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Journal of Plankton Research Vol.22 no.4 pp.603-617, 2000
© Oxford University Press 2000

Microplankton distribution in the Strait of Gibraltar: coupling between organisms and hydrodynamic structures

Fernando Gómez, Fidel Echevarría, Carlos M. García, Laura Prieto, Javier Ruiz, Andreas Reul1, Francisco Jiménez-Gómez1 and Manuel Varela2

Area de Ecología, Facultad de Ciencias del Mar, Universidad de Cádiz, 11510, Puerto Real, Cádiz, 1 Departamento de Ecología, Facultad de Ciencias, Universidad de Málaga and 2 Instituto Español de Oceanografía, Centro Costero de La Coruña, Spain

In this paper we present microplankton distribution patterns in the Strait of Gibraltar obtained during a cruise carried out in September 1997. Chlorophyll, microplankton abundance and biovolume increase from southwest to northeast, a tendency that coincides with a gradual elevation of the interface depth in the same direction. The vertical distribution of biomass at the different stations shows deep maxima associated with the pycnoclines. The generation of internal waves and eventual intrusion of deep water on the sill can be decisive in the enrichment of surface water and plankton dynamics. The taxonomic structure agrees with the expected pattern, with a predominance of diatoms in the richer Mediterranean stations (especially in the north) and a predominance of dinoflagellates and microzooplankton at the Atlantic side. Phytoplankton distribution and salinity values found in the Strait of Gibraltar can be explained by a preliminary model that assumes a coupling between diatom life cycles and hydrodynamic features. Thus, the cells in the surface waters of the eastern side of the Strait would aggregate and sink below the interface, moving westwards and returning to the surface waters coupled with the rising and mixing of deep Mediterranean water at the sill.


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