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The Strathprints institutional repository is a digital archive of University of Strathclyde research outputs.

Strathprints serves world leading Open Access research by the University of Strathclyde, including research by the Strathclyde Institute of Pharmacy and Biomedical Sciences (SIPBS), where research centres such as the Industrial Biotechnology Innovation Centre (IBioIC), the Cancer Research UK Formulation Unit, SeaBioTech and the Centre for Biophotonics are based.

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The effect of food on the determination of sex ratio in Calanus spp.: evidence from experimental studies and field data

Irigoien, X. and Obermuller, B. and Head, R.N. and Harris, R.P. and Rey, C. and Hansen, B.W. and Hygum, B.H. and Heath, M.R. and Durbin, E.G. and , TASC (Funder) (2000) The effect of food on the determination of sex ratio in Calanus spp.: evidence from experimental studies and field data. ICES Journal of Marine Science, 57 (6). pp. 1752-1763. ISSN 1054-3139

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Abstract

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.