التركيب النوعي لتجمعات بطنيات القدم Assemblages Gastropoda وانواعها المهاجرة والاقتصادية في عدة مواقع من الشاطئ السوري

This research deals with comparable study of the specific composition of assemblages gastropoda and migratory species in four regions of Syrian coast, which differed by substrate nature and their exposure to pollution resources and rivers estuaries, They are as fallow:The Southern Region of Lattakia, AL Bhyss and AL Moelh South of Jableh, Estuary Assin. This research was done between April 2010 and April 2011. The samples were collected from the supralittoral ,littoral and sublittoral regions at depth 3m. Results revealed the following: The number of gathered species of gastropoda were 161 species, and the southern region species were of more Biodiversity are the number in which 113 species, followed by the Estuary Assin region with species 103, followed by the AL Bhyss region with 70, while the number of species in the region AL Moelh was 59. The number of migratory species were 104 species 73 of them were recorded for the first time in our waters, including 57.5% Indo-Pacific species and 38% of West Mediterranean - Atlantic and 2.7% of the Arab Sea and the Gulf of Oman and 1.3% from the Black Sea. The number of economically important species which reared in several countries of the world were 33 species. 73 new species were added to benthic marine bio-diversity in the Syrian regional waters from the eastern basin of the Mediterranean sea.