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JOURNAL OF PLANKTON RESEARCH | VOLUME 13 | NUMBER 5 | PAGES 1093-1099 | 1991
© Oxford University Press

research-article

Marine phytoplankton: how many species in the world ocean?

A. Sournia, M.-J. Chrdtiennot-Dinet1 and M. Ricard2

1Observatoire Océanologique de Banyuls, Laboratoire Arago 66650 Banyulus-sur-mer 2Laboratoire de cryptogamie, Mustum national d'histoire naturelle 12, rue de Buffon, 75005 Paris, France Observatoire Odanologique de Roscoff, c/o Laboratoire de géologie, Museum national d'histoire naturelle 43, rue de Buff on, 75005 Paris

Received on December 17, 1990; accepted on March 20, 1991 Towards the end of the 1980s, living plankton flora of the world ocean amounted to 474-504 genera and 3444–4375 species if one neglects the increase rate of taxa during the latest years In the above figures, the lower estimate is that of the ‘reliable’ taxa (of practical value for identification tasks), whereas the higher estimate includes the insufficiently known or doubtful organisms, and synonyms are excluded. The frequency distribution of the numbers of species per genus confirms the general hyperbolic law, which implies that a relatively large number of genera are uni- or paucispecific.


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