Seasonal variations and distribution of sea grass associated macrofauna in Uppanar estuary, southeast coast of India

The occurrence of sea grass in relation to the distribution, relative abundance and seasonal variations along with the Physio-chemical parameters influencing the growth and distribution of associated fauna in Uppanar estuary, have been studied for a period of one year from April 2005 to March 2006. Totally three species of sea grass were collected. The sea grass showed definite levels of zonation. They also showed seasonal changes in growth pattern in relation to the changes in Physio-chemical parameters. Totally about three major groups of organisms i.e. Polychaetes, Crustaceans and Molluscs were recorded. The Molluscans were the most dominant organisms amounting to 41% and between this, Polychaetes above contributed to the tune of 37%. Crustaceans 19% and others 3%. The study area water quality parameters are favorable for juvenile and existence of different biotic communities in the estuary