Physiologically Structured Models of Rotifer Population Dynamics in a Chemostat

Current knowledge of the principles of population dynamics is unsatisfactory on both empirical and theoretical grounds. The main problems are a weak empirical base, overly simple models with but vague links to real systems, and little effective interplay between theory and experiment. We therefore believe there is a need for renewed emphasis on carefully controlled laboratory studies of population dynamics, and on the development of structured population models that can be related clearly, directly, and convincingly to real experimental systems. The rotifer chemostat is an excellent system for conducting laboratory population-dynamics studies. Relevant experimental techniques, concepts, and sample data are outlined by Boraas et al. (1998). Here we summarize the basic ideas underlying classical models of the chemostat, show that these models are inadequate for rotifers, and outline an alternative modeling approach that we believe has the potential to provide a more satisfactory theory. Additional discussion can be found in the paper by McNair et al. (1998), on which the present document is based.