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JPR Advance Access originally published online on July 27, 2005
Journal of Plankton Research 2005 27(8):735-742; 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.

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 Irigoien1,*, Hans M. Verheye2, Roger P. Harris3 and Derek Harbour3

1 Azti, Herrera Kaia Portualdea Z/G, 20110 Pasaia, Spain, 2 Marine & Coastal Management, Private Bag X2, Rogge Bay 8012, Cape Town, South Africa and 3 Plymouth Marine Laboratory, Prospect Place, Plymouth PL1 3DH, UK

* Corresponding Author: xirigoien{at}pas.azti.es

Received December 15, 2004; accepted in principle June 3, 2005; accepted for publication July 8, 2005; published online July 27, 2005

We have analysed the daily egg production (EPR) 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 EPR variability. We found no relation between the residuals of the food concentration–EPR 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).


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