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JPR Advance Access published online on June 21, 2007
Journal of Plankton Research, doi:10.1093/plankt/fbm056
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Published by Oxford University Press 2007

Naupliar development times and survival of the copepods Calanus helgolandicus and Calanus finmarchicus in relation to food and temperature

K.B. Cook1, A. Bunker2, S. Hay1, A.G. Hirst3 and D.C. Speirs4

1 FRS Marine Laboratory, PO Box 101, Victoria Road, Aberdeen, AB11 9BD, UK 2 Heriot-Watt University, School of Life Sciences, John Muir Building, Edinburgh, EH14 4AS, UK 3 British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge, CB3 0ET, UK 4 Department of Statistics and Modelling Science, University of Strathclyde, Glasgow, G1 1XH, UK,

Received on January 31, 2007; revised on April 12, 2007; accepted on June 19, 2007


  Abstract

We measured egg hatching times and stage specific naupliar development times of the key calanoid copepods C. helgolandicus and C. finmarchicus in response to temperature, food quantity and food type. C. helgolandicus development times decreased with increasing temperature and when fed Isochrysis galbana (4.4µm ESD) rather than Prorocentrum micans (29.5µm ESD). Nauplii needed higher food carbon concentration to develop past the first feeding stage (N3) when fed I. galbana compared with P. micans. At low food carbon concentrations nauplii developed more slowly past N3 than at more saturated levels. The survival of nauplii fed P. micans increased with temperature, but starved nauplii survival decreased at higher temperatures. We parameterised a temperature-dependent model of development for both species which fitted the observed stage durations under non-limiting food extremely well and demonstrated that C. finmarchicus develops faster than C. helgolandicus. Further data is needed to clarify the effect of food-temperature interactions on development rates.

Key Words: Calanus • Development rate • Hatching rate • Survival • Temperature-dependent

Communicating Editor: R.P. Harris


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