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Diel vertical migration of the 2 most common chaetognaths (Sagitta friderici and S. tasmanica) In the southern Benguela was investigated at two 72 h stations during summer 1991. Feeding was examined over 24 h windows in these data sets. Both species exhibited die1 vertical migration, although this was not obvlous from changes in the mean depth occupled by night and day. Both species fed maximally at night in the upper layers before moving to deeper water to digest their food. Their diets were composed almost exclusively of copepods, and size preferences were exhibited by each species. The chaetognaths were segregated along a number of niche axes: viz. depth, time of maximal feehng and diet itself. It is suggested that competition between chaetognaths may have been high during periods of prolonged quiescence and mismatch, and that resource partitioning in a persistent guild has evolved to mitigate this. This alters the concept of zooplankton communities in upwelling regions as being exclusively physically structured. Although comparisons between the diets of chaetognaths and of the other first-order carnivore, Euphausia lucens, reveal similar partitioning of copepod prey, this structure cannot be interpreted in terms of historic competition but rather reflects differential mechanisms of resource acqulsltion

marine ecology. progress series

Diet vertical migration and feeding of Sagitta friderici and Sagitta tasmanica in the southern Benguela upwelling region, with a comment on the structure of the guild of primary carnivores