Rédda Aboura

• Biodiversity Journal, 13 (1): 0025-0035

  Fatima Bendiouis, Rédda Aboura, Mustapha Ainad Tabet & Fatiha Barka
  Characterization of the biodiversity of ornamental flora in the urban perimeter of the city of Tlemcen (Northwest of Algeria)
  https://doi.org/10.31396/Biodiv.Jour.2022.13.1.25.35

  ABSTRACT
  The objective of this study was to analyze and characterize the biodiversity of the ornamental flora in the urban perimeter of the region of Tlemcen (Northwest of Algeria) in the two public gardens chosen in the city of Tlemcen. By considering in this approach the various statistical indices of plant biodiversity that will allow us a better knowledge of the ecological potential of the environment to shelter a wide range of taxa adapted to the ecological conditions of the biotope considered. The results obtained showed a large number of species from a floristic richness point of view, including 86 ornamental species recorded in the 1^er Juin garden (Grand Bassin) and 24 in the Boujlida garden. The biogeographical origin of the inventoried species at the level of the study stations revealed a considerable number of species of the non-Mediterranean type compared to the Mediterraneanone. The calculation of the different diversity indices confirms different outstanding representatives of the plant species within their taxonomic families. The Shannon index was the values obtained of 5.24 in the garden of 1^er Juin compared to those of Boujlida with 3.72, which determined more interesting representativeness of the abundance of the species counted within their respective families in the first garden by contribution to the second. The Simpson index makes it possible to note greater representativeness of all the species within the Boujlida garden with a percentage of 50% compared to that of 1^er Juin, which was only of the order of 30%. Finally, we can conclude that these two gardens offer an opportunity to develop the ornamental flora of the city of Tlemcen while trying to promote the introduction of native species for sustainable preservation to ensure the sustainability of these taxa.

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• Biodiversity Journal, 12 (2): 0369-0378

  Ibrahim Benmechta, Rédda Aboura & Brahim Babali
  Composition and diversity of Osyris L. (Santalales Santalacae) communities in the Tlemcen region
  https://doi.org/10.31396/Biodiv.Jour.2021.12.2.369.378

  ABSTRACT
  The region of Tlemcen has a very rich and diverse flora heritage thanks to its geological and climatic variations. The genus Osyris L. (Santalales Santalaceae) is a semi-parasitic species which remains continually subject to host plants that are not well known in our study area. Our main objective was to search for this species, to inventory the taxa which enter into the structuring of its populations in the Tlemcen region and then to characterize them systematically, biologically and biogeographically. The bioclimatic approach of the stations studied shows a lower semi-arid bioclimatic stage which has an influence on the floristic procession of these stands dominated by therophytes. The floristic inventory carried out enabled us, above all, to identify certain host plants specific to the presence of this genus with its two species Osyris alba L. and O. lanceolata, Ochst et Steud. in the Tlemcen region. This presence obeys specific ecological conditions which will give a certain distribution that we will detail in our next work.

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