Spatial comparison of Lead concentration in sediment and three group of macrobenthos (Crabs, Gastropods and Bivalves) in coast of Bandar Abbass

This is confirmed that bacteria and other living organisms are not able to decompose or excrete the heavy metals, so heavy metals concentrate and accumulate in their tissues and cause toxicity in other organisms in high levels of food chain via biomagnifications and transfer by organisms to the intermediate levels of food chain for instance macrobenthos. Mean concentration of lead was estimated in sediment and also in three groups of macrobenthose in five areas in coast of Bandar Abbass. Results showed that the mean concentration of the Lead in sediments was from 0.359 ppm in Goorsozan estuary to 0.216 ppm in Posht-e-Shahr. Lead concentration in crab was maximum in Goorsoozan estuary with 0.470 ppm and minimum in Posht-e-shahr with 0.270 ppm. Bivalvia with 0.300 ppm in Bahonar Jetty and 0.250 ppm in Goorsoozan estuary obtained maximum and minimum concentration of Lead, respectively. Gastropoda obtained 0.150 ppm of Pb in Getty Bahonar and 0.039 ppm in Goorsoozan estuary. The results confirmed that Lead concentration was in order of Crabs > Gastropoda > Bivalvia. Spatial comparison of Lead concentration showed that sediment and crabs obtained high concentration of Lead in Goorsoozan estuary, while Gastropoda and Bivalvia obtained high concentration of Lead in Jetty Bahonar. The significant coefficient of Lead concentration between sediment and crab indicated that crabs bioaccumulate Lead from sediment directly but lack of significant coefficient between Gastropoda and Bivalvia with sediment showed these organisms bioaccumulate Lead from other sources of sediment for instance water.