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JPR Advance Access published online on April 27, 2004
Journal of Plankton Research, doi:10.1093/plankt/fbh087
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Received December 19, 2003
Accepted April 15, 2004

Article

Calanus the cannibal

Delphine Bonnet 1*, Josefin Titelman 2, Roger Harris 1

1 Plymouth Marine Laboratory, Prospect Place, Plymouth PL1 3DH, UK
2 Plymouth Marine Laboratory, Prospect Place, Plymouth PL1 3DH, UK; Present address: University of Bergen, Department of Fisheries and Marine Biology, PO Box 7800, N-5020 Bergen, Norway

* To whom correspondence should be addressed. E-mail: BODE{at}mail.pml.ac.uk.


  Abstract

Recent modelling efforts have suggested that cannibalism on eggs and young nauplii are an important factor controlling the population dynamics of Calanus. We measured cannibalistic feeding rates on eggs and nauplii of Calanus helgolandicus in the laboratory. Clearance rates on nauplii were around 102 mL ind-1 d-1, while generally higher on eggs (320 mL ind-1 d-1). Female starvation did not affect ingestion rates of eggs. We discuss our results in light of published model predictions, cannibalistic feeding rates of other copepods, and field distributions of Calanus developmental stages.


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