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JOURNAL OF PLANKTON RESEARCH | VOLUME 3 | NUMBER 4 | PAGES 659-673 | 1981
© Oxford University Press

research-article

The size distribution of phytoplankton and participate organic matter in the Equatorial Atlantic Ocean: importance of ultraseston and consequences

Alain Herbland and Aubert Le Bouteiller

Antenne Orstom, Centre Océanologique de Bretagne BP 337, 29273 Brest Cedex, France

Received on October 1, 1980; accepted on May 1, 1981 The size fractionation of paniculate matter (<200, <35, <3 and <1 µm) has been measured in the Equatorial Atlantic Ocean at different stations. Chlorophyll a, phaeophytin, particulate carbon, nitrogen and phosphorus have been analysed. Primary production by 14CO2 uptake was also measured with prescreening technique.

It appears from this study, that the pariculate matter has a very small size: 40–60% of the chlorophyll passed through 1 µm Nucleopore filter, and 75–90% of the paniculate carbon and nitrogen passed through 3 µm Nucleopore filter in offshore waters.

From the atomic ratio C/N, C/P and C/chla, and primary production values, the <3 µm fraction would be mainly constituted by inactive photosynthetic organisms or partides of detritus. The 3–35 µm fraction, in contrast, would be principally active phytoplankton.


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