JPR Advance Access published online on September 20, 2006
Journal of Plankton Research, doi:10.1093/plankt/fbl047
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1 National Oceanography Centre, Southampton, University of Southampton, Waterfront Campus, Southampton, SO14 3ZH, United Kingdom; Current address: Oceanlab, University of Aberdeen, Main Street, Newburgh AB41 6AA, United Kingdom
* To whom correspondence should be addressed. Simultaneous ingestion and egg production experiments were conducted with female Calanus finmarchicus in April/May and July/August 2002 in the Irminger Sea. Experimental animals were provided with natural microplankton food assemblages and incubated under in situ conditions for 24 h. The quantity of food consumed was significantly related to the concentration of prey cells, with total daily ingestion rates ranging between 0.6 and 8.1 µg carbon female-1 d-1, corresponding to carbon-specific rates of between 0.6 and 4.7 % d-1. Egg production rates remained relatively low (0.3 - 11 eggs female-1 d-1) during both periods of investigation, and were not influenced by food availability. The data were used to construct energetic budgets in which the microplankton carbon ingested, including ciliates, was compared to the carbon utilised for egg production and respiration. These budgets showed that ingestion alone could not provide the necessary carbon to sustain the observed demands for growth and metabolism. Although ciliates constituted > 80 % of the total material ingested at times, they were not sufficient to provide the metabolic shortfall. Indeed, the females were typically lacking around 5 µg of carbon each day, approximately 5 % of their carbon biomass. Our results highlight the possible importance of internal reserves in sustaining reproduction in C. finmarchicus during periods of food scarcity Communicating Editor: KJ Flynn
Received June 23, 2006
Accepted September 15, 2006
Article
Feeding and reproduction of Calanus finmarchicus during non-bloom conditions in the Irminger Sea
Daniel J. Mayor 1 *, Thomas R. Anderson 2, Xabier Irigoien 3, and Roger Harris 4
2 National Oceanography Centre, Southampton, University of Southampton, Waterfront Campus, Southampton, SO14 3ZH, United Kingdom
3 AZTI, Herrera Kaia Portualdea, Z/G, 20110 Gipuzkoa, Spain
4 Plymouth Marine Laboratory, Prospect Place, Plymouth, PL1 3DH, United Kingdom
Daniel J. Mayor, E-mail: dan.mayor{at}abdn.ac.uk
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