Triki H.Z.,University of Carthage |
Daly-Yahia O.K.,University of Carthage |
Komiha Y.,University of Carthage |
Deidun A.,University of Malta |
And 2 more authors.
Marine Pollution Bulletin | Year: 2014
This study investigated the spatial distribution of Alexandrium pseudogonyaulax resting cysts in recently-deposited sediment of Bizerte lagoon (South-Western Mediterranean, Tunisia). This lagoon is the subject of many anthropogenic impacts, such as holding important fishing and aquaculture activities. A. pseudogonyaulax has been shown to produce Goniodomin A, which is a biologically-active compound. We showed that this dinoflagellate produces two types of resting cysts, which could be distinguished by the presence or the absence of a paratabulate wall. The average cyst density across the whole lagoon was rather high, reaching 639cystsg-1 of dry sediment (DS). Cyst densities varied widely among the sampled stations, with the highest density of 1685cystg-1DS being recorded at station 51 near a mussel farm. With respect to sediment characteristics, the highest cyst densities were found within silty sediments with high water content values. The distribution of A. pseudongoyaulax cysts in Bizerte lagoon appears to be related to hydrodynamic factors. © 2014 Elsevier Ltd.
Eleftheriou A.,University of Crete |
Anagnostopoulou-Visilia E.,Manousou Koundourou |
Anastasopoulou E.,Hellenic Center for Marine Research |
Ates S.A.,Canakkale Onsekiz Mart University |
And 25 more authors.
Mediterranean Marine Science | Year: 2011
The present work reports on recent biodiversity records of Mediterranean native species such as Olindias phosphorica in the Turkish Aegean Sea and extended distribution of eleven alien species in the Mediterranean. These are: Bursatella leachi (Mollusca, Gastropoda: Algeria); Callinectes sapidus (Crustacea, Decapoda: Greek Ionian Sea); Caprella scaura (Crustacea, Amphipoda: Mar Piccolo of Taranto); Fistularia commersonii (Fish: Saronikos Gulf, Aegean Sea); Sphoeroides pachygaster (Fish: South Turkey); Musculista perfragilis (Mollusca, Bivalvia: South Turkey); Sepioteuthis lessoniana (Mollusca, Cephalopoda: central eastern coast of Tunisia); Flabellina rubrolineata (Mollusca, opisthobranchia: central Aegean, Greece); Hesionura serrata (Polychaeta: Apulian coast); Stephanolepis diaspros (Fish: Saronikos Gulf, Aegean Sea); and Parvocalanus crassirostris (Crustacea, Copepoda: Lesvos Island, Greek Aegean Sea).
Jaziri S.,Institute National Des Science Et Technology Of La Mer Instm |
Jaziri S.,Institute National Agronomique Of Tunisie Inat |
Costantini F.,University of Bologna |
Rugiu L.,University of Turku |
And 3 more authors.
Hydrobiologia | Year: 2016
The precious octocoral Corallium rubrum has a long history of exploitation in the Mediterranean Sea. Historically, harvesting followed the “boom and bust” cycles whereby newly discovered beds were overexploited to depletion. In the past, most of the red coral harvesting came form France, Italy, and Spain. Today, landing data show that Tunisia is the third largest supplier of C. rubrum. The aim of this study was to asses whether and how the exploitation effort affects size distribution and genetic diversity of Tunisian commercial populations. Biometric data and microsatellite markers were used to characterize 113 colonies collected on nine commercial banks. Size and branching pattern indicate that collected colonies are up to 100 years old with a high reproductive rate. Nevertheless, 38% of the colonies were undersized according to FAO-GFCM recommendations (basal diameter <7 mm). Tunisian populations showed a weak genetic structuring and significant differentiation between coastal and offshore populations. Harvesting did not alter the structure of red coral populations. However, technological improvement and intensive harvesting of Tunisian banks, if not properly managed, may lead to their rapid depletion, causing long-lasting shifts in population demography and genetic structure, and the loss of this valuable resource. © 2016 Springer International Publishing Switzerland
Benmessaoud R.,Institute National Agronomique Of Tunisie |
Benmessaoud R.,Institute National Des Science Et Technology Of La Mer Instm |
Cherif M.,Institute National Agronomique Of Tunisie |
Cherif M.,Institute National Des Science Et Technology Of La Mer Instm |
Bejaoui N.,Institute National Agronomique Of Tunisie
Journal of Cetacean Research and Management | Year: 2013
The common bottlenose dolphin has been studied intensively in numerous locations around the world but very little is known about this species along the South Mediterranean Basin. In this study, the temporal distribution of dolphins, group dynamics, site fidelity and association patterns of common bottlenose dolphins along the northeastern coastal waters of Tunisia was assessed through mark-recapture photo-identification techniques. Prior to this study, no research has focused on bottlenose dolphins within these waters, despite the potential for human impacts on this species. A total of 718h of boat-based observations, spanning 284 days, were spent at sea between August 2008 and July 2010. During this period, 253h were spent in direct observation of 317 groups of common bottlenose dolphins. Bottlenose dolphins were observed in all seasons, although seasonality was evident, with more encounters during the summer. Photo-identification studies show that 43 individuals used the northeastern coast of Tunisia on a regular basis, while others were present less often. Based on a social structure analysis it was possible to discriminate different communities related with the spatial distribution of the sightings (Zembra island, Hammamct, Kelibia and Galitc island).
Hattour A.,Institute National Des Science Et Technology Of La Mer Instm |
Bradai M.N.,Institute National Des Science Et Technology Of La Mer Instm
Marine Biodiversity Records | Year: 2013
The shrimp scad, Alepes djedaba is known to be established in the eastern Levant. The present study describes a case of a school (100 specimens) caught with purse seine on 14 June 2012 in Tunisia (Gulf of Gabès: 34°10′240 10°58′180) that constitutes the first record of its westernmost appearance. © Marine Biological Association of the United Kingdom 2013.