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Utilisation intégrée des escargots pour la surveillance de la contamination métallique des sols

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dc.contributor.author Belhiouani ép Seghir, Hadjer
dc.contributor.author Sahli, Leila
dc.contributor.author Afri-Mehennaoui, Fatima Zohra
dc.date.accessioned 2022-05-24T09:11:04Z
dc.date.available 2022-05-24T09:11:04Z
dc.date.issued 2019-12-17
dc.identifier.uri http://depot.umc.edu.dz/handle/123456789/4963
dc.description.abstract During the last century, Algeria experienced a period of rapid demographic, industrial, and agricultural expansion involving the irrational exploitation of many of its natural resources, and thus causing soil contamination and dysfunction. Among these contaminants that affect the soil: metallic trace elements, which are, ubiquitous, persistent in the environment, and extremely toxic at high levels. In order to monitor the metallic contamination of soils, and to assess their quality, this study is led. It consists of a mixed approach using terrestrial pulmonate gastropods, i.e., snails for bioindication purposes. Thus, five zones located in North-East Algeria, and characterized by relatively important anthropic activities (urban, industrial, mining, sub-mountainous and mountainous zones) are investigated. The studied TEs are Cd, Cr, Cu, Pb and Zn. The bioindicator snail studied is Cornu aspersum, and the studied vegetation is Drimia maritima. Firstly, the biodiversity and density of terrestrial gastropods are studied in these areas. We reported 3269 individuals, belonging to 19 species harvested during the spring and summer seasons. The density is more important in spring and the diversity is higher in summer. Then, the typology and the contents of TEs in the soils (pseudo-total and bioavailable fractions) is investigated. TEs are also quantified in the vegetation and, in the various parts of the snail C. apsersum (feet, viscera and shells). The mean TES concentrations of studied soils are: 3,04 µg.g-1 for Cd, 56,65 µg.g-1 for Cr, 30,87 µg.g-1 for Cu, 185,03 µg.g-1 for Pb and, 312,90 µg.g-1 for Zn. The most affected areas being the mining, industrial and urban areas. Single and integrated metal contamination indexes: Igeo, Cf, EF, Cd, PLI, and PERI confirm the soil contamination, especially with Cd, Pb and Zn. Mostly; the concentrations of TEs in snails were higher in the viscera than in the feet or the shells. Vegetation TEs concentrations did not generally exceed regulatory backgrounds. Bioconcentration factors calculated for C. aspersum confirm the importance of the digestive tract in the gastropod contamination process. Finally, the bioassays carried out under controlled conditions and implying the contamination of the substrate and the food with Pb on the juveniles of the species C. aspersum, show that there is a dose-response relation, which conditions the weight growth, but growth in diameter is not affected.
dc.language.iso fr
dc.publisher Université Frères Mentouri - Constantine 1
dc.subject Biologie et Ecologie Végétale: Ecologie et Environnement
dc.subject Gastéropodes pulmonés
dc.subject Biodiversité
dc.subject Éléments Trace Métalliques
dc.subject Sol
dc.subject Cornu aspersum
dc.subject Drimia maritima
dc.subject Bioessais
dc.subject Terrestrial Pulmonate Gastropods
dc.subject Biodiversity
dc.subject Metallic Trace Elements
dc.subject Soil
dc.subject Bioassay
dc.subject المعادن الضئيلة الكمية
dc.subject اختبارات حيوية
dc.subject التنوع البيولوجي القشريات الأرضية
dc.title Utilisation intégrée des escargots pour la surveillance de la contamination métallique des sols
dc.title.alternative approches chimique, biologique et écotoxicologique fr
dc.type Thesis

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