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Population dynamics of Calanus chilensis in the Chilean Eastern Boundary Humboldt Current
Author(s) -
ESCRIBANO RUBEN
Publication year - 1998
Publication title -
fisheries oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 80
eISSN - 1365-2419
pISSN - 1054-6006
DOI - 10.1046/j.1365-2419.1998.00078.x
Subject(s) - upwelling , calanus , oceanography , calanus finmarchicus , population , boundary current , advection , zooplankton , current (fluid) , diel vertical migration , submarine pipeline , environmental science , biology , fishery , ecology , copepod , ocean current , crustacean , geology , demography , physics , sociology , thermodynamics
A study of the population dynamics of Calanus chilensis was carried out in the coastal area of the Mejillones Peninsula (23°S), which is an upwelling site in the Eastern Boundary Humboldt Current. Information was derived from time‐series sampling (15 day interval) at three stations, and from two broad‐scale cruises: under active upwelling, and under 1997/1998 El Niño conditions. Calanus chilensis showed continuous reproduction throughout the year. In the study area, upwelling takes place intermittently year‐round, suggesting that Calanus production is not limited by food. Advection played an important role in structuring the spatial distribution of Calanus , both during upwelling and under El Niño conditions. Population losses from upwelling and offshore transport may be compensated by rapid turnover rates of cohorts, growing at temperature‐dependent rates and hence allowing population recovery, even in abnormally warm waters during El Niño conditions.