A juvenile-adult model with periodic vital rates

J. M. Cushing

Research output: Contribution to journalArticlepeer-review

27 Scopus citations


A global branch of positive cycles is shown to exist for a general discrete time, juvenile-adult model with periodically varying coefficients. The branch bifurcates from the extinction state at a critical value of the mean, inherent fertility rate. In comparison to the autonomous system with the same mean fertility rate, the critical bifurcation value can either increase or decrease with the introduction of periodicities. Thus, periodic oscillations in vital parameter can be either advantageous or deleterious. A determining factor is the phase relationship among the oscillations in the inherent fertility and survival rates.

Original languageEnglish (US)
Pages (from-to)520-539
Number of pages20
JournalJournal of mathematical biology
Issue number4
StatePublished - Oct 2006

ASJC Scopus subject areas

  • Modeling and Simulation
  • Agricultural and Biological Sciences (miscellaneous)
  • Applied Mathematics


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