Catalogue commenté des coléoptères des dunes mobiles de la frange septentrionale et de la région orientale du Maroc

Abstract This work focuses on the study of spatial distribution of beetles population in the mobile dunes of the northern fringe of the eastern region of Morocco. This study is spread over a route of 4000 km from the Guercif dunes toward the large dunes of Merzouga (Sahara) passing by dunes of northeast of Missour, Midelt, Ain Beni Methar, Tendrara, Rich, Boulmane, Bouârfa, Boudnib and Erfoud. Entomological population is dominated by the family Tenebrionidae which is well suited to this type of extreme weather environment. The super family Scarabaeoidea came in the second place and whose species are mostly attracted by the dung feces. Large taxonomic richness is noted in Tendrara, Figuig and Bouârfa. Recorded values of abundance were high in the Saharan and desertic stations of Figuig, Erfoud, Merzouga and Tendrara.  Keywords: Coleoptera, Mobile dunes, Northern fringe, Eastern Region, Morocco, Sahara.Le présent travail porte sur l’étude faunistique de la distribution spatiale du peuplement des coléoptères des dunes mobiles de la frange septentrionale et de la région Orientale du Maroc. Cette étude est répartie sur un itinéraire de 4000 km, depuis les dunes de Guercif (Nord) jusqu’aux grandes dunes de Merzouga (Sahara), toute en passant par les dunes des stations suivantes: Nord Est de Missour, Midelt, Aïn Beni Methar, Tendrara, Rich, Boulmane, Bouârfa, Boudnib et Erfoud. Le peuplement entomologique est dominé par la famille des Tenebrionidae qui est la plus représentée et bien adaptée à ce type de milieu d’extrêmes conditions climatiques. La super famille des Scarabaeoidea vient en deuxième position et dont les espèces sont pour la plupart des coprophages attirés par les fèces. Une grande richesse taxonomique est notée à Tendrara, à Figuig et à Bouârfa. Il en est de même pour l’abondance dont les fortes valeurs sont notées dans les stations sahariennes et désertiques de Figuig, Erfoud, Merzouga et Tendrara. Mots clés: Coléoptères, Dunes mobiles, Frange septentrionale, Région Orientale, Maroc, Sahara. &nbsp

Catalogue commenté des coléoptères des dunes mobiles de la frange septentrionale et de la région orientale du Maroc

Abstract This work focuses on the study of spatial distribution of beetles population in the mobile dunes of the northern fringe of the eastern region of Morocco. This study is spread over a route of 4000 km from the Guercif dunes toward the large dunes of Merzouga (Sahara) passing by dunes of northeast of Missour, Midelt, Ain Beni Methar, Tendrara, Rich, Boulmane, Bouârfa, Boudnib and Erfoud. Entomological population is dominated by the family Tenebrionidae which is well suited to this type of extreme weather environment. The super family Scarabaeoidea came in the second place and whose species are mostly attracted by the dung feces. Large taxonomic richness is noted in Tendrara, Figuig and Bouârfa. Recorded values of abundance were high in the Saharan and desertic stations of Figuig, Erfoud, Merzouga and Tendrara.  Keywords: Coleoptera, Mobile dunes, Northern fringe, Eastern Region, Morocco, Sahara.Le présent travail porte sur l’étude faunistique de la distribution spatiale du peuplement des coléoptères des dunes mobiles de la frange septentrionale et de la région Orientale du Maroc. Cette étude est répartie sur un itinéraire de 4000 km, depuis les dunes de Guercif (Nord) jusqu’aux grandes dunes de Merzouga (Sahara), toute en passant par les dunes des stations suivantes: Nord Est de Missour, Midelt, Aïn Beni Methar, Tendrara, Rich, Boulmane, Bouârfa, Boudnib et Erfoud. Le peuplement entomologique est dominé par la famille des Tenebrionidae qui est la plus représentée et bien adaptée à ce type de milieu d’extrêmes conditions climatiques. La super famille des Scarabaeoidea vient en deuxième position et dont les espèces sont pour la plupart des coprophages attirés par les fèces. Une grande richesse taxonomique est notée à Tendrara, à Figuig et à Bouârfa. Il en est de même pour l’abondance dont les fortes valeurs sont notées dans les stations sahariennes et désertiques de Figuig, Erfoud, Merzouga et Tendrara. Mots clés: Coléoptères, Dunes mobiles, Frange septentrionale, Région Orientale, Maroc, Sahara. &nbsp

Catalogue commenté des coléoptères des dunes mobiles de la frange septentrionale et de la région orientale du Maroc

This work focuses on the study of spatial distribution of beetles population in the mobile dunes of the northern fringe of the eastern region of Morocco. This study is spread over a route of 4000 km from the Guercif dunes toward the large dunes of Merzouga (Sahara) passing by dunes of northeast of Missour, Midelt, Ain Beni Methar, Tendrara, Rich, Boulmane, Bouârfa, Boudnib and Erfoud. Entomological population is dominated by the family Tenebrionidae which is well suited to this type of extreme weather environment. The super family Scarabaeoidea came in the second place and whose species are mostly attracted by the dung feces. Large taxonomic richness is noted in Tendrara, Figuig and Bouârfa. Recorded values of abundance were high in the Saharan and desertic stations of Figuig, Erfoud, Merzouga and Tendrara

Affinité et organisation écologique du peuplement coléoptèrologique des écosystèmes dunaires mobiles au niveau de la frange septentrionale et de la région oriental du Maroc.

The present work aims for a better understanding of the ecological organization of entomological groups of beetles found in mobile dunes of Eastern Morocco and in the northern fringe of the Sahara. This study is carried out over a route of 4000 km from the Guercif dunes (north) to the large dunes of Merzouga (Sahara), passing by dunes of the following stations: Northeast Missour ; Midelt, Aïn Beni Methar, Tendrara, Rich, Boulman, Bouârfa, Boudnib and Erfoud. From analysis of affinity, three major faunal groups were identified. The first group is formed by the northern stations (Guercif, Northeast Missour, Midelt and Aïn Beni Methar) housing faunal species of the Mediterranean dunes. The second group consists of Tendrara, Bouârfa, Rich and Bouânane stations, having a high level of fauna similarity due in part to their proximity. The last group was formed by the station of Merzouga, Erfoud, Boudnib and Figuig which feature a frankly Saharan population. Taxa collected in these Saharan stations were collected along a north-south geographical gradient whose northern end is formed by the characteristic species of the Mediterranean area while the southern end is made of the wildlife species characteristic of the Saharan fringe. Keywords: Coleoptera, Mobile dunes, North Fringe, Eastern Region, Morocco, Sahara.Le présent travail vise une meilleure connaissance de l’organisation écologique des groupements de coléoptères des dunes mobiles du Maroc oriental et de la frange septentrionale occidentale du Sahara. Cette étude couvre un itinéraire de 4000 km, allant des dunes de Guercif (Nord) jusqu’aux grandes dunes de Merzouga (Sahara), tout en passant par les dunes des stations du Nord Est de Missour, Midelt, Aïn Beni Methar, Tendrara, Rich, Boulmane, Bouârfa, Boudnib et Erfoud. L’analyse de l’affinité, fait ressortir trois grands groupes faunistiques: le premier est formé par les stations nordiques (Guercif, N-E de Missour, Midelt et Aïn Beni Mathar) abritant des espèces des dunes méditerranéennes, le deuxième groupe est formé par les stations de Tendrara, Bouârfa, Rich et Bouânane présentant un niveau de similitude faunistique relativement important dû en partie à leur proximité. Le dernier groupe formé par la station de Merzouga, Erfoud, Boudnib et Figuig qui abritent un peuplement franchement saharien. Les taxons récoltés dans ces stations sont répartis le long d’un gradient géographique Nord-Sud. Ceux de l’extrémité Nord sont formés par des espèces typiques de la zone méditerranéenne, alors que ceux de l’extrémité Sud sont composé par des espèces caractéristiques de la frange saharienne. Mots clés: Coléoptères, Dunes mobiles, Frange septentrionale, Région Orientale, Maroc, Sahara. &nbsp

Basic dye removal from aqueous solutions by dodecylsulfate- and dodecyl benzene sulfonate-intercalated hydrotalcite

8 pagesInternational audienceDodecylsulfate- and dodecyl benzene sulfonate-hydrotalcites were prepared by calcination–rehydratation method. The surfactants intercalation in the interlayer space of hydrotalcite were checked by PXRD and FTIR spectroscopy where the resulting materials were found to be similar to those reported in the literature and were used to remove a basic dye (safranine) from aqueous solutions. The sorption kinetics data fitted the pseudo second order model. The isotherms were established and the parameters calculated. The sorption data fitted the Langmuir model with good values of the determination coefficient. The thermodynamic parameters calculated from Van't Hoff plots gave a low value of G◦ (<−20 kJ mol−1) indicating a spontaneous physisorption process. Two regeneration cycles were processed by acetone extraction leading to the same removal capacity of the obtained materials as the original surfactant-intercalated hydrotalcites. The UV–vis spectra of the recovered extracts were similar to the spectrum of safranine, which means that the dye was recovered without any modification

Differential proteomics reveals the hallmarks of seed development in common bean (Phaseolus vulgaris L.)

Common bean (Phaseolus vulgaris L.) is one of the most consumed staple foods worldwide. Little is known about the molecular mechanisms controlling seed development. This study aims to comprehensively describe proteome dynamics during seed development of common bean. A high-throughput gel-free proteomics approach (LC-MS/MS) was conducted on seeds at 10, 20, 30 and 40days after anthesis, spanning from late embryogenesis until desiccation. Of the 418 differentially accumulated proteins identified, 255 were characterized, most belonging to protein metabolism. An accumulation of proteins belonging to the MapMan functional categories of "protein", "glycolysis", "TCA", "DNA", "RNA", "cell" and "stress" were found at early seed development stages, reflecting an extensive metabolic activity. In the mid stages, accumulation of storage, signaling, starch synthesis and cell wall-related proteins stood out. In the later stages, an increase in proteins related to redox, protein degradation/modification/folding and nucleic acid metabolisms reflect that seed desiccation-resistance mechanisms were activated. Our study unveils new clues to understand the regulation of seed development mediated by post-translational modifications and maintenance of genome integrity. This knowledge enhances the understanding on seed development molecular mechanisms that may be used in the design and selection of common bean seeds with desired quality traits. SIGNIFICANCE: Common bean (P. vulgaris) is an important source of proteins and carbohydrates worldwide. Despite the agronomic and economic importance of this pulse, knowledge on common bean seed development is limited. Herein, a gel-free high throughput methodology was used to describe the proteome changes during P. vulgaris seed development. Data obtained will enhance the knowledge on the molecular mechanisms controlling this grain legume seed development and may be used in the design and selection of common bean seeds with desired quality traits. Results may be extrapolated to other pulses