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

Citation
X. Irigoien et al., The effect of food on the determination of sex ratio in Calanus spp.: evidence from experimental studies and field data, ICES J MAR, 57(6), 2000, pp. 1752-1763
Citations number
49
Categorie Soggetti
Aquatic Sciences
Journal title
ICES JOURNAL OF MARINE SCIENCE
ISSN journal
10543139 → ACNP
Volume
57
Issue
6
Year of publication
2000
Pages
1752 - 1763
Database
ISI
SICI code
1054-3139(200012)57:6<1752:TEOFOT>2.0.ZU;2-5
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 exp eriments 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 fo od 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 li fespan often reported could be due to exhaustion of lipid stores.