scholarly journals High diversified benthic habitats in a tidal Mediterranean sub-tropical environment: the case of the Gulf of Gabès (Tunisia)

2018 ◽  
Author(s):  
Abir Fersi ◽  
Nawfel Mosbahi ◽  
Ali Bakalem ◽  
Jean-Philippe Pezy ◽  
Alexandrine Baffreau ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Eastern Mediterranean ◽  
Tropical Environment ◽  
Gulf Of Gabes ◽  
Annual Cycles ◽  
Gulf Of Gabès ◽  
Zostera Noltei ◽  
Sediment Types ◽  
The Mediterranean ◽  
The Impact

The Gulf of Gabès on the southern coasts of Tunisia in the central part of the Mediterranean is a very shallow basin, characterized by semidiurnal tides, attaining a range of 2.3 m during spring tides. The intertidal zone was covered by extended Zostera (Zosterella) noltei Hornemann, 1832 beds mainly developed around the Kneiss Islands while tidal channels ensured the water circulation in this sub-tropical environment with very low freshwater input and high summer temperature. In spite of protected conventions, the area remained under high human pressures: overfishing, and the impact of the pollution of the phosphate industry. Intensive sampling in both intertidal and shallow subtidal zones during annual cycles permitted to identify a rich macrofauna which increase considerably the species known in this eastern part of the Mediterranean Sea. More than 50 species are added for the Tunisian fauna. Moreover, patterns of diversity are analysed with the sediment types, presence or absence of Zostera noltei seagrass bed, and human pressures. The list of the collected species are compared with those of surrounding areas in both Western and Eastern Mediterranean Sea.

scholarly journals High diversified benthic habitats in a tidal Mediterranean sub-tropical environment: the case of the Gulf of Gabès (Tunisia)

2018 ◽  
Author(s):  
Abir Fersi ◽  
Nawfel Mosbahi ◽  
Ali Bakalem ◽  
Jean-Philippe Pezy ◽  
Alexandrine Baffreau ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Eastern Mediterranean ◽  
Tropical Environment ◽  
Gulf Of Gabes ◽  
Annual Cycles ◽  
Gulf Of Gabès ◽  
Zostera Noltei ◽  
Sediment Types ◽  
The Mediterranean ◽  
The Impact

The Gulf of Gabès on the southern coasts of Tunisia in the central part of the Mediterranean is a very shallow basin, characterized by semidiurnal tides, attaining a range of 2.3 m during spring tides. The intertidal zone was covered by extended Zostera (Zosterella) noltei Hornemann, 1832 beds mainly developed around the Kneiss Islands while tidal channels ensured the water circulation in this sub-tropical environment with very low freshwater input and high summer temperature. In spite of protected conventions, the area remained under high human pressures: overfishing, and the impact of the pollution of the phosphate industry. Intensive sampling in both intertidal and shallow subtidal zones during annual cycles permitted to identify a rich macrofauna which increase considerably the species known in this eastern part of the Mediterranean Sea. More than 50 species are added for the Tunisian fauna. Moreover, patterns of diversity are analysed with the sediment types, presence or absence of Zostera noltei seagrass bed, and human pressures. The list of the collected species are compared with those of surrounding areas in both Western and Eastern Mediterranean Sea.

Allopodocotyle tunisiensis sp. nov. (Digenea, Opecoelidae), a parasite of Solea aegyptiaca (Teleostei, Soleidae) off Tunisia

2009 ◽  
Vol 54 (4) ◽  
Author(s):  
Hela Derbel ◽  
Lassad Neifar
Keyword(s):  
New Species ◽  
Mediterranean Sea ◽  
Seminal Vesicle ◽  
Ventral Sucker ◽  
Anterior Margin ◽  
Gulf Of Gabes ◽  
Gulf Of Gabès ◽  
The Status ◽  
The Mediterranean

AbstractAllopodocotyle tunisiensis sp. nov. is described from the intestine of Solea aegyptiaca Chabanaud collected from the Gulf of Gabès in the Mediterranean Sea off Tunisia. The new species belongs to the group C of Allopodocotyle Pritchard, 1966 species (sensu Bray 1987). It differs from its congeners in this group by the shape of the seminal vesicle and the anterior extend of the vitellarium which varies between just posterior to the ventral sucker and anterior margin. A key to the Allopodocotyle species of group C is presented. The status of the genera Allopodocotyle and Macvicaria (Gibson and Bray 1982) are briefly discussed.

High-resolution numerical modelling of the barotropic tides in the Gulf of Gabes, eastern Mediterranean Sea (Tunisia)

2017 ◽  
Vol 129 ◽  
pp. 224-232 ◽  
Author(s):  
Achref Othmani ◽  
Béchir Béjaoui ◽  
Cristèle Chevalier ◽  
Dalila Elhmaidi ◽  
Jean-Luc Devenon ◽  
...  
Keyword(s):  
High Resolution ◽  
Numerical Modelling ◽  
Mediterranean Sea ◽  
Eastern Mediterranean ◽  
Gulf Of Gabes ◽  
Eastern Mediterranean Sea ◽  
Gulf Of Gabès

scholarly journals Synthesis review of the Gulf of Gabes (eastern Mediterranean Sea, Tunisia): Morphological, climatic, physical oceanographic, biogeochemical and fisheries features

2019 ◽  
Vol 219 ◽  
pp. 395-408 ◽  
Author(s):  
Béchir Béjaoui ◽  
Sana Ben Ismail ◽  
Achref Othmani ◽  
Olfa Ben Abdallah-Ben Hadj Hamida ◽  
Cristèle Chevalier ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Eastern Mediterranean ◽  
Gulf Of Gabes ◽  
Eastern Mediterranean Sea ◽  
Gulf Of Gabès

Copepod community structure related to environmental factors from a summer cruise in the Gulf of Gabès (Tunisia, eastern Mediterranean Sea)

2009 ◽  
Vol 90 (1) ◽  
pp. 145-157 ◽  
Author(s):  
Zaher Drira ◽  
Malika Belhassen ◽  
Habib Ayadi ◽  
Asma Hamza ◽  
Rafik Zarrad ◽  
...  
Keyword(s):  
Environmental Factors ◽  
Mediterranean Sea ◽  
Eastern Mediterranean ◽  
Sampling Period ◽  
Trophic Levels ◽  
Copepod Community ◽  
Gulf Of Gabes ◽  
Small Copepod ◽  
Eastern Mediterranean Sea ◽  
Gulf Of Gabès

We studied the summer spatial distribution of the copepod community in both the neritic and oceanic areas of the Gulf of Gabès (Tunisia, eastern Mediterranean Sea) coupled with environmental factors. Copepods were the most abundant zooplankton throughout the sampling period, contributing 78% of the total zooplankton. A total of 14 copepod families were identified in all stations, with an overwhelming abundance of Acartiidae and Oithonidae (39.05 and 39.09% of total abundance, respectively). Abundance of Acartia clausi and chlorophyll-a concentrations were negatively correlated with salinity, suggesting that this species probably escaped the high coastal salinity (38 psu). Significant correlation determined between A. clausi and tintinnids at 50 m isobaths indicates that these planktonic ciliates probably served as a substantial food link towards higher trophic levels of this area. Conversely, Oithona nana which was well adapted to high chlorophyll-a concentrations and high salinity along the coast, showed significant correlations with Dictyochophyceae, Dinophyceae, Bacillariophyceae and Euglenophyceae, suggesting that this small copepod was capable of feeding on a wide selection of phytoplankton preys.

scholarly journals Amphipods from tidal channels of the Gulf of Gabès (central Mediterranean Sea)

2018 ◽  
Author(s):  
ABIR FERSI ◽  
JEAN CLAUDE DAUVIN ◽  
JEAN PHILIPPE PEZY ◽  
LASSAD NEIFAR
Keyword(s):  
Species Richness ◽  
Mediterranean Sea ◽  
Native Species ◽  
High Energy ◽  
Tidal Channels ◽  
Central Mediterranean ◽  
Gulf Of Gabes ◽  
Seagrass Meadows ◽  
Gulf Of Gabès ◽  
The Mediterranean

The spatial and temporal species richness, abundance and assemblage structure of amphipods from four tidal channel of the Gulf of Gabès were studied at 26 stations and during four seasons from March 2016 to January 2017. This led to the identification of 4,278 individuals, 45 species and 21 families. The four mostly diversified families are the Ampeliscidae (6 species), the Caprellidae (5) and the Aoridae and Maeridae (4 species both), while three families account for ~ 75% of the individuals: Aoridae (45.5 %), Corophiidae (20.5%) and Dexaminidae (7.2%). The species richness and abundance were higher in winter than at other seasons. The fauna is dominated by a small number of species characteristic of areas with detritus accumulation and seagrass meadows, including Microdeutopus anomalus, Monocorophium acherusicum, Dexamine spinosa, Microdeutopus gryllotalpa, Cymadusa filosa and Elasmopus rapax, which are commonly recorded in lagoons and coastal shallow waters of the Mediterranean Sea. The amphipod structure is linked to the location of tidal channels in the Gulf of Gabès. Abundances are low in the Kerkennah channel compared with other channels, especially the Maltine channel with high winter accumulation of organic matter. There are also low abundances in high-energy hydrodynamic zones with gravel sediment; conversely, the presence of macrophytes, mainly in the seagrass meadows, increases amphipod diversity. As a result of this study, five new species can be added to the inventory of the Tunisian marine amphipod fauna, including a non-native species for the Mediterranean Sea, Paracaprella pusilla.

The reproductive biology of the grey triggerfish Balistes capriscus (Pisces: Balistidae) in the Gulf of Gabès (south-eastern Mediterranean Sea)

2014 ◽  
Vol 94 (7) ◽  
pp. 1531-1537 ◽  
Author(s):  
Hichem Kacem ◽  
Lassâd Neifar
Keyword(s):  
Mediterranean Sea ◽  
Reproductive Biology ◽  
Eastern Mediterranean ◽  
Fork Length ◽  
Hepatosomatic Index ◽  
Gulf Of Gabes ◽  
Eastern Mediterranean Sea ◽  
South Eastern ◽  
Gulf Of Gabès ◽  
Balistes Capriscus

Fundamental information on the reproductive biology of the grey triggerfish Balistes capriscus from the Gulf of Gabès (south-eastern Mediterranean Sea) is based on 751 specimens, collected between June 2005 and May 2010, from commercial catches at different fishing ports at Chebba (34°14′N 11°06′E), Kerkennah (34°45′N 11°17′E) and Zarzis (33°41′N 11°48′E). The species were caught in this area using pelagic trawl nets. The calculation of the gonadosomatic index suggested that the spawning season of grey triggerfish occurred mainly between July and mid-September with a peak in July, coinciding with summer time. The first maturation occurred at 20.26 cm fork length for females and 21.3 cm fork length for males. The monthly values of hepatosomatic index and condition factor (K) indicated that the liver was the most severely stressed organ in the reproduction process of energy transfer. The absolute fecundity (F) ranged from 290,120 to 984,990 eggs per female. The fecundity of the species was determined by the size and weight of the individuals.

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