Estuarine ecosystem serves as a living buffer between land masses and the open sea. It filters the drain water from the land masses and restores the nutrients. Different halophytes constituting this ecosystem follow an efficient modified C₄ path of carbon assimilation.

Preliminary study in the nitrogen dynamics of this productive ecosystem was carried out during present investigation. Total nitrogen, protein content and nitrate reductase activity was estimated in mangroves. The soil and water surrounding the root zone was also analysed for nitrogen content. The results are discussed in light of protein content and the path of carbon assimilation.