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Reduced fertility and asymptotics of the logistic model

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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.
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Keywords: Asymptotic behavior; bi-stability; logistic behavior; population dynamics; reduced reproduction; two-sex models

Document Type: Research Article

Affiliations: 1: Department of Mathematics and Statistics, Valparaiso University, Indiana, USA 2: School of Mathematical and Statistical Sciences, Arizona State University, Tempe, Arizona, USA 3: Department of Mathematics, Augusta University, Augusta, Georgia, USA

Publication date: January 2, 2016

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