ABSTRACT
Suppose we want to model a population of ectothermic animals, e.g. the water flea Daphnia magna. Experimentally it appears that reproduction depends on the size of the individual animals and this observation motivated Kooijman & Metz (1984) to introduce a size structured model. As the biological assumptions underlying the model are described already in some detail, in Metz & Diekmann (1986; 1.3), Metz et al (1988), De Roos et al (preprint) and De Roos & Metz (preprint), we restrict ourselves here to its mathematical formulation:
