Reduced fertility and asymptotics of the logistic model

Daniel Maxin, Fabio Milner, Laurentiu Sega

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


This logistic model includes three age groups. Juveniles do not reproduce, and old individuals reproduce at a lower rate. Pairings between individuals of different fertility rates may lead to multiple equilibria and bi-stability: the total population converges to different limits depending on its initial size. The behavior is correlated with transition rates from high to low fertility groups and with the frequency of pairing among the various groups of reproduction level. The proportions of adults at equilibrium are roots of a quartic polynomial, alternating sinks and saddles. Necessary and sufficient conditions for the existence of bi-stability are provided for a simplified model.

Original languageEnglish (US)
Pages (from-to)37-49
Number of pages13
JournalMathematical population studies
Issue number1
StatePublished - Jan 2 2016


  • Asymptotic behavior
  • bi-stability
  • logistic behavior
  • population dynamics
  • reduced reproduction
  • two-sex models

ASJC Scopus subject areas

  • Demography
  • Geography, Planning and Development
  • General Agricultural and Biological Sciences


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