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Volume 36- Number 2 - 2001
Article


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

 

E-mail: esantan@cec.unap.cl

 

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

 

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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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