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Wafa Tahar

  • Biodiversity Journal, 8 (3): 777-782

    Faiza Oudjane, Naziha Bourenane & Tahar Wafa
    Feeding habits and condition of the seabream Sparus aurata Linnaeus, 1758 (Perciformes Sparidae) in the gulfs of Skikda and Annaba (Northeast of Algeria)

    ABSTRACT
    The Feeding habits of the royal seabream Sparus aurata Linnaeus, 1758 (Perciformes Sparidae) in the northeast of Algeria were continuously monitored from April 2013 to May 2014. A study was carried out on the digestive content of 380 specimens, with a total length ranging between 18.1 cm and 48 cm. Overall, 1615 preys belonging to ten different phyla (Chordata, Echinodermata, Crustacea, Chlorophyta, Mollusca, Annelida, Bryozoa, Platyhelmintha, Nemathelmintha, Tallophyta), were computed. The reoyal seabream S. aurata has a widely varied diet. At a juvenile stage it is omnivorous, feeding on different benthic preys (i.e. shellfishes, molluscs, annelids, plants), on pelagic ones (fishes, eggs and Copepods), and Chlorophycea algae, as well. On a further stage, it shows a predatory feeding behavior, with molluscs constituting its preferential food as shown by the Main food index (MFI) values.

  • Biodiversity Journal, 7 (3): 337-344

    Wafa Tahar, Ouahiba Bordjiba & Lyamine Mezedjri
    Study of the effect of a fungicide "the tachigazole" on some indicators of soil biological activity

    ABSTRACT
    This study tests the impact of a pesticide molecule (hymexazole) on, on the one hand, the physio-biochemistry of hard wheat Triticum durum Desf. (Poales Poaceae) and on the other hand, the indicators of soil biological activity. To do this, the analysis has focused on total proteins, proline, the total carbohydrates and total chlorophyll of wheat leaves. Total carbon and soil organic matter have been also determined. Results reveal that the levels of total chlorophyll are practically identical in the presence of different doses of the fungicide in comparison with those of the control dose. The contents of other parameters (total proteins, carbohydrates and proline) are slightly different from those obtained for witnesses doses. Finally, the analyzed soil samples show that the values of the total carbon are higher and exceed the standards in the samples treated with fungicide.

  • Biodiversity Journal, 12 (2): 0345-0356

    Wafa Tahar, Lyamine Mezedjri & Ali Tahar
    Hydric pollution assessment generated through the petrochemical industrial zone in the Skikda region (North-East Algeria)
    https://doi.org/10.31396/Biodiv.Jour.2021.12.2.345.356

    ABSTRACT
    In this study, we carried out a diagnosis of the quality of the wastewater discharged from the Skikda industrial zone, compared with three control points, in the natural environment. The study has been conducted over two consecutive years and on a regular basis, monitoring 10 selected stations and 19 characteristics, giving a total of 4,560 analyses. The measurements show a very pronounced degradation of the quality of the wastewater of the 7 selected complexes with accentuated chemical and hydrocarbon pollution. The statistical approach adopted allows us to group the stations studied into 5 homogeneous groups, with a similarity level of 96.84%. This approach provides some information on the industrial activity influence in the Gulf of Skikda on the immediate environment (Oued Saf-Saf and Mediterranean Sea) with consequences and impacts on environmental quality in the region.