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Inventory, Systematic and Biogeography of Brachyuran Crabs (Crustacea: Decapoda: Brachyura) on the Tunisian Coast

Open Journal of Ecology 2023年第10期13卷 711-730页

作者： wahiba zaabar Mohamed Sghaier Achouri Laboratory of Diversity Management and Conservation of Biological Systems Faculty of Sciences of Tunis University of Tunis El Manar Tunis Tunisia

Several prospects on the northern, central and southern Tunisian coasts were carried out for the sake of a better interpretation of Brachyuran species distribution. Animals were either, captured by hand, caught with a fine mesh net or brought back by fishermen in nets or dredges. A total of 21 species belonging to twelve families and inhabiting different substrates were collected and divided into littoral species and species of depth. Five species were reported for the first time, in Tunisia. The littoral species are Carcinus aestuarii, Liocarcinus corrugatus, Liocarcinus vernalis, Pachygrapsus marmoratus, Pachygrapsus maurus, Brachynotus sexdentatus, Eriphia verrucosa, Maja squinado, Maja crispata, Acanthonyx lunulatus and Pisa tetraodon. The species of depths are Portunus hastatus, Euchirograpsus liguricus, Xantho granulicarpus, Ilia nucleus, Inachus dorsettensis, Lissa chiragra, Pisa corallina, Pisa armata, Calappa granulata and Dromia personata. All these species are reported in the Mediterranean. Some are reported for the first time in Tunisia: P. maurus, A. lunulatus, P. hastatus, E. liguricus, L. chiragra and P. corallina. In order to know the frequency of each species, the presence index was calculated. Carcinus aestuarii present in 91% of prospected stations is the most frequent and wide-distributed brachyuran species along Tunisian coasts.

关键词： Brachyurans Biogeography Tunisian Coasts Mediterranean Sea

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The Influence of Environmental Factors on the Population Structure and Reproductive Biology of Idotea balthica basteri (Isopoda, Valvifera) of the Bizerte Lagoon (Northern Tunisia)

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Open Journal of Ecology 2016年第4期6卷 206-218页

作者： wahiba zaabar Faouzia Charfi-Cheikhrouha Mohamed Sghaier Achouri Unité de Recherche de Bio-Ecologie et Systématique Evolutive (UR11ES11) Faculté des Sciences de Tunis Université de Tunis El Manar Manar II Tunisia

The reproductive biology of a natural population of Idotea balthica basteri (Pallas, 1772) collected from Menzel Jemil (Bizerte lagoon, Tunisia) was monthly studied from October 2009 to October 2010. Besides water temperature, salinity, turbidity, pH, and dissolved oxygen were measured. Based on the state of differentiation of individuals, the population was divided into 8 categories. Their numbers depend on the one hand to intrinsic factors imposed by the specimens and the structure of the population themselves, and to extrinsic factors due to the variability of environmental conditions on the other hand. Females were morphologically recognisable at smaller size than males. Reproductive activity, which was reflected through the presence of ovigerous females and juveniles, underwent fluctuations throughout the year, but it was continuous. Moreover, salinity, temperature, nitrates, and plant biomass have a noticeable effect on the fecundity and fertility. The Principal Component Analysis also confirmed that the richness of the water in nitrates would be favorable to fecundity and fertility of Idotea balthica basteri. However, higher phosphate concentrations, in April and May seem to have a positive effect on the sex ratio. Otherwise, the temperature would be responsible for increasing the percentage of ovigerous females.

关键词： Population Structure Reproductive Biology Environmental Factors Idotea balthica Mediterranean Lagoon Tunisia

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Characterization of the Dominant Bacterial Communities Associated with Terrestrial Isopod Species Based on 16S rDNA Analysis by PCR-DGGE

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Open Journal of Ecology 2018年第9期8卷 495-509页

作者： Delhoumi Majed zaabar wahiba Bouslama Mohamed Fadhel Achouri Mohamed Sghaier Laboratory of Bio-Ecology and Evolutionary Systematics Department of Biology Faculty of Sciences of Tunis University of Tunis El Manar Tunis Tunisia

From the marine environment, woodlice gradually colonized terrestrial areas benefiting from the symbiotic relationship with the bacterial community that they host. Indeed, they constitute the only group of Oniscidea suborder that has succeed to accomplish their lives in terrestrial even desert surfaces. Herein they play an important role in the dynamic of ecosystems and the decomposition of litter. So to enhance our understanding of the sea-land transition and other process like decomposition and digestion of detritus, we studied the bacterial community associated with 11 specimens of terrestrial isopods belonging to six species using a Culture independent approach (DGGE). Bands sequencing showed that the cosmopolitan species Porcellionides pruinosus has the most microbial diversity. Screening demonstrated the predominance of Proteobacteria followed by members from Actinobacteria, Firmicutes and Cyanobacteria phyla. In fact we detected some symbionts like Wolbachia, Mycoplasma and Spiroplasma for the first time in a terrestrial isopod species.

关键词： Microbial Community PCR-DGGE Terrestrial Isopod Symbiont

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