In the present study we evaluate the intertidal distribution of polychaete communities allied with the physicochemical parameters and to impact on the ecosystem health to presence of heavy metals contents are influenced with occurrence of the polychaetes. Totally 828 of individuals belonging to eight polychaete genus were collected from the four dissimilar stations of around Vellar estuaries. Among this populations ranged from 8.81 - 17.27%. In terms of species individuals establish all the station varied between 1.57 (S4) - 6.03 (S3) for the responsibility of physicochemical parameters. The sediments compositions of ranged 40±5.50 - 71±0.57, silt 23±0.57 - 37±1.15 and clay 5.6±0.66 - 28±9.2 in the all station. Entire sampling site Fe was maximum and Cd was minimum contents are determine to substantiating the conditions of the ecosystems. The multivariate analyses are concluding the linkage of these factors and animal abundant through the parallel findings and this level was assist to accrue the availability of polychaetes distribution and the environmental variables are strongly correlated with animal population (P< 0.05), in conclusion the species distribution are determine the concentrations of trace metal and defend the ecosystems.
