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Auteur Fatima Zohra Afri-Mehennaoui |
Documents disponibles écrits par cet auteur (7)
Affiner la recherche Interroger des sources externesEtude de l’évolution de la qualité écologique des eaux et inventaire de la micro flore aquatique du barrage de Béni-Haroun. / Saliha Kherief Nacereddine
Titre : Etude de l’évolution de la qualité écologique des eaux et inventaire de la micro flore aquatique du barrage de Béni-Haroun. Type de document : texte imprimé Auteurs : Saliha Kherief Nacereddine, Auteur ; Fatima Zohra Afri-Mehennaoui, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2019 Importance : 215 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
BiologieTags : Biologie et Ecologie Végétale: Ecologie Végétale Barrage Béni-Haroun Eléments nutritifs Phytoplancton Structure Dynamique Interaction Beni-Haroun Dam Nutrients Phytoplankton Dynamics سد بني هارون المغذيات العوالق النباتية البنية الديناميات التفاعل Index. décimale : 570 Sciences de la vie. Biologie Résumé :
Water, a vital element, is the subject of careful attention throughout the world. His importance for the preservation of public health has led to extensive programs of monitoring. The objectives of the control of the quality of water intended for consumption are many and vary according to the means and the technical possibilities. In this context, the main objective of this study is the constitute baseline for further study of phytoplankton. Biggest dam of Algeria for the feeding and irrigation of six wilayas in the East. We have sought to describe these stands, essentially from the point of view of structure, abundance and dynamics. Determination of the taxonomic composition of these primary producers improves, in fact, knowledge of the biodiversity of the entire region. Our interest has also focused on the characterization of surface water quality via fourteen parameters, the establishment of physico-chemical and phytoplankton typologies specific to our study site and looking for possible links between the two compartments abiotic and biotic. Our results are based on data collected for twenty-four months from January 2015 to December 2016;at the level of eleven sampling points in surface area around the Beni Haroun dam in connection with wadis feed. The results show nutrient levels that are not yet alarming, but the situation is likely to worsen with the different levels of pollution continues to grow. On the basis of 88 samples, 72 taxons were identified belonging to 9 phytoplankton classes. The total species richness has highlighted a broad predominance of Cyanophyceae and Bacillariophyceae. The evolution of
densities.Total cell counts show significant seasonal variations in 2016 more than in 2015. The rainy season is of low algal productivity while the highest cell densities mark the summer seasons and fall. The indices of Shannon and of equitability reach the lowest values in the rainy season, diversity early spring due to the development of several species of Cyanophyceae, Diatoms, Chlorophyceae, Conjugatophyceae and Mediophyceae. In summer and autumn season, communities are at their most diverse. Abiotic elements have shown positive and / or negative affinities with the amount of phytoplankton biomass.Note de contenu :
Annexes.
Diplôme : Doctorat en sciences En ligne : ../theses/biologie/KHE7524.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11364 Etude de l’évolution de la qualité écologique des eaux et inventaire de la micro flore aquatique du barrage de Béni-Haroun. [texte imprimé] / Saliha Kherief Nacereddine, Auteur ; Fatima Zohra Afri-Mehennaoui, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2019 . - 215 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
BiologieTags : Biologie et Ecologie Végétale: Ecologie Végétale Barrage Béni-Haroun Eléments nutritifs Phytoplancton Structure Dynamique Interaction Beni-Haroun Dam Nutrients Phytoplankton Dynamics سد بني هارون المغذيات العوالق النباتية البنية الديناميات التفاعل Index. décimale : 570 Sciences de la vie. Biologie Résumé :
Water, a vital element, is the subject of careful attention throughout the world. His importance for the preservation of public health has led to extensive programs of monitoring. The objectives of the control of the quality of water intended for consumption are many and vary according to the means and the technical possibilities. In this context, the main objective of this study is the constitute baseline for further study of phytoplankton. Biggest dam of Algeria for the feeding and irrigation of six wilayas in the East. We have sought to describe these stands, essentially from the point of view of structure, abundance and dynamics. Determination of the taxonomic composition of these primary producers improves, in fact, knowledge of the biodiversity of the entire region. Our interest has also focused on the characterization of surface water quality via fourteen parameters, the establishment of physico-chemical and phytoplankton typologies specific to our study site and looking for possible links between the two compartments abiotic and biotic. Our results are based on data collected for twenty-four months from January 2015 to December 2016;at the level of eleven sampling points in surface area around the Beni Haroun dam in connection with wadis feed. The results show nutrient levels that are not yet alarming, but the situation is likely to worsen with the different levels of pollution continues to grow. On the basis of 88 samples, 72 taxons were identified belonging to 9 phytoplankton classes. The total species richness has highlighted a broad predominance of Cyanophyceae and Bacillariophyceae. The evolution of
densities.Total cell counts show significant seasonal variations in 2016 more than in 2015. The rainy season is of low algal productivity while the highest cell densities mark the summer seasons and fall. The indices of Shannon and of equitability reach the lowest values in the rainy season, diversity early spring due to the development of several species of Cyanophyceae, Diatoms, Chlorophyceae, Conjugatophyceae and Mediophyceae. In summer and autumn season, communities are at their most diverse. Abiotic elements have shown positive and / or negative affinities with the amount of phytoplankton biomass.Note de contenu :
Annexes.
Diplôme : Doctorat en sciences En ligne : ../theses/biologie/KHE7524.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11364 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité KHE/7524 KHE/7524 Thèse Bibliothèque principale Thèses Disponible
Titre : Évaluation du risque de contamination des sédiments de l'oued Boumerzoug par les éléments traces métalliques sur la faune macroinvertébrée benthique et via la pertinence des bioindicateurs Spinacia oleracea (L.) et Physa acuta (D.) Type de document : texte imprimé Auteurs : Dounia Keddari, Auteur ; Fatima Zohra Afri-Mehennaoui, Directeur de thèse ; Leila Sahli, Directeur de thèse Mention d'édition : 08/03/2020 Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2020 Importance : 283 f. Format : 30 cm. Note générale : Doctorat 3éme CYCLE LMD.
1 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
BiologieTags : Biologie et Ecologie Végétale: Ecologie et Environnement Éléments Traces Métalliques Sédiment Contamination Biomonitoring Spinacia oleracea Physa acuta Faune macroinvertebrée benthique Oued Boumerzoug Trace metals Sediment التلوث الرواسب المعادن الثقيلة وادي بو مرزوق Index. décimale : 570 Sciences de la vie. Biologie Résumé : Our study is part of the deepening of our knowledge of a lotic ecosystem, the Boumerzeug wadi and its tributaries, which has been the subject of various complementary approaches to characterize its physico-chemical and biological quality The objective of this work is to assess the level of contamination of contamination of the abiotic and biotic compartments of the ecosystem by trace metals (TM) whose anthropogenic origin is added to the natural background levels. The samples were collected from 20 sites on five occasions spread over 15 months. Among the elements determined, some are essential to the physiological functions of organisms such as Cu, Cr, Ni, Ni, Zn, others are toxic such as Cd and Pb and finally Mn is a natural element without consequences on living beings. The TM measured in surface sediments follow the following sequence: MnZn > > Cu > Pb Ni>Co> Cd. The study of benthic macroinvertebrate fauna compartments highlights a faunal impoverishment following the disappearance of species sensitive to organic and/or metallic pollution, the method does not allow the nature of stress to be identified. The hydrobiological quality of the watercourse, expressed by the biotic index, reflects a situation of significant disturbance illustrated by the drop in values from upstream to downstream. The transfers of TM to the different parts, roots, leaves of Spinacia oleracea revealed that the chenopodiaceae concentrates and sequesters in its roots all TM except zinc, which has a higher content in the leaves. Thus, the roots seem to constitute a barrier that reduces the transfer of metal elements to the aerial part, while zinc, an essential metal, is translocated to the leaves. The hierarchy of average TM contents in spinach is as follows: Zn > Mn > Cu > Pb > Cr > Ni> Co>Cd. The transfer of TM to Physa or Physelle acuta lung gastropods in the various specimens, soft tissues and shells of P. acuta adults/juveniles) reflects the bioavailability of the element. The spatio-temporal data of TM contents in Physa acuta record the following order of abundance: MnZn > Cr> Cu > Ni>Pb > Co > Cd. All detected heavy metal concentrations were higher in soft tissue than in shell for adults and juveniles. There was a significant effect of the age (p < 0,001) on the concentrations of the eight metals, the adults of P. acut showing higher concentrations than juvenile. The biota-sediment accumulation factor (BSAF) of Cd in soft tissue was higher than 1, hence the usage of this species as a bio indicator for Cd pollution The present study provides data and information on the concentrations of 8 TM (Cd, Co, Cr, Cu, Mn, Ni, Pb, Zn) in the sediments of the Boumerzoug wadi and its tributaries and their transfer to plant and animal. It will provide a database and knowledge base that could provide new information for any future biomonitoring study of freshwater aquatic ecosystems.
Note de contenu : Annexes. Diplôme : Doctorat En ligne : ../theses/biologie/KED7637.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11471 Évaluation du risque de contamination des sédiments de l'oued Boumerzoug par les éléments traces métalliques sur la faune macroinvertébrée benthique et via la pertinence des bioindicateurs Spinacia oleracea (L.) et Physa acuta (D.) [texte imprimé] / Dounia Keddari, Auteur ; Fatima Zohra Afri-Mehennaoui, Directeur de thèse ; Leila Sahli, Directeur de thèse . - 08/03/2020 . - جامعة الإخوة منتوري قسنطينة, 2020 . - 283 f. ; 30 cm.
Doctorat 3éme CYCLE LMD.
1 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
BiologieTags : Biologie et Ecologie Végétale: Ecologie et Environnement Éléments Traces Métalliques Sédiment Contamination Biomonitoring Spinacia oleracea Physa acuta Faune macroinvertebrée benthique Oued Boumerzoug Trace metals Sediment التلوث الرواسب المعادن الثقيلة وادي بو مرزوق Index. décimale : 570 Sciences de la vie. Biologie Résumé : Our study is part of the deepening of our knowledge of a lotic ecosystem, the Boumerzeug wadi and its tributaries, which has been the subject of various complementary approaches to characterize its physico-chemical and biological quality The objective of this work is to assess the level of contamination of contamination of the abiotic and biotic compartments of the ecosystem by trace metals (TM) whose anthropogenic origin is added to the natural background levels. The samples were collected from 20 sites on five occasions spread over 15 months. Among the elements determined, some are essential to the physiological functions of organisms such as Cu, Cr, Ni, Ni, Zn, others are toxic such as Cd and Pb and finally Mn is a natural element without consequences on living beings. The TM measured in surface sediments follow the following sequence: MnZn > > Cu > Pb Ni>Co> Cd. The study of benthic macroinvertebrate fauna compartments highlights a faunal impoverishment following the disappearance of species sensitive to organic and/or metallic pollution, the method does not allow the nature of stress to be identified. The hydrobiological quality of the watercourse, expressed by the biotic index, reflects a situation of significant disturbance illustrated by the drop in values from upstream to downstream. The transfers of TM to the different parts, roots, leaves of Spinacia oleracea revealed that the chenopodiaceae concentrates and sequesters in its roots all TM except zinc, which has a higher content in the leaves. Thus, the roots seem to constitute a barrier that reduces the transfer of metal elements to the aerial part, while zinc, an essential metal, is translocated to the leaves. The hierarchy of average TM contents in spinach is as follows: Zn > Mn > Cu > Pb > Cr > Ni> Co>Cd. The transfer of TM to Physa or Physelle acuta lung gastropods in the various specimens, soft tissues and shells of P. acuta adults/juveniles) reflects the bioavailability of the element. The spatio-temporal data of TM contents in Physa acuta record the following order of abundance: MnZn > Cr> Cu > Ni>Pb > Co > Cd. All detected heavy metal concentrations were higher in soft tissue than in shell for adults and juveniles. There was a significant effect of the age (p < 0,001) on the concentrations of the eight metals, the adults of P. acut showing higher concentrations than juvenile. The biota-sediment accumulation factor (BSAF) of Cd in soft tissue was higher than 1, hence the usage of this species as a bio indicator for Cd pollution The present study provides data and information on the concentrations of 8 TM (Cd, Co, Cr, Cu, Mn, Ni, Pb, Zn) in the sediments of the Boumerzoug wadi and its tributaries and their transfer to plant and animal. It will provide a database and knowledge base that could provide new information for any future biomonitoring study of freshwater aquatic ecosystems.
Note de contenu : Annexes. Diplôme : Doctorat En ligne : ../theses/biologie/KED7637.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11471 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité KED/7637 KED/7637 Thèse Bibliothèque principale Thèses Disponible
Titre : Niveau de contamination par les ETM des sédiments du barrage Béni Haroun et des oueds qui l’alimentent : transfert vers la faune. Type de document : texte imprimé Auteurs : Hamssa Djeddi ép Bouatia, Auteur ; Fatima Zohra Afri-Mehennaoui, Directeur de thèse Mention d'édition : 21/08/2019 Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2019 Importance : 226 f. Format : 30 cm. Note générale : 1 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
BiologieTags : Biologie et Ecologie Végétale: Ecologie Végétale Eau Sédiment Eléments Traces Métalliques Poissons Macroinvertébrés Barrage Béni Haroun Oueds Water Sediments Heavy metal Fish Macroinvertebrates Béni Haroun Dam wadis الماء الرواسب المعادن الثقيلة الاسماك اللافقاريات سد بني هارون Index. décimale : 570 Sciences de la vie. Biologie Résumé :
The main goal of this PhD was to evaluate the impact of the anthropogenic activities (urban, industrial or agricultural activities) on aquatic ecosystemsin the northeastern region of Algeria. The evaluation focused on the Rhumel and Endja wadis, which drain urban, industrial and diffuse discharges and feed the Beni Haroun dam, the largest source of drinking water, irrigation and fishing in Algeria. In order to achieve our goal, this work was based on a multiple approach involving the terrain, with 6 campaigns of water and sediment sampling on 16 points spread over the wadis and reservoir lake, an analytical approach through physicochemical characterization of water and sediments, a biological and ecological approach by calculating biotic index via benthic macroinvertebrate fauna, and assessing the bioavailability of trace metals through metallic contamination of macroinvertebrates and four species of fish Cyrinus carpio, Abramis brama, Carassius carassius et Barbus callensis. The sediments of the Béni Haroun dam and wadis are slightly alkaline, have high conductivity and medium organic matter content.The spatio-temporal data of the pseudo-total levels of ETM in the sediments record the following order of abundance: Fe > Zn > Pb > Cu > Se. The concentrations are : 5920-33400 μg/g for Fe, 28,50-311,35μg/g for Zn, 2,30-115,35 μg/g for Pb, 2,25-41,25μg/g for Cu and ,02-2,69μg/g for Se. Indeed, the spatial distribution of heavy metals content reveals natural levels for Cu and Zn. Contamination by Fe, Se and Pb is widespread and affects all stations. This result has also been confirmed by the geoaccumulation index (Igeo) and the contamination factor (CF), which suggest that these high levels are essentially anthropogenic. The collected macroinvertebrates reveal polymetallic contaminations dominated by iron, zinc and lead. Similarly, the levels of the fish's TMs reflect contamination of the ichthyological fauna of the Beni Haroun dam. The levels determined in the muscles of the four fish species exceed the critical contamination values regardless of the metals studied, making them unfit for consumption as they pose a risk to human health.Note de contenu :
Annexes.Diplôme : Doctorat En ligne : ../theses/biologie/DJE7646.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11480 Niveau de contamination par les ETM des sédiments du barrage Béni Haroun et des oueds qui l’alimentent : transfert vers la faune. [texte imprimé] / Hamssa Djeddi ép Bouatia, Auteur ; Fatima Zohra Afri-Mehennaoui, Directeur de thèse . - 21/08/2019 . - جامعة الإخوة منتوري قسنطينة, 2019 . - 226 f. ; 30 cm.
1 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
BiologieTags : Biologie et Ecologie Végétale: Ecologie Végétale Eau Sédiment Eléments Traces Métalliques Poissons Macroinvertébrés Barrage Béni Haroun Oueds Water Sediments Heavy metal Fish Macroinvertebrates Béni Haroun Dam wadis الماء الرواسب المعادن الثقيلة الاسماك اللافقاريات سد بني هارون Index. décimale : 570 Sciences de la vie. Biologie Résumé :
The main goal of this PhD was to evaluate the impact of the anthropogenic activities (urban, industrial or agricultural activities) on aquatic ecosystemsin the northeastern region of Algeria. The evaluation focused on the Rhumel and Endja wadis, which drain urban, industrial and diffuse discharges and feed the Beni Haroun dam, the largest source of drinking water, irrigation and fishing in Algeria. In order to achieve our goal, this work was based on a multiple approach involving the terrain, with 6 campaigns of water and sediment sampling on 16 points spread over the wadis and reservoir lake, an analytical approach through physicochemical characterization of water and sediments, a biological and ecological approach by calculating biotic index via benthic macroinvertebrate fauna, and assessing the bioavailability of trace metals through metallic contamination of macroinvertebrates and four species of fish Cyrinus carpio, Abramis brama, Carassius carassius et Barbus callensis. The sediments of the Béni Haroun dam and wadis are slightly alkaline, have high conductivity and medium organic matter content.The spatio-temporal data of the pseudo-total levels of ETM in the sediments record the following order of abundance: Fe > Zn > Pb > Cu > Se. The concentrations are : 5920-33400 μg/g for Fe, 28,50-311,35μg/g for Zn, 2,30-115,35 μg/g for Pb, 2,25-41,25μg/g for Cu and ,02-2,69μg/g for Se. Indeed, the spatial distribution of heavy metals content reveals natural levels for Cu and Zn. Contamination by Fe, Se and Pb is widespread and affects all stations. This result has also been confirmed by the geoaccumulation index (Igeo) and the contamination factor (CF), which suggest that these high levels are essentially anthropogenic. The collected macroinvertebrates reveal polymetallic contaminations dominated by iron, zinc and lead. Similarly, the levels of the fish's TMs reflect contamination of the ichthyological fauna of the Beni Haroun dam. The levels determined in the muscles of the four fish species exceed the critical contamination values regardless of the metals studied, making them unfit for consumption as they pose a risk to human health.Note de contenu :
Annexes.Diplôme : Doctorat En ligne : ../theses/biologie/DJE7646.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11480 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité DJE/7646 DJE/7646 Thèse Bibliothèque principale Thèses Disponible
Titre : "Niveaux de contamination par les Eléments Traces Métalliques (Cd, Pb, Cu et Zn) de l’eau de production et des sédiments des champs pétroliers du complexe G.E.A – Hassi Messaoud" Type de document : texte imprimé Auteurs : Mohamed Mehdi Kechebar, Auteur ; Fatima Zohra Afri-Mehennaoui, Directeur de thèse Editeur : constantine [Algérie] : Université Constantine 1 Année de publication : 2014 Importance : 236 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
BiologieTags : Eau de production, éléments traces métalliques, analyse des risques, Noeud papillon
Produced water, Trace metals, risk analysis, BowTie
المياه المنتجة مع البترول- العناصر المعدنية- تحليل المخاطر- القوس المتعادلIndex. décimale : 570 Sciences de la vie. Biologie Résumé : "The actual work aims to provide management team with decision making tools in order to
implement continual improvement of the Environmental Management Plan compounds.
Development of those tools was carried out by environmental risks analysis related to
Trace Metals (Cd, Pb, Cu and Zn) within the actual produced water management practices
in GEA at Hassi Messaoud.
Trace metals concentrations measured in produced water and related sediments has
confirmed the hazard assumed at the beginning. Risk analysis was carried by “Bow Tie”
methodology and was performed on the identified Top Event.
Risk rating was carried, using the company Qualitative Risk Matrix, and has classified the
top event as High risk, which means that implementing proactive barriers becomes
mandatory.
Short and medium term actions were proposed and further risk analysis was recommended
for other events related to the hazard “Trace metals in produced water effluent”"
Diplôme : Magistère En ligne : ../theses/biologie/KEC6582.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=9693 "Niveaux de contamination par les Eléments Traces Métalliques (Cd, Pb, Cu et Zn) de l’eau de production et des sédiments des champs pétroliers du complexe G.E.A – Hassi Messaoud" [texte imprimé] / Mohamed Mehdi Kechebar, Auteur ; Fatima Zohra Afri-Mehennaoui, Directeur de thèse . - constantine [Algérie] : Université Constantine 1, 2014 . - 236 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
BiologieTags : Eau de production, éléments traces métalliques, analyse des risques, Noeud papillon
Produced water, Trace metals, risk analysis, BowTie
المياه المنتجة مع البترول- العناصر المعدنية- تحليل المخاطر- القوس المتعادلIndex. décimale : 570 Sciences de la vie. Biologie Résumé : "The actual work aims to provide management team with decision making tools in order to
implement continual improvement of the Environmental Management Plan compounds.
Development of those tools was carried out by environmental risks analysis related to
Trace Metals (Cd, Pb, Cu and Zn) within the actual produced water management practices
in GEA at Hassi Messaoud.
Trace metals concentrations measured in produced water and related sediments has
confirmed the hazard assumed at the beginning. Risk analysis was carried by “Bow Tie”
methodology and was performed on the identified Top Event.
Risk rating was carried, using the company Qualitative Risk Matrix, and has classified the
top event as High risk, which means that implementing proactive barriers becomes
mandatory.
Short and medium term actions were proposed and further risk analysis was recommended
for other events related to the hazard “Trace metals in produced water effluent”"
Diplôme : Magistère En ligne : ../theses/biologie/KEC6582.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=9693 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité KEC/6582 KEC/6582 Thèse Bibliothèque principale Thèses Disponible
Titre : Qualité écologique, niveau de contamination métallique du barrage Koudiet Medouar (Timgad) et transfert des ETM vers les produits de la pêche. Type de document : texte imprimé Auteurs : Imane Hamza ép Smattti, Auteur ; Fatima Zohra Afri-Mehennaoui, Directeur de thèse Mention d'édition : 17/12/2020 Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2020 Importance : 288 f. Format : 30 cm. Note générale : 1 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
BiologieTags : Biologie et Ecologie Végétale:Ecologie et Environnement Ecologie et Environnement : Ecotoxicologie sédiment éléments traces métalliques macroinvertébrés poissons barrage de Koudiet Medouar Oued Rebaa sediment trace metals macroinvertebrates fish Koudiet Medouar dam wadi Rebaa الرواسب المعادن
الثقيلة اللافقاريات الأسماك سد كودييت المدور واد رباعIndex. décimale : 570 Sciences de la vie. Biologie Résumé :
Trace metals (TM) are ubiquitous contaminants of the aquatic environments, resulting directly or indirectly from the chemical alteration and mechanical erosion of source rocks, to which are added another origins anthropogenic such as: agricultural, industrial and domestic. TM can accumulate in the sedimentary compartment in dissolved or especially in particulate form, a veritable well for pollutants, they contaminate the plant and animal organisms living in the environment. The lack of data on the ecological health of the Koudiet Medouar dam has motivated our interest in its investigation. The aim of this study is to assess the level of recent contamination by trace metal elements of the surface sediments of the KM dam and its main tributary Oued Rebaa, and their transfer to fishery products, as well as the hydrobiological quality of this ecosystem. This study is carried out on 9 stations, 6 of which are selected from upstream to downstream of Oued Rebaa and 3 at the KM dam. Eight sampling campaigns covering in situ physical measurements of water, sediment sampling, macroinvertebrate and fish were carried out over 2 years from September 2012 to July 2014. The analytical approach concerned the physicochemical characterization of sediments (water content, organic matter, pHs, electrical conductivity and total limestone, determined on the fraction less than 2 mm) and their contents of 8 TMEs (Cd, Co, Cr, Cu, Mn, Ni, Pb and Zn on the fraction less than 63μm) determined by Flame Atomic Absorption Spectrophotometry. The transfer of TM was determined in the gills, liver and muscles of 4 fish species, Hypophthalmichthys molitrix, Cyprinus carpio, Barbus sitifensis and Alburnus alburnus. The biological approach focused on the biodiversity of the benthic macroinvertebrate and the calculation of the biotic index (BI) reflecting the ecological quality of the environment. The sediments of the KM dam and wadi Rebaa, which are slightly alkaline, are characterized by high electrical conductivity, medium organic matter and high carbonate load. The pseudo-total concentrations of TM in the sediments show the following order of abundance: Mn > Zn > Cr > Cu > Co > Pb > Ni > Cd. The spatial and temporal distribution of TMs shows natural background levels of Co, Pb, Ni and Mn. Contamination by Cd, Cr, Cu and Zn is highlighted and affects all stations. The geoaccumulation index (Igeo), contamination factor (CF), pollution load index (PLI), sediment pollution index (SPI) and degree of contamination (Dc) reveal polymetallic contamination dominated by two or more elements at stations where fish swim through the dam; Cd, Cr, Cu and Zn being of greatest concern. The same results are confirmed by the ecological risk factor (Re), the ecological risk index (IR) and the toxicity criteria (TEC: Threshold Effect Concentration and PEC: Probable Effect Concentration) which show that Cd, Cr, Cu and Zn are the elements concerned by frequent and/or occasional effects on benthic fauna. The hydrobiological quality of wadi Rebaa and the KM dam, expressed by the Biotic Index, reflects a remarkable disturbance situation, illustrated by an impoverishment of the faunal biodiversity and the reduction of the IB from 10/10 to 2/10 from upstream to downstream. The quality of the fishery products is assessed through the level of contamination of the fish fauna of the Koudiet Medouar dam. The hierarchy of mean TM levels in Hypophthalmichthys molitrix, Cyprinus carpio, and Alburnus alburnus follow the following sequence: Zn˃ Mn˃ Cr˃ Cu˃ Pb˃ Co˃ Ni˃ Cd. While Barbus sitifensis, the order of abundance is as follows: Zn˃ Mn˃ Cr˃ Cu˃ Co˃ Pb˃ Ni˃ Cd. Levels determined in the gills of C. caprio and H. molitrix exceed critical values for Zn contamination, whereas the liver of C. caprio and B. setifensis accumulates Cd. The critical values for Cd in the muscle of A. alburnus and the risk it poses to human health make it unfit for consumption. The level of accumulation of Cd increases with the age and size of the fish.
Note de contenu :
Annexes.Diplôme : Doctorat en sciences En ligne : ../theses/biologie/HAM7699.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11533 Qualité écologique, niveau de contamination métallique du barrage Koudiet Medouar (Timgad) et transfert des ETM vers les produits de la pêche. [texte imprimé] / Imane Hamza ép Smattti, Auteur ; Fatima Zohra Afri-Mehennaoui, Directeur de thèse . - 17/12/2020 . - جامعة الإخوة منتوري قسنطينة, 2020 . - 288 f. ; 30 cm.
1 copies imprimées disponibles
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BiologieTags : Biologie et Ecologie Végétale:Ecologie et Environnement Ecologie et Environnement : Ecotoxicologie sédiment éléments traces métalliques macroinvertébrés poissons barrage de Koudiet Medouar Oued Rebaa sediment trace metals macroinvertebrates fish Koudiet Medouar dam wadi Rebaa الرواسب المعادن
الثقيلة اللافقاريات الأسماك سد كودييت المدور واد رباعIndex. décimale : 570 Sciences de la vie. Biologie Résumé :
Trace metals (TM) are ubiquitous contaminants of the aquatic environments, resulting directly or indirectly from the chemical alteration and mechanical erosion of source rocks, to which are added another origins anthropogenic such as: agricultural, industrial and domestic. TM can accumulate in the sedimentary compartment in dissolved or especially in particulate form, a veritable well for pollutants, they contaminate the plant and animal organisms living in the environment. The lack of data on the ecological health of the Koudiet Medouar dam has motivated our interest in its investigation. The aim of this study is to assess the level of recent contamination by trace metal elements of the surface sediments of the KM dam and its main tributary Oued Rebaa, and their transfer to fishery products, as well as the hydrobiological quality of this ecosystem. This study is carried out on 9 stations, 6 of which are selected from upstream to downstream of Oued Rebaa and 3 at the KM dam. Eight sampling campaigns covering in situ physical measurements of water, sediment sampling, macroinvertebrate and fish were carried out over 2 years from September 2012 to July 2014. The analytical approach concerned the physicochemical characterization of sediments (water content, organic matter, pHs, electrical conductivity and total limestone, determined on the fraction less than 2 mm) and their contents of 8 TMEs (Cd, Co, Cr, Cu, Mn, Ni, Pb and Zn on the fraction less than 63μm) determined by Flame Atomic Absorption Spectrophotometry. The transfer of TM was determined in the gills, liver and muscles of 4 fish species, Hypophthalmichthys molitrix, Cyprinus carpio, Barbus sitifensis and Alburnus alburnus. The biological approach focused on the biodiversity of the benthic macroinvertebrate and the calculation of the biotic index (BI) reflecting the ecological quality of the environment. The sediments of the KM dam and wadi Rebaa, which are slightly alkaline, are characterized by high electrical conductivity, medium organic matter and high carbonate load. The pseudo-total concentrations of TM in the sediments show the following order of abundance: Mn > Zn > Cr > Cu > Co > Pb > Ni > Cd. The spatial and temporal distribution of TMs shows natural background levels of Co, Pb, Ni and Mn. Contamination by Cd, Cr, Cu and Zn is highlighted and affects all stations. The geoaccumulation index (Igeo), contamination factor (CF), pollution load index (PLI), sediment pollution index (SPI) and degree of contamination (Dc) reveal polymetallic contamination dominated by two or more elements at stations where fish swim through the dam; Cd, Cr, Cu and Zn being of greatest concern. The same results are confirmed by the ecological risk factor (Re), the ecological risk index (IR) and the toxicity criteria (TEC: Threshold Effect Concentration and PEC: Probable Effect Concentration) which show that Cd, Cr, Cu and Zn are the elements concerned by frequent and/or occasional effects on benthic fauna. The hydrobiological quality of wadi Rebaa and the KM dam, expressed by the Biotic Index, reflects a remarkable disturbance situation, illustrated by an impoverishment of the faunal biodiversity and the reduction of the IB from 10/10 to 2/10 from upstream to downstream. The quality of the fishery products is assessed through the level of contamination of the fish fauna of the Koudiet Medouar dam. The hierarchy of mean TM levels in Hypophthalmichthys molitrix, Cyprinus carpio, and Alburnus alburnus follow the following sequence: Zn˃ Mn˃ Cr˃ Cu˃ Pb˃ Co˃ Ni˃ Cd. While Barbus sitifensis, the order of abundance is as follows: Zn˃ Mn˃ Cr˃ Cu˃ Co˃ Pb˃ Ni˃ Cd. Levels determined in the gills of C. caprio and H. molitrix exceed critical values for Zn contamination, whereas the liver of C. caprio and B. setifensis accumulates Cd. The critical values for Cd in the muscle of A. alburnus and the risk it poses to human health make it unfit for consumption. The level of accumulation of Cd increases with the age and size of the fish.
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Code-barres Cote Support Localisation Section Disponibilité HAM/7699 HAM/7699 Thèse Bibliothèque principale Thèses Disponible
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