The Effect of Environmental Parameters (Depth and Sediment) on the Benthic Molluscs Density and Diversity in the the crater of Nayband Bay

In order to investigate the sedimentary texture, diversity and density of benthic molluscs, 55 stations at 9 transect were collected in the Nayband Bay.Samples were taken with a Van Veen grab (0.022 m2) in 3 replications in each site.Using a Particle Size Analyzer instrument revealed that the sediment texture was dominated by sand with 7 sub distinct sub sediment. Semelidae,Veneridae and Tellinidae families belonged to bivalves were dominant families in all identifeid molluscs. In this region,sediment particle size and depth variations had significant effects on species distribution, richness and eveness.The diversity, species richness and abundance of Mollusc increased with depth Increasing.The mean value of Margalef and Shannon index interpreted the study area as contaminated region while the Pielu index described the environment without stress.