Phosphorus fractions in Gulf of Mannar and their relation to organic production

Abstract

The variations of the three phosphorus fractions—inorganic, organic and particulates have been discussed in relation to the primary production in Gulf of Mannar off Mandapam. Though the rate of primary production is uniformly high, instantaneous concentration of inorganic P is low and without significant seasonal variation. But the total P, dissolved organic P and particulate P show definite seasonal variation. From primary production the rate of phosphate assimilation and regeneration have been deduced.