum spicatum et Potamogeton pectinatus-Myriophyllum spicatum. Le groupe Phragmites australis-Cyperus papyrusétait une nouvelle communauté qui se répand dans le secteur est du delta. La conductivitéélectrique, Fe, Hg et DCO présentaient des variations très significatives (P < 0,001) selon les groupes végétaux. Parmi les autres variables significatives, citons Cl, Ca, NO3, le pH et SO4 (P < 0,047). L'analyse de redondance (RDA) fut choisie comme le moyen d'ordination approprié pour réaliser une analyse de gradient directe. Des traces des éléments Cu, Fe, Hg et Pb se trouvaient dans la composition floristique et chimique de chaque secteur. References Abu Al-Izz, M.S. (1977) Land Forms of Egypt. 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Google Scholar Citing Literature Volume49, Issue1March 2011Pages 103-118 ReferencesRelatedInformation
Publication Year: 2010
Publication Date: 2010-10-06
Language: en
Type: article
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