Alien marine species of Libya: first inventory and new records in El-Kouf National Park (Cyrenaica) and the neighbouring areas

The presence of marine alien species in El-Kouf National Park and the neighbouring areas was assessed using a compilation of available information and observations, a field survey conducted on October 2010 in the framework of the MedMPAnet project and results of further monitoring during June and September 2012. A total of 9 alien species were reported: the Rhodophyta Asparagopsis taxiformis (Delile) Trevisan de Saint-Léon, the Chlorophyta Caulerpa racemosa var. cylindracea (Sonder) Verlaque, Huisman & Boudouresque, the crab Percnon gibbesi (H. Milne-Edwards, 1853) and the fishes Fistularia commersonii Rüppell, 1838, Siganus luridus (Rüppell, 1829), Siganus rivulatus Forsskål, 1775, Pempheris vanicolensis Cuvier, 1831, Lagocephalus sceleratus (Gmelin, 1789) and Sphyraena flavicauda Rüppell, 1838. Several of them were until now unknown for the National Park. The list of alien marine species of Libya is updated and discussed. Until now 63 marine aliens species were recorded along the Libyan coasts. These include 3 Foraminifera, 3 Ochrophyta, 5 Rhodophyta, 5 Chlorophyta, 1 Magnoliophyta, 11 Arthropoda, 13 Mollusca, 1 Echinodermata and 21 Chordata. Among these Non Indigenous Species, 43 are known as established along the Libyan coast including 8 invasive, 11 casual, 6 questionable, 3 cryptogenic and 1 unknown. An in-depth study of the marine organisms would substantially increase the number of alien species occurring in Libya. Monitoring of marine assemblages of MPAs is a valuable opportunity to go further into the knowledge of native and introduced species

Alien marine species of Libya: first inventory and new records in El-Kouf National Park (Cyrenaica) and the neighbouring areas

The presence of marine alien species in El-Kouf National Park and the neighbouring areas was assessed using a compilation of available information and observations, a field survey conducted on October 2010 in the framework of the MedMPAnet project and results of further monitoring during June and September 2012. A total of 9 alien species were reported: the Rhodophyta Asparagopsis taxiformis (Delile) Trevisan de Saint-Léon, the Chlorophyta Caulerpa racemosa var. cylindracea (Sonder) Verlaque, Huisman & Boudouresque, the crab Percnon gibbesi (H. Milne-Edwards, 1853) and the fishes Fistularia commersonii Rüppell, 1838, Siganus luridus (Rüppell, 1829), Siganus rivulatus Forsskål, 1775, Pempheris vanicolensis Cuvier, 1831, Lagocephalus sceleratus (Gmelin, 1789) and Sphyraena flavicauda Rüppell, 1838. Several of them were until now unknown for the National Park. The list of alien marine species of Libya is updated and discussed. Until now 63 marine aliens species were recorded along the Libyan coasts. These include 3 Foraminifera, 3 Ochrophyta, 5 Rhodophyta, 5 Chlorophyta, 1 Magnoliophyta, 11 Arthropoda, 13 Mollusca, 1 Echinodermata and 21 Chordata. Among these Non Indigenous Species, 43 are known as established along the Libyan coast including 8 invasive, 11 casual, 6 questionable, 3 cryptogenic and 1 unknown. An in-depth study of the marine organisms would substantially increase the number of alien species occurring in Libya. Monitoring of marine assemblages of MPAs is a valuable opportunity to go further into the knowledge of native and introduced species

Durye Pierre. — La généalogie

Henry Louis. Durye Pierre. — La généalogie. In: Population, 16ᵉ année, n°3, 1961. p. 563

First report of Caulerpa taxifolia (Vahl) J. Agardh in Tunisia.

Depuis sa parution en Méditerranée nord occidentale en 1984, l’algue verte d’origine tropicale Caulerpa taxifolia n’a pas cessé de progresser le long du littoral septentrional de la Méditerranée. Le présent travail signale pour la première fois la présence de cette algue sur le littoral oriental de la Méditerranée et plus précisément dans la rade de Sousse (Tunisie), en face du port, par 17 mètres de profondeur. L’arrivée de Caulerpa taxifolia à Sousse, n’est certainement pas le résultat d’une progression naturelle à partir d’anciennes station, l’hypothèse la plus probable expliquant son existence dans la rade serait son introduction liée à un transport de boutures par des embarcations ayant auparavant jeté l’encre dans des zones déjà envahies par l’espèce.Since its appearence in north west of Mediterranean sea in 1984, the green tropical seaweed Caulerpa taxifolia has nt ceased to progress along the northern coast of the Mediterranean. The present work signals for the first time the presence of this seaweed on the littoral oriental of the Mediterranean and more precisely in the roadstead of Sousse (Tunisia), in front of the harbour, by 17 meters depth. The arrival of Caulerpa taxifolia to Sousse, is certainly not the result of its natural progression from ancient stations. The most probable hypothesis explaining its existence in Sousse roadstead would be its introduction linked to an anchoring of boat having brought alga fragments attached to its anchor from tha already colonized site.منذ ظهوره بالشمال الغربي للبحر الأبيض المتوسط 1984 لم ينقطع الطحلب الأخضر، أصيل المناطق الاستوائية ، كوليربا تاكسيفوليا عن النمو على طول السواحل الشمالية للمتوسط في منطقة ربوض السفن التجارية أمام ميناء سوسة (الجمهورية التونسية) بأعماق تبلغ 17 مترا. نعتقد أن الفرضية الأكثر احتمالا لتفسير تواجد هذا الطحلب الدخيل تتمثل في جلبه عن طريق مخاطيف البواخر التجارية القادمة من جنوب أوروبا والتي أرست في سواحل مدينة سوسة.Publishe

"Q-FCRA: QoS-based OFDMA Femtocell Resource Allocation Algorithm"

International audienc

Structure and electrical characterization of ZnO-Ag phosphate glasses

Silver zinc phosphate glasses with a composition (40 − x/2) P2O5 – (40 − x/2) Na2O–20ZnO–x AgNO3 (x = 5, 10 and 15 mol%) were prepared of the glasses via conventional melt-quenching technique. From the Raman spectrum, the structure of the glasses was analyzed. Conduction and relaxation mechanisms in these glasses were studied using impedance spectroscopy in a frequency range from 10 Hz to 13 MHz and a temperature range from 323 K to 623 K. The dependence of electrical data on frequency was analyzed in the framework of the Nyquist's plot and Jonscher’s power law. The semicircles observed in the plots indicate a double relaxation process. The studied materials exhibit a significant contribution of bulk and interfacial effect to electrical conduction and to non-Debye relaxation process. The dc conductivity (σdc) follows Arrhenius behavior with temperature. The ac and dc conductivities of the samples were found to increase with the increase in temperature. The conductivity variation for P2O5-Na2O-ZnO glasses doped with various concentrations of AgNO3 was explained by the presence of ionic contribution.The dielectric characterizations include measurements involving the variation of the dielectric constant as well as the dielectric loss with frequency. The dielectric studies show low values for the dielectric constant and loss at high frequencies. Dependence of the electrical modulus of the glasses on frequency and temperature presented a relaxation phenomenon. Keywords: Glasses, Impedance spectroscopy, Conduction, Dielectri