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JOURNAL OF PLANKTON RESEARCH | VOLUME 14 | NUMBER 2 | PAGES 249-259 | 1992
© Oxford University Press

research-article

Diel feeding and vertical migration of Sagitta serratodentata Krohn tasmanica Thomson (Chaetognatha) in the southern Benguela

M.J. Gibbons

Marine Biology Research Institute, Zoology Department, University of Cape Town, Rondebosch 7700 and Sea Fisheries Research Institute, Private Bag X2, Roggebaai 8012, Cape Town, South Africa

Received on December 18, 1990; accepted on July 22, 1991 The migration and diel feeding of Sagitta serratodentata tasmanica were investigated at two stations in the southern Benguela. Pronounced diel migration and feeding was observed offshore where the food environment was markedly stratified. The inshore population, because of the shallow bottom, did not migrate out of their prey field and did not exhibit a pronounced diel feeding pattern. Copepods comprise almost the entire diet of both populations and, although Centropages brachiatus was heavily selected for, the data do not differentiate between size or species selection.


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