Evolution and biological effects of the 1997-98 El Nino in the upwelling ecosystem off northern Chile

Ulloa, O.; Escribano R.; Hormazabal, S; Quiñones, RA; González RR; Ramos M.

Abstract

During the 1997-98 El Niño event, the temperature and oxygen contents of the coastal waters off northern Chile were noticeably higher than during non-El Niño conditions, but phytoplankton and zooplankton biomasses were not dramatically altered. In contrast, the herbivorous copepod Calanus chilensis, which showed a limited tolerance to low-oxygen conditions: exhibited greater abundances, higher growth rates, and a significant reduction in adult body size. These results indicate a positive effect of the changes in oceanographic conditions due to El Niño on zooplankton growth and production, and provide evidence for lack of food limitation on secondary production in the coastal region during this period.

Más información

Título según WOS: Evolution and biological effects of the 1997-98 El Nino in the upwelling ecosystem off northern Chile
Título según SCOPUS: Evolution and biological effects of the 1997-98 El Niño in the upwelling ecosystem of northern Chile
Título de la Revista: GEOPHYSICAL RESEARCH LETTERS
Volumen: 28
Número: 8
Editorial: American Geophysical Union
Fecha de publicación: 2001
Página de inicio: 1591
Página final: 1594
Idioma: English
URL: http://doi.wiley.com/10.1029/2000GL011548
DOI:

10.1029/2000GL011548

Notas: ISI, SCOPUS