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Mustapha Boudjenah

  • Biodiversity Journal, 12 (4): 0855-0863

    Mustapha Boudjenah
    Characterization of the ecosystem and the status of phytoplankton populations in the Alboran Sea and the Algerian Basin from 2013 to 2015 during the spring season
    https://doi.org/10.31396/Biodiv.Jour.2021.12.4.855.863

    ABSTRACT
    Knowledge of the taxonomic composition of phytoplankton communities is necessary for monitoring the productivity of an environment. It is through the understanding of the mechanisms, which promote the succession within phytoplankton populations, that we can estimate the productive capacities of the studied environments. The main purpose of this study is to make a quantitative and qualitative assessment, in order to explore the diversity of the phytoplankton community and the differences that exist between the Alboran Sea and the Algerian Basin, which will allow us to decide about the general state of the phytoplankton ecosystem on the Algerian coast. We made an assessment of the environmental factors that affect the structure and dynamics of phytoplankton communities; we recorded a mean seasonal temperature and salinity, respectively, on the Algerian coasts of about 15.76 ± 0.60 °C and 36.48 ± 0.3 PSU and we did not note any significant differences between the Alboran Sea and the Algerian Basin. Mean nutrients concentrations were recorded as follows: nitrates of 0.273 ± 0.130 μmol / l; nitrites of 0.085 ± 0.065 μmol / l; phosphorus, of 0.286 ± 0.395 μmol / l and silicates of 0.375 ± 0.366 μmol / l, in the Algerian Basin and the Alboran Sea. We notice a decreasing gradient from West to East. We also identified and determined the phytoplankton species that describe the diversity of populations within the community; 361 species, comprising several genders, have been identified. Dinoflagellates are the most represented with 60.11% of species, diatoms represent 38.50% and other species represent only 1.39%.

  • Biodiversity Journal, 10 (2): 081-092

    Mustapha Boudjenah, Zakia Mokrane & Dina Soualili
    Diversity of Phytoplanktonic populations along the Algerian coastline
    https://doi.org/10.31396/Biodiv.Jour.2019.10.2.81.92

    ABSTRACT
    Phytoplankton biodiversity is the basis of the functioning of the aquatic ecosystems. Also, understanding and evaluating the effects of the change in our environment and their impact on planktonic populations is an important element. In fact, this paper was to appreciate the diversity and composition of phytoplankton in relation to some physicochemical parameters. Water samples were collected along the Algerian coastline (Alboran Sea, the Algerian basin and the Middle area), during the period May–June 2013. The study area contained a diversified phytoplankton community (296 species), belonging to 138 genera. The algal groups were represented and classified as dinoflagellates (180 species), diatoms (103 species), cyanophyceae, coccolithophorids, euglenids, and chrysophytes (13 species). The spatial distribution of cell densities revealed a heterogeneous phytoplankton composition dominated by dinoflagellates, which represent 63% of the total abundance, followed by diatoms (35%). Quantitatively, we observed a highest cell density and diatoms abundance in most stations of the Alboran Sea decreasing towards the east (Algerian basin). The peak of dinoflagellates in June was represented by Prorocentrum and Gymnodinium genera.