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Ali Tahar

  • Biodiversity Journal, 9 (3): 187-194

    Ouroud Fellah, Samir Hameurlaine, Naziha Bourenane, Noureddine Gherraf, Amar Zellagui, Abdenabi Abidi, Ali Tahar, Muhammed Altun, Ibrahim Demirtas & Ayse Sahin Yaglioglu
    Climatic factors as quality determinant of essential oils and phenolics in Rosmarinus officinalis L. (Lamiales Lamiaceae) collected from three geographic areas in Algeria
    https://doi.org/10.31396/Biodiv.Jour.2018.9.3.187.194

    ABSTRACT
    The present work was aimed to evaluate the effect of the climatic factors on quality and quantity of essential oils and phenolic compounds of the aerial parts of Rosmarinus officinalis L. (Lamiales Lamiaceae) collected from three different geographic origins in Algeria (humid, semi arid, and arid). Gas-Chromatography/Mass-Spectroscopy analysis of essential oils revealed important disparities, both quantitatively and qualitatively. α-pinene and camphor as major components were found to range from 16.78 to 40.95% and from 11.24 to 36.72%, respectively. The assessment of total phenolics in water and ethyl acetate extracts of the three samples displayed a content ranging from 58.26 to 114.10 mg GAE (gallic acid equivalent)/g of water extracts and from 73.75 to 167.91 mg GAE/g of ethyl acetate extracts. The flavonoids content was found to vary from 14.63 to 28.86 mg QE (quercetin equivalent)/g of water extracts and from 66.2 to 93.1 mg QE/g of ethyl acetate extracts. Moreover, the HPLC analysis of phenolics revealed the presence of many compounds amongst which Hesperidin and Rosmarinic acid have relatively high contents in both extracts and in the three sites.

  • Biodiversity Journal, 9 (3): 181-186

    Souheïla Azzouz, Ali Tahar & Lyamine Mezedjri
    Comparative biometrics of Saurel Trachurus trachurus (Linnaeus, 1758) (Perciformes Carangidae) in the Algerian coast lines
    https://doi.org/10.31396/Biodiv.Jour.2018.9.3.181.186

    ABSTRACT
    During 2012–2013, a comparative biometric study was conducted on a coastal marine teleost fish of the Carangidae family Trachurus trachurus (Linnaeus, 1758). The comparison is made on the basis of seven samples obtained along the Algerian coastline. From East to West: El-kala, Annaba, Skikda, Collo, Jijel, Algiers, and Oran, carrying out 36 morphometric and meristic measurements on each fish. ANOVA Fixed-Variance Analysis of Variance shows the existence of significant differences between the seven sites for 36 variables, as well as the existence of a sexual dimorphism for 22 measured variables and the absence of significant differences for 14 variables out of a total of 36 studied variables. The comparison between the seven sites by MANOVA multivariate statistical tests confirms the results obtained by the ANOVA.

  • Biodiversity Journal, 9 (2): 121-126

    Boubaiou Abla, Ali Tahar & Lyamine Mezedjri
    Comparative Biometrics of a Teleost Fish, Boops boops (Linnaeus, 1758) (Perciformes Sparidae) of the Algerian coast lines
    https://doi.org/10.31396/Biodiv.Jour.2018.9.2.121.126

    ABSTRACT
    Algeria is a country characterized by its diversified ichthyological fauna of economic and ecological importance, which deserves to be valorized by a scientific study. Due to this, our study is dedicated to the comparative biometry of the Boops boops (Linnaeus, 1758) (Perciformes Sparidae), between seven sites located on the Algerian coastline from north-east to north-west: El-kalla, Annaba, Skikda, Collo, Jijel, Algiers, Mostaganem. This study is made due to the total absence of reliable and exploitable information concerning the morphometric and meristic characteristics of this Algerian coast fish. The comparative study was carried out using thirty-six morphometric and meristic variables. The analytical approach carried out shows that environment factors have an influence and effect, not only on the diversity of living beings, but on the morphological variation in the same species. In addition, the statistical approach allowed a spatiotemporal evaluation of the biometry of the B. boops from the seven sites. As a first step, all the univariate statistical analyzes carried out, suggest significant differences between the seven sites, as well as a possible sexual dimorphism. Also, the analysis of variance at a fixed model classification criterion shows, with respect to the site factor, very significant to very highly significant differences between the seven sites for thirty variables out of thirty-six; for the sex factor, there are no significant differences for thirty-two variables out of thirty-six. Other models have been studied. Thus, in general, the general linear model MANOVA confirms the results obtained by the ANOVA.

  • Biodiversity Journal, 7 (2): 229-232

    Souheila Ouamane, Lyamine Mezedjri & Ali Tahar
    Quality of swimming waters in the Gulf of Skikda (Algeria)

    ABSTRACT
    The purpose of this study is to determine the bacteriological and physico-chemical quality of swimming waters in the region of Skikda (Algeria), a popular tourist area known for its many beaches, through the water analysis of ten sites. This monitoring program was carried out for a period of five months.

  • Biodiversity Journal, 4 (2): 269-274

    Lyamine Mezedjri, Ahmed Kerfouf & Ali Tahar
    Reproductive cycle of the European anchovy Engraulis encrasicolus (Linnaeus, 1758) (Clupeiformes Engraulidae) in the gulf of Skikda (Algerian East coasts)

    ABSTRACT
    A study on the sexual cycle of the European anchovy, the pelagic fish Engraulis encrasicolus (Linnaeus, 1758) (Clupeiformes Engraulidae), was carried out in Algerian East coasts over a year (July 2008-June 2009). Annual sex-ratio (SR) showed that females dominate with an average male sex-ratio of 39.35%. The European anchovy spawning period ranges from April to October with peaks in the warmest months, strictly dependent on temperature. The gonado-somatic index was updated monthly which allowed us to divide the entire cycle into four successive phases: (i) a phase of slow maturation which occurs between the end of winter and the beginning of spring; (ii) a phase of significant sexual activity; (iii) a phase of emission of the sexual products which corresponds to the warmest months; and, finally, (iv) a phase of sexual rest occurring in the coldest months. Monthly variation of either hepato-somatic index or mesenteric fat reserves informed us about the origin of the energetic deposits, particularly important for the development of the gonads. In both sexes, the first sexual maturity is reached at a fish total length (Lt) of 12.5 cm.

  • Biodiversity Journal, 12 (4): 0833-0839

    Djaouida Nouasria, Lyamine Mezedjri, Ali Tahar & Azzedine Hadef
    Study of the flora richness of the region of Guelma (North East of Algeria): production of a preliminary list of species found
    https://doi.org/10.31396/Biodiv.Jour.2021.12.4.833.839

    ABSTRACT
    The present study is based on the inventory of the flora of a station characterized by an abundant population of Pistacia lentiscus L. and consists of a quantitative and qualitative analysis of this flora through significant parameters: global composition (number of taxa), morphological types, biological types, diaspore types and biogeographic distribution, in order to underline the importance of the floristic diversity of this region. The inventory carried out made it possible to identify 102 species belonging to 92 genera and 43 families, of which the most represented are those of Asteraceae 23.52%. The established biological spectrum shows a predominance of therophytes over the other forms with 32.35% where the Mediterranean element dominates (64.35%), this flora is characterized morphologically by the dominance of annual herbaceous plants (33.33%) and biologically by Therophytes as well as Anemochore species (29.41%).

  • 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.

  • Biodiversity Journal, 10 (3): 201-206

    Aïcha Benaldjia, Lyamine Mezedjri & Ali Tahar
    Comparative biometric study of sardine Sardina pilchardus (Walbaum, 1792) of the Algerian littoral (Actinopterygii Clupeiformes Clupeidae)
    https://doi.org/10.31396/Biodiv.Jour.2019.10.3.201.206

    ABSTRACT
    A compared biometric study of the sardine Sardina pilchardus (Walbaum, 1792) (Actinopterygii Clupeiformes Clupeidae) was carried on 471 specimens during the year 2015. These samples were taken from seven different sites of the Algerian coast going from the east to the west: El Kala, Annaba, Skikda, Collo, Jijel, Algiers, and Oran. The ANOVA test which was applied on each of the 36 variables morphometric and meristic shows that there is a highly significant difference between the seven sites for 35 variables out of 36. However, concerning the sex factor in the study area, we didn’t note significant differences between sexes. The comparison of the seven sites with the MANOVA test confirms the results obtained by the ANOVA.

  • Biodiversity Journal, 10 (1): 013-020

    Souheila Azzouz, Lyamine Mezedjri & Ali Tahar
    Reproductive cycle of the pelagic fish Saurel Trachurus trachurus (Linnaeus, 1758) (Perciformes Carangidae) Caught in the Gulf of Skikda (Algerian East Coast)
    https://doi.org/10.31396/Biodiv.Jour.2018.10.1.13.20

    ABSTRACT
    The present study focuses on the reproductive biology of the small pelagic fish Saurel Trachurus trachurus (Linnaeus, 1758) (Perciformes Carangidae), fished in the Gulf of Skikda on the Algerian east coast on an annual cycle from July 2014 to June 2015. The study of average sex ratio variations gave an average annual value of 49.98% in favor of males. The gonado-somatic ratio and the macroscopic examination of the gonads allowed us to locate the period of reproduction between December and April. This report highlights a sexual cycle composed of three successive phases; a slow maturation started from July to November, a phase of significant sexual activity corresponding to the laying period (December-April) and a phase of sexual rest coinciding with the month of May when the gonads recover their masses. On a monthly basis, the evolution of the hepatosomatic ratio values is similar to that observed in the gonado-somatic ones, which leads us to believe that the origin of the energy reserves of the gonads is not the liver and that Saurel is a fat fish, i.e. lipid accumulation occurs in the muscles. The study of mesenteric reserves confirmed the origin of gonadal energetic deposits. The size of the first sexual maturity in males and females is respectively 14 cm and 13.65 cm.