مساهمة في دراسة الكتلة الاحيائية لثنائيات المصراع Bivalvia وغزارتها في المياه تحت الشاطئية Sub-Littoral لشاطئ المحطة الحرارية وبرج الصبي في مدينة بانياس

This research deals with Bivalvia biomass and their abundance in sub-littoral water at Thermal station and Bourj Al-Saby on Banias Coast. This study was carried out throughout the period between, 15-06-2006 and 4-09-2007. 69 samples were collected by Grab van Veen – 1/40 m2 during six seasonal marine tours to four sites and at various depths of 5- 15 m. This study showed the huge biodiversity of species, as they reached 52 species. It also indicated a decrease in biomass, which varied between 15.2 g / m2 on site D and 0.33 g / m2 on site B. However, the abundance was different from one species to another and from one site to another. But, the highest percentage was recorded at individuals of the Glycymerididae on all sites under investigation, which increased up to 82 % on site D . Whereas it didn't exceed 1 % at individuals of family species: Carditidae, Liminidae, Ostridae, Nuculunidae, Thyasiridae.