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JOURNAL OF PLANKTON RESEARCH | VOLUME 4 | NUMBER 2 | PAGES 341-361 | 1982
© Oxford University Press

research-article

The role of amino acids in the chemosensory swarming and feeding of marine copepods

S.A. Poulet1 and G. Ouellet

Laboratoire d'Océanologie, Institut National de la Recherche Scientifique Rimouski, Québec, G5L 3AI, Canada

1To whom reprint requests should be sent at present address: Centre d'Etudes d'Océanographie et de Biologie Marine, CNRS, Station Biologique, 29211 Roscoff, France

Received on June 1, 1981; accepted on December 1, 1981 Behavioural observations were made on two copepods, Eurytemora herdmani and Acartia hudsonica, presented with 18 dissolved L-amino acids the concentrations of which ranged from 10–8 M to 10–2 M. The onset and duration of the swarming behaviour were determined by the structure and concentration of a restricted number of molecules, which differed depending on the copepod species. Dicarboxylic amino acids were the most stimulatory agent for E. herdmani, whereas A. hudsonica responded preferentially to aliphatic amino acids. Both the feeding and swarming of A. hudsonica could be induced by the same kind of molecules. The threshold sensitivity of the copepods appeared to be compatible with the natural concentrations of the dissolved free amino acids measured at sea. These findings are discussed with reference to the chemically mediated interactions between phytoplankton and zooplankton.


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