Regional Activity Center for Specially Protected Areas

Tunis, Tunisia

Regional Activity Center for Specially Protected Areas

Tunis, Tunisia

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Hatchling sex ratios in loggerhead marine turtles (Caretta caretta) were estimated on the beaches near Sirte (Libya), using two methods: incubation duration and nest mean temperature during the middle third of the incubation period. Electronic temperature/humidity loggers were deployed at a total of 13 selected nests at Al-Ghbeba, Al-Thalateen, west of Al- Thalateen, Shash and Al-Arbaeen. The incubation period ranged from 47 to 58 days and average temperature ranged from 29°C to 31.8°C. The maximum temperature during this period increased to between 0.6°C and 3.5°C, while the mean temperature also increased during the middle third of the incubation period compared with the first third and continued to increase during the last third. As expected, this study showed that the temperature in the nest decreased with increasing depth of the nest. The results showed a female-dominated sex ratio at 85.4% on the basis of incubation duration and 70.4% on the basis of mean temperature. These findings support the reported highly female-skewed sex ratios in the Mediterranean and elsewhere.

Rochette J.,Institute for Sustainable Development and International Relations IDDRI | Unger S.,Institute for Advanced Studies in Sustainability IASS | Herr D.,International Union for Conservation of Nature IUCN | Johnson D.,Seascape Consultants Ltd | And 6 more authors.
Marine Policy | Year: 2014

The development of regional initiatives for the protection of the environment is a cornerstone of international environmental policies. With regard to marine and coastal issues, this regionalisation has mainly been taking place through regional seas programmes and Regional Fisheries Management Organisations. Some regional initiatives and organisations have progressively extended their activities to areas beyond national jurisdiction. This paper aims at analysing these recent developments, highlighting their interests and challenges, and proposing options to strengthen the efficiency of regional actions in these areas. It also highlights the need to consider the global discussions on a possible new global agreement and the development of regional actions as two interconnected processes. © 2014 Elsevier Ltd.

Bazairi H.,Mohammed V University | Sghaier Y.R.,Regional Activity Center for Specially Protected Areas | Benamer I.,University of Omar Mukhtar | Langar H.,University of Tunis | And 5 more authors.
Mediterranean Marine Science | Year: 2013

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 in October 2010 within the framework of the MedMPAnet project and results of further monitoring during June and September 2012. A total of 9 alien species were reported: namely Rhodophyta Asparagopsis taxiformis (Delile) Trevisan de Saint-Léon, 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 these species 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 have been recorded along the Libyan coastline. 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, 5 questionable, 3 cryptogenic and 1 unknown. An in-depth study of marine organisms would substantially increase the number of alien species occurring in Libya. Monitoring of marine assemblages of MPAs provides a valuable opportunity for delving further into the knowledge of native and introduced species.

Langar H.,Institute National Des Science Et Technologies Of La Mer Instm | Bessibes M.,Institute National Des Science Et Technologies Of La Mer Instm | Djellouli A.,Tunis el Manar University | Pergent-Martini C.,Regional Activity Center for Specially Protected Areas | And 2 more authors.
Journal of Coastal Research | Year: 2011

Neogoniolithon brassica-florida (encrusting rhodobionta) is generally reported as a veneering coral community along the wave-beaten rocky coast of the Mediterranean Sea. Its presence in the hyperhaline lagoon of Bahiret el Bibane, situated in SE Tunisia, takes on particular importance because of its extension. It constitutes a reef formation 14 km long developing on both sides of the sea inlet. The building of this "natural monument" seems to be the result of an evolutionary series. The aim of this study was to investigate the current status of this reef, comparing it to 30 years ago. The current extension of the Neogoniolithon brassica-florida reef appears to be much reduced from that reported 30 years ago, indicating a regression of 26%. Four different phases leading to the reef building were also identified. © Coastal Education & Research Foundation 2011.

Sghaier Y.R.,University of Tunis | Sghaier Y.R.,Regional Activity Center for Specially Protected Areas | Zakhama-Sraieb R.,University of Tunis | Charfi-Cheikhrouha F.,University of Tunis
Mediterranean Marine Science | Year: 2011

The subtropical crab, Percnon gibbesi is established along the Tunisian coasts. This crab was recorded by underwater observation from Malloula, Tabarka, El-Haouaria, Yasmine Hammamet, Monastir marina and the Kuriat Islands. These new observations increase the known distribution of P. gibbesi in the south Mediterranean basin.

Lopez Y Royo C.,Agency for Environmental Protection and TS | Lopez Y Royo C.,University of Corsica | Pergent G.,University of Corsica | Pergent-Martini C.,Regional Activity Center for Specially Protected Areas | Casazza G.,Agency for Environmental Protection and TS
Environmental Monitoring and Assessment | Year: 2010

The seagrass Posidonia oceanica is extensively monitored in Mediterranean coastal waters and is an ideal candidate for an eco-regional assessment of the coastal ecosystem. The aim of this study is to evaluate the potential of P. oceanica as eco-regional indicator for its assessment at the scale of Mediterranean basin. For this purpose, regional and national P. oceanica monitoring programmes are identified, and their data and metadata are collected and compared in terms of objectives, strategies, sampling designs and sampling methods. The analysis identifies a number of issues concerning data quality, reliability and comparability. In particular, the adoption of different sampling designs and methods may introduce relevant errors when comparing data. The results of this study stress the necessity of carefully planning monitoring programmes. Moreover, it highlights that the adoption of a number of common tools would facilitate all Mediterranean monitoring activities and allows an optimisation of management efforts at an eco-regional scale. © 2009 Springer Science+Business Media B.V.

Lejeusne C.,French National Center for Scientific Research | Chevaldonne P.,French National Center for Scientific Research | Pergent-Martini C.,Regional Activity Center for Specially Protected Areas | Boudouresque C.F.,French National Center for Scientific Research | Perez T.,French National Center for Scientific Research
Trends in Ecology and Evolution | Year: 2010

Little doubt is left that climate change is underway, strongly affecting the Earth's biodiversity. Some of the greatest challenges ahead concern the marine realm, but it is unclear to what extent changes will affect marine ecosystems. The Mediterranean Sea could give us some of the answers. Data recovered from its shores and depths have shown that sea temperatures are steadily increasing, extreme climatic events and related disease outbreaks are becoming more frequent, faunas are shifting, and invasive species are spreading. This miniature ocean can serve as a giant mesocosm of the world's oceans, with various sources of disturbances interacting synergistically and therefore providing an insight into a major unknown: how resilient are marine ecosystems, and how will their current functioning be modified? © 2009 Elsevier Ltd. All rights reserved.

Lopez y Royo C.,University of Corsica | Lopez y Royo C.,Agency for Environmental Protection and TS | Casazza G.,Agency for Environmental Protection and TS | Pergent-Martini C.,Regional Activity Center for Specially Protected Areas | Pergent G.,University of Corsica
Ecological Indicators | Year: 2010

The development of ecologically based indices that respond to disturbances in a predictable manner has been stressed by the EU Water Framework Directive. The seagrass Posidonia oceanica, given its ecological indicator characteristics, has been identified as one of the elements to determine ecological status under the EU Water Framework Directive. The purpose of this study is therefore to develop a biotic index based on P. oceanica (BiPo), focussing on: (i) the necessity of an index that may be applied over the largest geographical extent possible, (ii) the necessity of a tool for a baseline evaluation of P. oceanica status in the Mediterranean, (iii) the compliance with WFD requirements, (iv) the efficiency of the method in terms of reliability and cost. The BiPo index is developed on the basis of all P. oceanica monitoring data available in the western Mediterranean and on a standard assessment of anthropogenic pressures. The index metrics are selected and evaluated on the basis of this pressures assessment, and are subsequently integrated for the evaluation of ecological status. The index is then tested on 15 sites around Corsica (France). The results show that the BiPo well reflects meadow health status and ecological status. Furthermore it is reliable, standard and cost-effective, and can be applied to a wide array of management and conservation purposes. © 2009 Elsevier Ltd. All rights reserved.

Zakhama-Sraieb R.,University of El Manar | Zakhama-Sraieb R.,Manouba University | Sghaier Y.R.,University of El Manar | Sghaier Y.R.,Regional Activity Center for Specially Protected Areas | And 4 more authors.
Environmental Science and Pollution Research | Year: 2016

The accumulation of the five trace metals (TMs) cadmium, copper, lead, nickel and zinc was measured in Posidonia oceanica leaves. Shoots were seasonally sampled at 8–10-m depth from four stations located in Port El Kantaoui area, Tunisia, during four campaigns performed in 2012. Levels of the five TMs were analyzed using inductively coupled plasma atomic emission spectrometry (ICP-AES) in three compartments of P. oceanica shoots: blades and sheaths of adult leaves and intermediate leaves. Results showed a preferential accumulation of Cd, Pb, Ni and Zn in adult leaf blades. Therefore, we focus on the study of this compartment. TM levels of blades of adult leaves decreased in the following order: Zn > Ni > Cu > Pb > Cd, irrespective of the season. Levels of the five TMs significantly differed between seasons (p < 0.01). Levels of Cd and Cu showed a seasonal pattern: Cd decreased from spring to winter while Cu increased during that same period of time. A significant correlation (p < 0.01) was found between Cd–Cu and Cd–Pb. A significant correlation (p < 0.05) was also noted between Cd-Ni in the adult leaf blades. A relationship was recorded between the foliar surface of the adult leaf blades and Zn accumulation. This survey allowed to highlight the annual variation of TM accumulation in adult leaf blades of P. oceanica, in relation with ecophysiology of this seagrass. Therefore, this study reinforces the usefulness and the relevance of this compartment of P. oceanica, easy to sample without destruction of whole shoot, as a bioindicator of Zn, Ni, Cd and Pb contamination. © 2015, Springer-Verlag Berlin Heidelberg.

Sghaier Y.R.,Tunis el Manar University | Sghaier Y.R.,Regional Activity Center for Specially Protected Areas | Zakhama-Sraieb R.,Tunis el Manar University | Benamer I.,Omar Al-Mukhtar University | Charfi-Cheikhrouha F.,Tunis el Manar University
Botanica Marina | Year: 2011

Halophila stipulacea is a dioecious seagrass that colonised the Mediterranean basin probably following the opening of the Suez Canal in 1869. We investigated its occurrence in the southern Mediterranean. This was done by conducting targeted surveys in two countries (Tunisia and Libya) and compiling existing information from former research. Four new meadows of H. stipulacea were found in the study area: Al-wahesh Lagoon and Tobrouk Bay in Libya, and Kerkennah Island-Allama and Cap Monastir in Tunisia. The new record in Cap Monastir (Tunisia) documents a displacement of approximately 150 km north of the previous limit of H. stipulacea in the southern Mediterranean, which probably represents the westernmost extension of H. stipulacea's distribution 3000 km west along the coast from the site of first colonisation at the mouth of the Suez Canal in Port Said. In the Cap Monastir meadow, the shoot density (±SD) was 9900±3509 m -2and the leaf area index was 3.15±0.5 m 2m -2. In Libya, a small meadow of H. stipulacea was documented for the first time in Tobrouk Bay, with an estimated shoot density of 476±83 m -2. © 2011 by Walter de Gruyter Berlin Boston.

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