Journal
ICES JOURNAL OF MARINE SCIENCE
Volume 57, Issue 6, Pages 1752-1763Publisher
ACADEMIC PRESS LTD
DOI: 10.1006/jmsc.2000.0960
Keywords
Calanus spp.; copepods; sex ratio
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The effect of food concentration on the sex ratio in Calanus spp, has been investigated in laboratory and mesocosm experiments. The results of the experiments are compared with time series in the field and with physiological rates. The food concentration and quality had an effect on the sex ratio of adult Calanus, with higher percentages of males obtained with increased food concentration. Laboratory experiments and field time series suggest that sex can still change at stage CIII-CIV, but is determined at stage CV. The energy budget of males was very unbalanced, suggesting that the shorter lifespan often reported could be due to exhaustion of lipid stores.
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