Abstract
An attempt has been made to study the chemical partition of nitrogen in eleven species of seaweeds belonging to the three major groups, Chlorophyceae, Rhodophyceae and Phaeophyceae. The seasonal variations in the total organic, water-soluble, volatile, protein and non-protein nitrogen contents were followed by analysing regular monthly collections of the algae. The importance of each of the fraction in the metabolism of the algae has been discussed. It is observed that the seaweeds are poor in their total nitrogen content, the values never exceeding 2% on the dry basis. In species likeG. lichenoides the total nitrogen content shows an inverse ratio to that of the agar content. Protein nitrogen is less in young plants, while in the mature plants it accounts for more than 75% of the total organic nitrogen. Water-soluble and volatile nitrogen content also follows the total nitrogen giving maximum values in September–December and minimum in July.
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