Publications of Khadija Sossey Alaoui
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See detailDistribution Pattern of Macrophytic Community and Water Quality Indicators in Walloon Rivers
Sossey Alaoui, Khadija ULiege; Rosillon, Francis ULiege

in Him, Lal Shrestha (Ed.) International Research in Environment, Geography and Earth Science Vol. 4 (2020)

The objectives of this study were to describe the distribution of macrophyte assemblages in relation to physico‐chemical parameters of their environment and to assess the variability in ecological metrics ... [more ▼]

The objectives of this study were to describe the distribution of macrophyte assemblages in relation to physico‐chemical parameters of their environment and to assess the variability in ecological metrics throughout the Walloon river network. Two-way clustering allowed us to simultaneously assign sample units and species to groups by performing two separate cluster analyses. Indicator species analysis allowed us to assess the degree to which a species indicated a group, based on its constancy and distribution of abundance. Hygroamblystegium fluviatile, Chiloscyphus polyanthos and Lemanea fluviatilis were found to characterize acidic and low impacted streams and rivers (G1), while Ranunculus fluitans was found in all low impacted large streams (G2). Potamogeton pectinatus, proved to be more common in eutrophicated waters in the calcareous areas particularly in the ʺLoess low plateauxʺ region (G6). Cinclidotus riparius, Fissidens crassipes and Pellia endiviifolia, appeared in rivers situated in the Condroz region (G4), which was characterized by a high concentration of nitrogen. [less ▲]

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See detailInternational Research in Environment, Geography and Earth Science Vol.1
Sossey Alaoui, Khadija ULiege; Tychon, Bernard ULiege; Rosillon, Francis ULiege

in Sossey Alaoui, Khadija (Ed.) International Research in Environment, Geography and Earth Science Vol.1 (2020)

This book covers all areas of Geography, Environment and Earth Science. The scope of the book is outlined below. Geography related book chapters are expected to cover: Cartography‎, Human geography‎ ... [more ▼]

This book covers all areas of Geography, Environment and Earth Science. The scope of the book is outlined below. Geography related book chapters are expected to cover: Cartography‎, Human geography‎, Physical geography‎, Political geography‎, Regional geography, Animal geography, etc. Environmental science related book chapters are expected to cover: Interdisciplinary research that integrates physical, biological and information sciences (including ecology, biology, physics, chemistry, plant science, zoology, mineralogy, oceanography, limnology, soil science, geology and physical geography, and atmospheric science) to the study of the environment, and the solution of environmental problems. Earth science related book chapters are expected to cover: Research and study of all fields of natural science related to the planet Earth, dealing with the physical constitution of the Earth and its atmosphere. This book contains various materials suitable for students, researchers and academicians and expected to be very useful. [less ▲]

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See detailLE PEUPLEMENT BIOLOGIQUE DANS LES ÉCOSYSTÈMES AQUATIQUES FACE AUX POLLUANTS ÉMERGENTS : MENACES ET RISQUES
Sossey Alaoui, Khadija ULiege; Tychon, Bernard ULiege

Scientific conference (2018, October 22)

Le projet DIADeM a organisé le 22 octobre 2018 un séminaire au Campus d'Arlon de l'Université de Liège en Belgique. Le Séminaire est organisé par les acteurs scientifiques de l’Uliège, Campus d’Arlon en ... [more ▼]

Le projet DIADeM a organisé le 22 octobre 2018 un séminaire au Campus d'Arlon de l'Université de Liège en Belgique. Le Séminaire est organisé par les acteurs scientifiques de l’Uliège, Campus d’Arlon en collaboration avec les partenaires du projet DIADEM afin de mettre l’accent sur la menace et le danger que les écosystèmes et la biodiversité encourent face aux polluants émergents. Il vise également à mettre en évidence les outils développés pour améliorer le diagnostic des écosystèmes aquatiques. Les déchets ménagers, les hôpitaux, les animaux d’élevage sont des sources importantes de rejets médicamenteux et peuvent polluer les sols et les eaux. Partiellement éliminés par les stations d’épurations, ces résidus pharmaceutiques se retrouvent sur les sols, dans les eaux superficielles et dans les eaux souterraines. Une fois dans l'environnement, elles peuvent contaminer les organismes vivants et potentiellement les affecter. [less ▲]

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See detailEffects of a mixture of pharmaceuticals in a freshwater model ecosystem
Joachim, Sandrine; David, Viviane; Nott, Katherine et al

Poster (2018, May)

Owing to their ecological importance, freshwaters provide important services which leads to a strong societal demand concerning the preservation of their quality. They are the receptors of many ... [more ▼]

Owing to their ecological importance, freshwaters provide important services which leads to a strong societal demand concerning the preservation of their quality. They are the receptors of many contaminants emitted by human activities and more specifically by wastewater treatment plants effluents. Water resources of the Meuse watershed are used on both sides of the French-Belgian border which involves a coherent and joint management. In that framework, the DIADeM project suggests developing and spreading out a cross-border multidisciplinary approach to improve the diagnosis and the chemical and biological (biomarkers) monitoring of freshwaters using the Meuse river as a case study. In the past, results from chemical surface water monitoring of the Meuse has revealed the occurrence of numerous substances and more particularly pharmaceuticals. Overall, the project suggests coupling chemical and biomarkers analysis on caged organisms (a crustacean, a mollusk, a moss and a fish species) with predictive mathematical population level models. In order to calibrate and validate these models, a lotic mesocosm experiment was set up. Five substances were chosen: diclofenac, carbamazepine, naproxen, paracetamol and irbesartan. An environmental realistic mixture M of the five substances was tested along with MX10 and MX100. The study was carried out in twelve 20 m long lotic channels. The mesocosms were set up with artificial sediments, macrophytes, periphyton, benthic and pelagic invertebrates, decomposers and one fish species (Gasterosteus aculeatus), zebra mussels, Fontinalis antipyretica and Gammarus fossarum were also caged in the mesocosms. After 3 months of stabilization, treatment lasted 5 months. Periphyton biomass, macrophyte biovolume, zebra mussel biomarkers and growth, G. fossarum survival, reproduction and growth, F. antipyretica biomarkers and growth, zooplankton and invertebrate abundance and diversity, and fish individual physiological responses along with population dynamics were the main measured biological endpoints. The concentrations of each substance in water was monitored monthly along with some physico-chemical parameters. The overall experimental design will be presented along with the results related to the monitoring of substance concentrations in water, physico-chemical parameters, macrophyte biovolume, invertebrate community response, fish larvae densities. A brief discussion of the direct and/or indirect effects will then be performed. [less ▲]

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See detailUliège. Implication dans le projet DIADeM
Sossey Alaoui, Khadija ULiege

Scientific conference (2018, February 22)

Le jeudi 22 février 2018, le CER GROUPE a accueilli, au sein de leurs locaux, une quarantaine de membres du Comité de suivi du programme INTERREG FWVL pour une visite de terrain. Le projet DIADeM a été ... [more ▼]

Le jeudi 22 février 2018, le CER GROUPE a accueilli, au sein de leurs locaux, une quarantaine de membres du Comité de suivi du programme INTERREG FWVL pour une visite de terrain. Le projet DIADeM a été retenu pour son mode de gestion collaboratif original, associant, pour chaque module de travail, deux partenaires français et wallon. Cette journée a commencé par une présentation vulgarisée du projet par Alain GEFFARD, coordinateur scientifique de DIADeM. Elle s'est ensuite poursuivie par la projection de la capsule vidéo 2, réalisée par l'UNamur. Puis se sont succédées Khadija Sossey (ULiège), Katherine Nott (SWDE) et Christelle Robert (CER GROUPE) à la présentation de leurs activités et recherches menées dans le cadre du projet. Enfin, les membres du Comité ont visité les laboratoires du CER GROUPE. Cette journée a été organisée avec succès par le CER GROUPE. [less ▲]

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See detailTrend analysis in ecological status and macrophytic characterization of watercourses: case of the Semois-Chiers basin, Belgium Wallonia
Sossey Alaoui, Khadija ULiege; Rosillon, Francis ULiege; Tychon, Bernard ULiege

in Journal of Water Resource and Protection (2015), Vol.7 No.13 2015

In order to analyze the distribution and evolution of the aquatic vegetation and ecological status of the Semois-Chiers basin (Semois sub-basin and Chiers sub-basin), macrophyte surveys were conducted at ... [more ▼]

In order to analyze the distribution and evolution of the aquatic vegetation and ecological status of the Semois-Chiers basin (Semois sub-basin and Chiers sub-basin), macrophyte surveys were conducted at 48 sites in 2007 and 2013. Environmental parameters were also measured in order to characterize the waterbodies in terms of physico-chemical properties and anthropogenic pressure. The two-way clustering and indicator value (INDVAL) methods were used to assess groups of sites according to their macrophytic composition and species communities. The results showed a clear difference between streams in the Lorraine area (calcareous watercourses) and in the Ardennes (siliceous). Within each natural region, those with natural vegetation of high ecological status were separated from those dominated by resistant species. The Macrophytical Biological Index for Rivers (IBMR), was calculated for the sites visited in 2010 and 2013 and the results show a trend towards an increase of IBMR values of polluted sites. For the latter, the Wilcoxon test was performed to assess the significance of the difference in quality between 2010 and 2013. This showed a statistically significant difference (p-value= 0.035). Our results showed similarities with previous data, as well as some differences. The differences observed might indicate a gradual change in the composition of the vegetation in the study area, caused by changes in environmental conditions. They could also reflect a lack of information about the ecology of certain groups of plants, mainly bryophytes and macroalgae that were not considered in previous studies. Despite the measures implemented under the EU’s Water Framework Directive (WFD), the current vegetation of the Semois river differs little from that observed in 1996. There is a slight improvement in the headwaters of a Semois river, described in previous studies as polytrophic and devoid of vegetation, with the appearance of macrophytic species. In some parts of the Chiers sub-basin, however, resistant species observed in 1999 persist. [less ▲]

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See detailVégetation aquatique et supra-aquatique des cours d'eau luxembourgeois
Sossey Alaoui, Khadija ULiege

Book published by PRESSES ACADÉMIQUES FRANCOPHONES (2015)

La répartition des Macrophytes aquatiques (Phanérogames et Bryophytes) a été étudiée sur l’ensemble des cours d’eau luxembourgeois. Des prospections macrophytiques ont été réalisées pour 340 stations ... [more ▼]

La répartition des Macrophytes aquatiques (Phanérogames et Bryophytes) a été étudiée sur l’ensemble des cours d’eau luxembourgeois. Des prospections macrophytiques ont été réalisées pour 340 stations entre 2000 et 2003. Dans chacune d’entre elles, des paramètres mésologiques ont été mesurés et des analyses physico-chimiques des eaux ont été effectuées dans 63% des stations. La relation macrophytes-habitat a été envisagée selon deux approches : multidimensionnelle d’une part et par des profils écologiques d’autre part. Les principales espèces aquatiques et semi-aquatiques des rivières luxembourgeoises ont été classées en différents groupes par une Analyse Factorielle Multiple (AFM) sur base des descripteurs physico-chimiques et morpho-métriques impliqués dans la dispersion, l’établissement et la persistance des espèces aquatiques. Basée sur l’abondance de ces groupements, une typologie floristique des cours d’eau a conduit à l’individualisation de différents groupes de stations : 1 les têtes de bassins ardennais caractérisées par Chiloscyphus pallescens et C. polyanthos ainsi que par un éclairement faible et un substrat grossier ; 2 les cours principaux de l’Oesling à Ranunculus penicillatus, R. peltatus ; 3 Berula erecta et Veronica beccabunga caractérisent les zones amonts du Gutland dont les eaux montrent des teneurs élevées en nitrates ; 4 les cours principaux lorrains dont les eaux sont plus minéralisés et riches en SO42- sont caractérisés par P. crispus, E. canadensis, P. natans et Z. palustris ; 5 et finalement les zones fortement eutrophisées (rithrons) caractérisées par un grand nombre d’espèces (Potamogeton pectinatus, P. perfoliatus, Sparganium emersum….) et par des critères morpho-métriques très importants (profondeur, éclairement, largeur et température). Des profils écologiques et des cartes de distributions des principales espèces rencontrées (Phanérogames et Bryophytes) nous ont permis de délimiter leurs comportements vis a vis de l’eutrophisation et de la minéralisation. Les différences observées par rapport à la littérature témoignent d’une prolifération des espèces polluo-tolérantes d’une part et d’une pression anthropique importante le long du réseau hydrographique luxembourgeois d’autre part. Une méthode indicielle a été appliquée afin d’évaluer la qualité des rivières sur base des espèces inventoriées. Néanmoins, la faible occurrence des espèces et la non prise en compte des algues ont diminué l’acuité de la méthode. L’importance des formations végétales riveraines au sein des écosystèmes aquatiques et plus particulièrement dans le domaine de la bioindication a été étudiée également. Le pouvoir bioindicateur pour les facteurs acidité, azote, humidité, et lumière (ELLENBERG et al., 1992) a été précisé pour 220 espèces rivulaires inventoriées le long des sites de l’Oesling et du Gutland. Une typologie des biotopes riverains a été dégagée sur base de ces valeurs bioindicatrices. Le déterminisme de la richesse des sols riverains a été envisagé dans sa composante naturelle Oesling-Gutland, ainsi que dans sa composante anthropique. [less ▲]

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See detailContribution to the Macrophytic Typology of Belgian Reference Watercourses
Galoux, Daniel; Cherot, Frédéric; Rosillon, Francis ULiege et al

in Advances in Botany (2015), Volume 2015, Article ID 651369

The objective of the study is to create a typology of macrophytes for the reference watercourses of the Meuse River catchment ... [more ▼]

The objective of the study is to create a typology of macrophytes for the reference watercourses of the Meuse River catchment basininWalloniaasasteptowardstheimplementationoftheEuropeanWaterFrameworkDirective.The50sitesstudiedarethe objectofaphysicochemicalandenvironmentalcharacterizationfollowedbyafloristicsurvey(phanerogams,mosses,liverworts, andmacroalgae).Sixclustersofwatercourseswiththeircharacteristicspeciesarehighlightedbytwo-wayclusteringandindicator species. The abundance of phanerogams in some watercourses of the Arden region is not only linked to light intensity but also dependsonthedegreeofslopeandthenatureofthegeologicalsubstrate [less ▲]

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See detailMacrophytes: Limitations of Using Them to Assess Reservoir Status According to the Water Framework Directive
Sossey Alaoui, Khadija ULiege; Galoux, Daniel; Rosillon, Francis ULiege

in International Journal of Water Sciences (2013)

Macrophytes are among the major groups of organisms that the Water Framework Directive (WFD) recommends should be used in assessing the status of natural lakes. The use of macrophytes in reservoir ... [more ▼]

Macrophytes are among the major groups of organisms that the Water Framework Directive (WFD) recommends should be used in assessing the status of natural lakes. The use of macrophytes in reservoir monitoring is still limited and further studies are needed on their inter-calibration and sources of variation. Many status assessment methods based on macrophyte communities have been defined for lakes. Nevertheless, few of them have been tested for reservoirs. The purpose of the study is to highlight the limitations of using macrophytes to assess reservoir status according to the Water Framework Directive. An assessment of macrophyte composition and abundance and of water quality was carried out in nine Walloon reservoirs between 2010 and 2012. The main limitations of the macrophyte approach for assessing these reservoirs were: i) geographical features; ii) physical variables; iii) lack of ecological information on the various macrophytic groups, such as helophytes, algae and mosses. We used two assessment methods to test the relevance of using macrophyte communities to assess reservoir status: the Flanders (Belgium) method (BE-FL method) and the United Kingdom method (UK method). The relationships between macrophyte metrics for both methods and nutrient enrichment were examined. Highly significant correlations were found between the chemical variables O-P [mg P/l]), Total P (µg P/l), Conductivity (µS/cm) and the trophic UK-metric (Lake Macrophyte Nutrient) (LMNI), as well as between such variables and the abundance of Bl-FL "disturbance indicators" metric(V). The UK "group of macrophyte species" metric provided limited information on the quality or degrees of degradation in the environment from which the sample was taken. [less ▲]

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See detailMacrophytes : limitations of using them to assess reservoir status according to the water framework directive
Sossey Alaoui, Khadija ULiege; Rosillon, Francis ULiege

Conference (2013, July)

Macrophytes are among the major groups of organisms that the Water Framework Directive (WFD) recommends should be used in assessing the status of reservoirs. The use of macrophytes in reservoir monitoring ... [more ▼]

Macrophytes are among the major groups of organisms that the Water Framework Directive (WFD) recommends should be used in assessing the status of reservoirs. The use of macrophytes in reservoir monitoring is still fairly limited and studies are needed on their inter-calibration and sources of variation. Many status assessment methods based on macrophyte communities have been defined for lakes, Nevertheless few of them have been tested for reservoirs. The purpose of the study is to highlight the limitations of using macrophytes to assess reservoir status according to the Water Framework Directive. An assessment of macrophyte composition and abundance and of water quality was carried out in seven Walloon reservoirs between 2010 and 2012. The main limitations of the macrophyte approach for assessing these reservoirs were: i) geographical features, ii) physical variables, iii) water chemistry and iiii) lack of ecological information on the various macrophytic groups, such as helophytes, algae and mosses. Few of the taxa occurring in the Walloon reservoirs have an indicator score for status assessment based on macrophyte communities. We used two assessment methods to test the relevance of using macrophyte communities to assess reservoir status: the Flanders (Belgium) method (BE-FL method) and the United Kingdom method (UK-method). The relationships between macrophyte metrics for both methods and nutrient enrichment were examined. Highly significant correlations were found between the chemical variables (O-P [mg P/l]); P tot (μg P/l); total hardness (°F), conductivity (μS/cm) and the trophic UK-metric (LMNI); and between it and the abundance of ‘Bl-FL disturbance indicators’ metric (V). The ‘UK group of macrophyte species’ metric does not provide direct information on the quality or degree of degradation of the environment from which the sample was taken. [less ▲]

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See detailLes macrophytes dans les ruisseaux de référence wallons: caractérisation des sites et typologie floristique
Sossey Alaoui, Khadija ULiege; Galoux, Daniel; Rosillon, Francis ULiege

in Colloque international des Macrophytyes: IRSTEA, Bordeaux 28-30 mai 2013 (2013, May 30)

La Directive européenne cadre 2000/60/CE sur l’eau a pour objectif l’atteinte du bon état écologique et du bon état chimique au sein des bassins hydrographiques, d'ici 2015. Pour établir l’état écologique ... [more ▼]

La Directive européenne cadre 2000/60/CE sur l’eau a pour objectif l’atteinte du bon état écologique et du bon état chimique au sein des bassins hydrographiques, d'ici 2015. Pour établir l’état écologique, la Directive impose de mesurer l’écart à la référence pour les indicateurs de la qualité biologique des cours d’eau (macroinvertébrés, diatomées, poissons, macrophytes et phytoplancton). L’élaboration d’une typologie macrophytique des ruisseaux de référence du bassin hydrographique de la Meuse, en Wallonie est l’objectif de l’étude. Les 50 sites étudiés font l’objet d’une caractérisation physico-chimique et mésologique et ensuite de relevés de végétation. Ceux-ci sont effectués sur des segments de cours d’eau de 100m de long et le recouvrement de chaque espèce est estimé selon une échelle d’abondance. Les ruisseaux étudiés peuvent être considérés comme le résultat d’un inventaire quasi exhaustif pour la Wallonie. Les plantes supérieures (hydrophytes), les mousses, les hépatiques, les macroalgues sont identifiées sur le terrain et au laboratoire à l’aide du binoculaire et du microscope. Le degré de la pente, l’altitude de la source et du site, l’occupation du sol, la géologie et certaines caractéristiques physico-chimiques de l’eau (ph, conductivité, teneur en calcium, magnésium et alcalinité) permettent de caractériser les stations. Six ensembles de ruisseaux avec leurs espèces caractéristiques sont mis en évidence par le "Two-Way Clustering" et "l’Indicator Species". L'analyse du déterminisme de distribution de la végétation dans les différents ensembles montre que ces derniers sont étroitement liés aux régions naturelles et leur typologie s’inscrit dans la typologie physique choisie par le Service public de Wallonie. [less ▲]

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See detailMacrophytic Distribution and Trophic State of Some Natural and Impacted Watercourses - Belgium Wallonia
Sossey Alaoui, Khadija ULiege; Rosillon, Francis ULiege

in International Journal of Water Sciences (2013), 2(3), 1-11

In the present paper we investigated macrophyte community structure in 60 natural and impacted stream and river sites distributed throughout the Walloon river network. The objectives were to describe the ... [more ▼]

In the present paper we investigated macrophyte community structure in 60 natural and impacted stream and river sites distributed throughout the Walloon river network. The objectives were to describe the distribution of macrophyte assemblages in relation to physico‐chemical parameters of their environment and to assess the variability in ecological metrics within these watercourses. Two‐way clustering allowed us to simultaneously assign sample units and species to groups by performing two separate cluster analyses. Indicator species analysis allowed us to assess the degree to which a species indicated a group, based on its constancy and distribution of abundance. Six end‐groups were identified as a result of using twoway clustering and indicator species analysis techniques. Hygroamblystegium fluviatile, Chiloscyphus polyanthos and Lemanea fluviatilis were found to characterize acidic and low impacted streams and rivers (G1), while Ranunculus fluitans was found in all low impacted large streams (G2). Potamogeton pectinatus, proved to be more common in eutrophicated waters in the calcareous areas particularly in the ʺLoess low plateauxʺ region (G6). Cinclidotus riparius, Fissidens crassipes and Pellia endiviifolia, appeared in rivers situated in the Condroz region (G4), which was characterized by a high concentration of nitrogen. [less ▲]

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See detailMacrophytes: limitations of using them to assess reservoir status according to the Water Framework Directive
Sossey Alaoui, Khadija ULiege; Galoux, Daniel; Rosillon, Francis ULiege

in Peer Review (2013)

Macrophytes are among the major groups of organisms that the Water Framework Directive (WFD) recommends should be used in assessing the status of natural Lakes. The use of macrophytes in reservoir ... [more ▼]

Macrophytes are among the major groups of organisms that the Water Framework Directive (WFD) recommends should be used in assessing the status of natural Lakes. The use of macrophytes in reservoir monitoring is still fairly limited and studies are needed on their inter-calibration and sources of variation. Many status assessment methods based on macrophyte communities have been defined for lakes, Nevertheless few of them have been tested for reservoirs. The purpose of the study is to highlight the limitations of using macrophytes to assess reservoir status according to the Water Framework Directive. An assessment of macrophyte composition and abundance and of water quality was carried out in nine Walloon reservoirs between 2010 and 2012. The main limitations of the macrophyte approach for assessing these reservoirs were: i) geographical features, ii) physical variables and iii) lack of ecological information on the various macrophytic groups, such as helophytes, algae and mosses. We used two assessment methods to test the relevance of using macrophyte communities to assess reservoir status: the Flanders (Belgium) method (BE-FL method) and the United Kingdom method (UK-method). The relationships between macrophyte metrics for both methods and nutrient enrichment were examined. Highly significant correlations were found between the chemical variables (O-P [mg P/l]); Total P (µg P/l); Conductivity (µS/cm) and the trophic UK-metric (Lake Macrophyte Nutrient) (LMNI); and between it and the abundance of Bl-FL "disturbance indicators’ metric (V). The UK "group of macrophyte species’ metric provide a limited information's on the quality or degree of degradation of the environment from which the sample was taken. [less ▲]

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