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Azzouz K.,University of Carthage | Diatta Y.,Institute Fondamental dAfrique Noire Cheikh Anta Diop | Mansour S.,University of Carthage | Boumaiza M.,University of Carthage | And 2 more authors.
Acta Ichthyologica et Piscatoria | Year: 2011

Two specimens of the west African goatfish, Pseudupeneus prayensis (Cuvier, 1829), were found for the first time off the Tunisian coast, in northern area. They constituted the third Mediterranean record of this fish. Both specimens were studied and described, and some biological observations were reported. Same taxonomic characters were concomitantly determined on two west African goatfish caught off the coast of Senegal, for comparison. The occurrence of Pseudupeneus prayensis in the area and the Mediterranean Sea is discussed and commented. Source


Chaabout S.,Hassan II University | Chennaoui Aoudjehane H.,Hassan II University | Reimold W.U.,Leibniz Institute for Evolution and Biodiversity Science | Reimold W.U.,Humboldt University of Berlin | And 4 more authors.
Journal of African Earth Sciences | Year: 2015

The current terrestrial impact crater record includes 188 accepted structures (http://www.passc.net/EarthImpactDatabase and Ferrière et al., 2015). This number continues to increase slowly but quite regularly. The heterogeneous distribution of impact structures is strongly influenced by the knowledge about impact cratering of exploration geologists, who have to be familiar with the possible field evidence for impact structures - and ultimately with the recognition criteria accepted for confirmation of new impact structures. For remote and poorly explored areas, satellite imagery is a powerful tool to identify circular structures that, at all scales, could be considered possible candidates for impact structures. Here, we present the results of a first systematic survey of circular structures over the Moroccan surface area (a total of 710,850 km2) using the imagery available through the Google-Earth software. Structures whose origins could not be elucidated from available geological data were then visited to determine their origin (impact or non-impact). Thirteen sites with one or more circular structures were investigated but none of them could be associated with an impact event. Instead, our results illustrate the diversity of geological processes that can produce circular structures, including magmatic and tectonic processes, bioconstruction, and even anthropogenic activity. It also demonstrates that circular structures are very common in surface imagery of the Earth but are generally not associated with impact events. This result questions whether this simple approach for the search of impact structures should be extended to other parts of the world. It also emphasizes that remote sensing imagery should not be used in isolation of other data. © 2015 Elsevier Ltd. Source


Diatta Y.,Institute Fondamental dAfrique Noire Cheikh Anta Diop | Reynaud C.,Montpellier University | Capape C.,Montpellier University
Journal of Ichthyology | Year: 2013

This paper gives the description of a striped panray Zanobatus schoenleinii (Müller and Henle, 1841) presenting the first case of albinism recorded in this species. The specimen was an adult male captured at low depth off the coast of Senegal (eastern tropical Atlantic). Comments on albinism in fishes are provided in this paper, especially all cases reported in batoid species. © 2013 Pleiades Publishing, Ltd. Source


Ben Souissi J.,Tunis el Manar University | Diatta Y.,Institute Fondamental dAfrique Noire Cheikh Anta Diop | Gargouri Ben Abdallah L.,Institute Nationa Agronomique Of Tunisie | Capape C.,Montpellier University
Cahiers de Biologie Marine | Year: 2011

A Monrovian surgeonfish, Acanthurus monroviae Steindachner, 1892, was found for the first time off the Tunisian coast, in the Gulf of Tunis, northern Tunisia. The specimen is described with morphometric measurements, meristic counts and some biological observations. The occurrence of A. monroviae in the area and the Mediterranean Sea is discussed and commented. Source


Capape C.,Montpellier University | Diatta Y.,Institute Fondamental dAfrique Noire Cheikh Anta Diop | Ndiaye P.,Institute Fondamental dAfrique Noire Cheikh Anta Diop | Reynaud C.,Montpellier University | Oddone M.C.,Federal Foundation University of Rio Grande
Ciencias Marinas | Year: 2010

A total of 483 specimens (236 males and 247 females) of the brown ray Raja miraletus were collected off the coast of Senegal (eastern tropical Atlantic). The hepatosomatic index (HSI) and gonadosomatic index (GSI) were calculated in both males and females, and the oviducosomatic index (OSI) in females. Both HSI and GSI increased significantly with specimen size and the three maturity stages considered (juveniles, subadults, and adults). The monthly HSI of adult males did not show significant variations throughout the year. In contrast, the HSI of adult females, GSI of both adult males and females, and OSI of females showed significant variations throughout year. This suggests that monthly variations occurred in the production of gonadal products even though vitellogenetic activity was observed throughout the year. Source

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