Abstract
Determinations were made of particulate and dissolved organic nitrogen in the waters of the western Indian Ocean from 20°S to 25°N. The vertical distribution of particulate nitrogen had a maximum at ten meters and a very clear diurnal variation extending down to 340 m. During the night the nitrogen increased from 0 to 60 m and decreased from 60 to 340 m. It is supposed that this is due to zooplankton migration. The vertical distribution of the dissolved organic nitrogen had a peak at 20 m and another very large one between 100–170 m. The relationships were studied between dissolved nitrogen, dissolved organ ic carbon, particulate nitrogen, and also particulate carbon and phosphorus, chlorophyll and the fixation of carbon-14. The distribution of organic nitrogen is shown for a north-south section and for sections perpendicular to the Arabian coast.
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