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JPR Advance Access published online on July 27, 2005
Journal of Plankton Research, doi:10.1093/plankt/fbi046
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oupjournals.org
Received December 15, 2004
Accepted July 8, 2005

Article

Effect of food composition on egg production and hatching success rate of two copepod species (Calanoides carinatus and Rhincalanus nasutus) in the Benguela upwelling system

Xabier Irigoien 1*, Hans M. Verheye 2, Roger P. Harris 3, and Derek Harbour 3

1 AZTI, Herrera Kaia portualdea z/g 20110 Pasaia, Spain
2 Marine & Coastal Management, Private Bag X2, Rogge Bay 8012,Cape Town, South Africa
3 Plymouth Marine Laboratory, Prospect Place, Plymouth PL1 3DH, UK

* To whom correspondence should be addressed.
Xabier Irigoien, E-mail: Xirigoien{at}pas.azti.es


  Abstract

We have analysed the daily egg production and hatching success rates of the calanoid copepods Calanoides carinatus and Rhincalanus nasutus as a function of nano- and microplankton concentration and composition in the northern Benguela upwelling system off Namibia. Food concentration explained 55% (R. nasutus) to 62% (C. carinatus) of the egg production variability. We found no relation between the residuals of the food concentration - egg production regression and the percentage of the different taxonomic components of the nano- and microplankton. Nor was there a relation with the proportion of the diatom Skeletonema costatum that dominated the major blooms or with the number of nano- and microplankton species. We conclude that food quality differences could not be attributed to the relative composition of microplanktonic particles of the different groups (i.e. taxonomic composition).

Keywords: Calanoides carinatus, Rhincalanus nasutus, Skeletonema costatum, egg production, egg hatching rate, Benguela upwelling.
Communicating Editor: KJ Flynn
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