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Volume 36- Number 2 - 2001

Daily fluctuation of phytoplankton in the upper layer of the ocean during the spring of 1997 in the north of Chile (20°18'S): I. Pigment biomass

Edgardo Santander, Liliana Herrera & Jessica Pizarro


Universidad Arturo Prat , Departamento de Ciencias del Mar, Casilla 121, Iquique, Chile




The response of phytoplanktonic biomass to the changes in the physical and chemical structure produced by an upwelling event is analyzed in a daily scale. The results show a physical-chemical coupling, and a high spatial and temporal variability in the chlorophyll concentration. The response of chlorophyll was characterized by a two or three days lag to favorable conditions, and a change in the phytoplanktonic fractions responsible of the most important concentration was observed.
The study period coincided with “El Niño” 1997-1998 presence, but the results do not show anomaly conditions associated with this event.


Key words: Pigmentary biomass, upwelling, physics and chemical environment, ENSO




1Laboratorio de Zooplancton, Instituto de Ciencias del Mar y Limnología,Universidad Nacional Autónoma de México. A. P. 70-305, 04510 México, D. F. México
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