%0 Journal Article %T Polychaeta Organism Density in Na Thap Estuary %A Chokchai Lueangthuwapranit %A Niwadee Saheem %J International Journal of Biology %D 2011 %I %R 10.5539/ijb.v3n4p30 %X Polychaeta is a class of macrobenthic fauna found in marine and estuarine environments. As part of a larger study of environment health impacts associated with the operation of a thermal power plant in the Na Thap River in Songkhla, Thailand, we examined bi-monthly organism densities of Polychaeta measured at each of five sites along the river downstream from the power plant for before and after its operation began. These densities, after log-transformation to reduce skewness with appropriate handling of zeroes, were found to be related to salinity measured at the same sites on the same occasions. There was also a statistically significant trend in the Polychaeta densities over the whole period. %U http://www.ccsenet.org/journal/index.php/ijb/article/view/10872