title: Limit cycles in a chemostat model for a single species with age structure.
abstract: We model an age-structured population feeding on an abiotic resource by combining the Gurtin-MacCamy [Math. Biosci. 43 (1979) 199] approach with a standard chemostat model. Limit cycles arise by Hopf bifurcations at low values of the chemostat dilution rate, even for simple maternity functions for which the original Gurtin-MacCamy model has no oscillatory solutions. We find the exact location in parameter space of the Hopf bifurcations for special cases of our model. The onset of cycling is largely independent of both the form of the resource uptake function and the shape of the maternity function.
authors.affiliation: Department of Applied Mathematics, University of Washington, Box 352420, Seattle, WA 98195-2420, USA. dtoth@amath.washington.edu
authors.forename: Damon
authors.initials: D
authors.lastname: Toth
authors.forename: Mark
authors.initials: M
authors.lastname: Kot
mesh_terms: D019149:Bioreactors; D016014:Linear Models; D008433:Mathematics; D008829:Microbiology; D008954:Models, Biological; D017711:Nonlinear Dynamics