Short communication. The effect of temperature, food concentration and female size on the egg production of the planktonic copepod Acartia bifilosa |
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Authors: | Koski M; Kuosa H |
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Institution: | 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 |
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Abstract: | 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 4-24 C), 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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