Carlotti, F. & H.J. Hirche. (1997). Growth and egg production of female Calanus finmarchicus: An individual-based physiological model and experimental validation. Marine Ecology Progress Series. 149(1-3):91-104.

80584

Carlotti, F. & H.J. Hirche

1997

149(1-3):91-104.

Publication

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A detalled individual-based model of egg production of Calanus finmarchic~lsis pro- posed. Female growth and egg product~onare represented by 8 state variables (gut content, nutrient processes. Clutch size is set constant under continuous food condi.tions, but the spawning interval pool, structural body, 011sac, and 4 stages of oocyte maturat~onw) hich are regulated by physiolog~cal changes with food ava~labilityand temperature depending on the rate of oocyte maturation. Sn~aller clutches can occur when eggs are released under bad external conditions. Thus changing conditions can produce different clutch size distributions. For model validation, egg production experiments were conducted under different constant and fluctuating food concentrations and compared with model simulations. In the experiments, egg production was strongly affected by food fluctuation. In experi- ments with alternating feeding and starvation cycles integrated egg production was affected by mean food concentration during the experiment rather than by the frequency of the cyrlcs. The model repro- duces correctly the egg production rates and final body carbon of females kept In the different food regimes. It prov~desa dynamical explanat~onof physiolog~calresponses of the ~ n d ~ v ~ dunadler short- eggs are laid. When food reappears, somatic growth resumes until structural body weight is restored. term food variation. When food becomes unavailable, the most advanced oocytes are released and egg production continues untll the nutrient pool decreases below a minimal critical value. Thereafter, no then oogenesis is fuelled. Experimental results were simulated correctly without using matter from the lipid pool.

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