![]() man-made and natural processes are the major en-route to the heavy metal contamination in the aquatic habitats including in the coastal sediments. In addition to that urbanization, industrial and agricultural activities could also favours the contamination of soil by heavy metals ( Heba et al., 2000). The sediments received the heavy metals through chemical and physical processing of rocks, percolating of soil and physiological process of various plants ( Al-Saad et al., 1997). The heavy metals are badly affecting the aquatic habitats and which is becomes a big threat since most of the heavy metals are severe toxic effects on several organisms ( MacFarlane and Burchett, 2000). The heavy metals are one among the serious pollution in the aquatic habitats since these heavy metals are flexible to enter the food chain of an aquatic ecosystem ( Censi et al., 2006, Pandiyan et al., 2020). But recently several wetlands are under severe threats due to various pollutants ( Agoramoorthy and Pandiyan, 2015). Nevertheless the coastal wetland habitats including intertidal mudflats are functioning as a proper shelter, feeding and breeding grounds for various species ( Balachandran, 2012, Sivaperuman and Venkatraman, 2014). The wetlands habitats are most productive ecosystem in the world, providing suitable habitats for various species of aquatic organisms which are depends on it. The study found that the level of heavy metals at various sources in the sanctuary is showing considerable warning and the sanctuary is required intensive assessment on various aspects of pollution since the Point Calimere Wildlife Sanctuary is supporting several species of migratory and endangered shorebirds seasonally. Indeed the multiple regression model explained that the metals of sediments influence the accumulation of metals in biotic species such as polychaetes, molluscs, crustaceans, prawns and fishes with 84% (F = 21.079 p Pb > Ni > Cr > Zn > Co > Cu > Cd. In addition to that the metals of prawns was correlated with the polychaetes (r = 839), crabs (r = 0.628) and molluscs (r = 0.634). ![]() However, correlation of metals among the different sources shown that the metals of polychaetes correlated with sediment r = 0.637, the metals of crabs correlated with the sediment and polychaetes r = 0.630 and r = 842 respectively, the metals of molluscs was also correlated with sediment (r = 0.636), polychaetes (r = 0.889) and crabs (r = 0.894). The Zinc was correlated with the Cd (r = 0.331) and Hg (r = 0.737). However, the Cu and Co were correlated with Hg (r = 0.307) and (r = 0.788) respectively. The inter-correlational analysis among the metals assessed from the various sources showed that the Cr and Pb not correlated among the eight metals examined. The concentration of metals showed significant differences among the various sources examined (P 0.05). However, the Cu and Pb greater in crabs and the Zinc was greater in fishes. ![]() The Hg, Cr and Co were greater in sediment, Ni and Cd were higher in polychaetes and molluscs respectively. The assessment of heavy metals was done by using double-beam Atomic Absorption Spectrophotometer (AAS). The cadmium (Cd), copper (Cu), chromium (Cr), cobalt (Co), lead (Pb), mercury (Hg), nickel (Ni) and zinc (Zn), were assessed in the water, sediment, benthic species (polychaetes, mollusc and crustaceans), prawn and fishes. ![]() Heavy metals are one among of the major pollutants in wetland habitats. Pollution is severely threatening the wetland habitats.
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