| Summary: | 15 pages, 6 figures, 1 table [EN] The spatial distribution of the particulate organic nitrogen and the dissolved organic nitrogen (NOD) has been studied in the sea water in a North-South cut in the Western Indian Ocean from 24º to 52º east longitude, from the subtropical convergence, 42º S, to the Red Sea entry, 15º N. It has been verified tahat aunder 400 m the DON is a characteristic of the water masses, the Intermediate Antartic Water having the highest value and the lowest values being found in the zones from the Red Sea, the Equatorial and the upper deep water one mix. In deep water the DON can clearly distinguish the differences in water masses which are hardly different in their values of T.-S. The most typical of all of them is the deep water of the Arabian Sea having extremely low values of DON. The distribution of DON in the upper layer of the equatorial zone found by the "Magga dan" during the North East monsoon has been compared with that found formerly by the R/V "Anton Bruun" at the end of the South West monsson and remarkable differences were found in agreement with the monsoon wind patterns [ES] En la comunicación anterior, FRAGA (1966), se dio a conocer la distribución espacial del nitrógeno orgánico disuelto y del particulado en un corte vertical desde 25º lat. N a 20º lat. S, entre los meridianos 55º a 65º E. [.] Peer reviewed
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