TY - JOUR
T1 - Evolution and biological effects of the 1997-98 El Niño in the upwelling ecosystem of northern Chile
AU - Ulloa, Osvaldo
AU - Escribano, Ruben
AU - Hormazabal, Samuel
AU - Quiñones, Renato A.
AU - González, Rodrigo R.
AU - Ramos, Marcel
PY - 2001/4/15
Y1 - 2001/4/15
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=0035870462&partnerID=8YFLogxK
U2 - 10.1029/2000GL011548
DO - 10.1029/2000GL011548
M3 - Article
AN - SCOPUS:0035870462
SN - 0094-8276
VL - 28
SP - 1591
EP - 1594
JO - Geophysical Research Letters
JF - Geophysical Research Letters
IS - 8
ER -