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Journal of Plankton Research, Vol 21, 1779-1789, Copyright © 1999 by Oxford University Press

ORIGINAL ARTICLES

Short communication. The effect of temperature, food concentration and female size on the egg production of the planktonic copepod Acartia bifilosa

M Koski and H Kuosa
Tvarminne Zoological Station, FIN-10900 Hanko, Finland; Finnish Institute of Marine Research, PO Box 33, FIN-00931, Finland; Corresponding author at: Department of Ecology and Systematics, Division of Hydrobiology, PO Box 17, FIN-0014 University of Helsinki, Helsinki, Finland

Egg production of a brackish water calanoid copepod Acartia bifilosa was measured in the laboratory in different chlorophyll (Chl) a concentrations (0-24 mgr; l-1) and temperatures 4-24C), and the cephalothorax length and carbon content of females were determined. Egg production was positively correlated both with Chl a concentration and with temperature; highest egg production was obtained with 14-20 g Chl a l-1 and at 13-18°C. There was also a significant positive correlation between egg production and female length-specific carbon content (g C m-1). However, no correlation was observed between egg production and cephalothorax length of females. Female carbon content changed during the 3 day experiments; carbon content was positively related to Chl a concentration and negatively related to temperature. We conclude that food availability (Chl a concentration), rather than temperature, limits the egg production of A.bifilosa in the present study area in the northern Baltic Sea. Further, both food concentration and temperature affect egg production not only through the direct effect on the numbers of eggs produced per female, but also through their effect on female carbon content.
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Home page
 J PLANKTON RESHome page
T. Katajisto
Development of Acartia bifilosa (Copepoda: Calanoida) eggs in the northern Baltic Sea with specialreference to dormancy
J. Plankton Res., April 1, 2003; 25(4): 357 - 364.
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