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JOURNAL OF PLANKTON RESEARCH | VOLUME 3 | NUMBER 4 | PAGES 577-592 | 1981
© Oxford University Press

research-article

Relationships between the hydrological structure, chlorophyll and zooplankton biomasses in the Gulf of Guinea

Robert Le Borgne

Antenne O.R.S.T.O.M. au C.O.B. BP 337, 29273 Brest Cedex, France

Received on November 1, 1980; accepted on April 1, 1981 In the deep-sea part of the Gulf of Guinea, zooplankton dry weights (D.W.)are negatively correlated with the top of the nitrate gradient (DNO3) or the shallowest undersaturated oxygen level (Dox). This is the consequence of a two-fold relation: the integrated chlorophyll, Chl ai, vs. DNO3 or Dox relation in typical tropical structures (i.e. with no nitrate in the mixed layer) and the linear relation between D.W. and Chl ai, for offshore oligotrophic areas and the equatorial divergence as well. However this D.W.-Chl ai relation is not valid any more in the Mauritanian coastal upwelling. This point is discussed together with that of the respective vertical distributions of zooplankton and chlorophyll and the limits of the studied relations.


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