Abstract
The size fractionation of particulate matter (<200, <35, <3 and <1 am) has been measured in the Equatorial Atlantic Ocean at different stations. Chlorophyll u, phaeophytin, par- ticulate carbon, nitrogen and phosphorus have been analysed. Primary production by 14C02 uptake was also measured with prescreening technique. It appears from this study, that the particulate matter has a very small size: 40-60% of the chlorophyll passed through 1 pm Nucleopore filter, and 75-90% of the particulate carbon and nitrogen passed through 3 pm Nucleopore filter in offshore waters. From the atomic ratio C/N, C/P and C/chla, and primary production values, the < 3 Fm fraction would be mainly constituted by inactive photosynthetic organisms or particles of detritus. The 3-35 pm fraction, in contrast, would be principally active phytoplankton.
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