Browsing by Author "ALI ELAFRI"

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    LAND APPLICATION OF SEWAGE SLUDGE: PHYSIOLOGICAL AND BIOCHEMICAL RESPONSE OF THE RIO GRANDE TOMATO
    (journal of bioresource management, 2020) ALI ELAFRI; Ismahan Halassi
    Treated wastewater produces sewage sludge as a by-product that may have beneficial implications on agricultural practices. The effects of sludge amendments on growth, morphological and biochemical characteristics of the agro-industrial Tomato cultivar Rio Grande were observed. A pot culture experiment was carried out during 4 months (16 February 2019 to 18 June 2019), at an experimental green house in the locality of Salah Soufi, Guelma, north-eastern Algeria. There were significant differences between soil and sewage sludge samples. Total nitrogen (20.58 mg/kg) was more available in sewage sludge than in soil (N = 2.09 ± 0.3 mg/kg). In contrast, sludge contained less phosphorus and organic matter than soil. The observation of the morphological characteristics of the plants showed significant variations between the treatments. The germination rates for treated soils decreased significantly to reach 50%, compared to the control. Growth patterns (dry and fresh weight of leaves and roots) changed significantly (P <0.05) between the treatments. Chlorophyll contents of plants in treated soils were more than twice as high as those of the control, but started decreasing at 75% amendment rates.
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    PHENOTYPIC PLASTICITY AND PARENTAL EFFECT ON REARING OF TWO DIVERSE HABITAT ENVIRONMENT FOR LABORATORY REARED SYMPETRUM MERIDIONALE
    (Journal of Bioresource Management, 2021-05-26) ALI ELAFRI; Ismahan Halassi
    Laboratory observations on rearing experiment of Odonata serve to answer many evolutionary and ecological questions. In order to evidences the role of species parental habitat provenience in the development behaviour of their offspring, we surveyed several life history traits of two rearing populations of Sympetrum meridionale (Anisoptera: Sympetrinae), coming from two different habitats across north-eastern Algeria. The first one is a RAMSAR wetland called ‘Mekhada’ (a perennial water body), and the second one is a temporary pond located at “Maouna” Mountain (1400 m altitude). Overall, the development patterns of the two populations of dragonflies vary with the type of habitat the parental generation of the species occupy (Factorial ANCOVA: all p < 0.05). Firstly, egg mortality was very low in dragonfly population inhabiting the RAMSAR wetland compared of those belonging to Maouna Mountain. Secondly new-borne larvae stemming from females inhabiting the Mekhada wetland develop more slowly than did those coming from the “Maouna” Mountain pond. Finally, larvae of Sympetrum meridionale stemming from females inhabiting the temporary wetland were heavier than those inhabiting the perennial wetland. Such studies will ads considerably to our understanding of the mechanisms that are responsible for possible effects of environmental changes on life history traits of dragonflies across the southern part of their distribution range.
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    Traditional Orchards and Drivers of Reproductive Performance in a Northern Algerian Population of Laughing Doves (Spilopelia senegalensis)
    (J. BIOL. ENVIRON. SCI.,, 2020-06-26) ALI ELAFRI; Ismahan Halassi
    As a good example of species which have adapted in specific anthropogenic habitats as traditional orchards, we studied the breeding ecology of a northern Algerian population of Laughing Doves. We built multifactorial models for three components of Laughing Dove reproductive performance *clutch size, number of hatchlings, and number of fledglings* using generalized linear models (GLM). None of the studied factors: orchard type, laying period, nest location or nest size was affecting clutch size. Number of chicks hatched per nest was affected by orchards type and laying period. Based on model averaged estimates, the hatching success of Laughing Dove was negatively related to “olive orchards and early timing of breeding” ( β = −0.53; z = −2.16; p = 0.3). Whereas the number of chicks fledged per nest only differed with orchard type, and model averaged estimates showed a negative relation to olive orchards (β = −0.30 ± 0.17; z = −1.72, p = 0.28). No other variables, horizontal and vertical location or nest size, were related to the variation in breeding performance. So, we suggest that the main drivers of nest failures and reproductive performance of Laughing Doves were egg predation and other variables which are not investigated.