Parameterisation of a population model for Acartia spp. in the southern Baltic Sea. Part 2. Egg production

The paper describes the modelling of egg production in Acartia spp. under changing environmental conditions in the southern Baltic Sea (Cdansk Deep). The hypothesis (Sekiguchi et al. 1980) that the food-saturated rate of egg matter production is equivalent to specific growth rate of copepods is applied. The average number of eggs produced per day by one Acartia female is obtained as a function of growth rate, i.e. by multiplying exp g(N3)-1 from the growth rate of the nauplius stage equation by The copepod model, reduced to a zero-dimensional population model calibrated for Acartia spp. under the environmental conditions typical of the southern Baltic Sea, was used to determine the effects of temperature and food concentration on the growth rate of each of the model stages (see Part 1 - Dzierzbicka-Glowacka et al. 2009 - this issue). In this part, egg production as a function of the above parameters is evaluated. The rate of reproduction (luring the seasons in the upper layer of the Gdansk Deep is also determined.