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The fecundity and somatic growth rates of Calanus agulhensis and Calanoides carinatus, the dominant large calanoid copepods in the southern Benguela upwelling system, as well as the fecundity of several other common copepods, were measured between September and March of 1993/94 and 1994/95. Mean egg production of most copepods was low at 10 mu m) and temperature to the growth of copepods.' Multiple regression results suggested that fecundity and somatic growth rates were positively related to both Chi a concentration and phytoplankton cell size, but not to temperature. Although it was not possible to separate the effects of Chi a concentration and phytoplankton cell size, data from previous laboratory experiments suggest that copepod growth is not limited by small cells per se, but by the low Chi a concentrations that are associated with these particles in the field. Despite growth not being directly related to temperature, a dome-shaped relationship was evident in some species, with slower growth rates at cool ( 18 degrees C) temperatures. The shape of this relationship mirrors that of Chi a versus temperature, where poor Chi a concentrations are associated with cool and warm temperatures. It is concluded that the effect of food limitation on growth of copepods outweighs that of temperature in the southern Benguela region. Sources of variability in relationships between growth and Chi a concentration are discussed.

The relative importance of food and temperature to copepod egg production and somatic growth in the southern Benguela upwelling system