Etude faunistique et écologique des annelides polychètes de la côte Nord-Est de la Tunisie (Peninsule du Cap Bon, Mediterranée Ouest)
The polychaetes communities structure and functioning of the Cap Bon peninsula (Northeast coast of Tunisia), were analyzed from 52 stations from Sidi Daoud to Menzel Horr. The faunistic study reveals the presence of 238 polychaetes species among which 86 records are newly reported for the Tunisian coasts. The total number of polychaetes listed in Tunisia rises to 375 species. The polychaete community structure at the sites was examined by multivariate methods. five main polychaetes communities were identified in the study area, the sandy sediment community (SS), the muddy sediments community (SV), the coarse sediment community (SG), the fine-muddy sediment community (SFV) and the Heterogeneous sediments community (HS). These communities are distributed mainly according to the particle size sediment and the Sampling depth. The SS community characterized by the dominance of Eunice vittata and the SG community dominated by Aponuphis fauveli showed the greatest number of species and diversity. Aponuphis fauveli, Eunice vittata and Protodorvillea kefersteini were the dominant species in the area. The particle size sediment and the sampling depth are also the main factors that govern the seasonal distribution of the polychaete communities in the Sidi Daoud-Ras Lahmer zone. Monitoring reveals that summer and winter seasons showed the highest values of density and diversity. The Cap Bon peninsula as a coastal zone is exposed to increasing anthropogenic activities, such as urban and industrial discharges and terrigenous several wadis. Polychaetes which react differently to this situation constitute an effective biological tool to detect signs of environmental degradation. Ecological groups and the AMBI index (Azti Marine Biotic Index) were used with biodiversity indices in order to evaluate the ecological quality of the Cap Bon peninsula. The general status of the study area is generally satisfactory and slightly polluted, except the inner part of the Sidi Daoud bay (station D and E) where we recorded an extremely polluted status. The first estimate of the genetic diversity populations of Hyalinoecia tubicola and Aponuphis bilineata based on the RAPD data analysis showed that these two species seem to be genetically similar.
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| Format: | Theses and Dissertations biblioteca |
| Language: | French |
| Published: |
2013
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| Subjects: | Polychaeta, Annelida, Seasonal variations, Genetic diversity, |
| Online Access: | http://hdl.handle.net/1834/5480 |
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