Journal of Mathematical Biology

, Volume 69, Issue 4, pp 1027–1056 | Cite as

State-dependent neutral delay equations from population dynamics

Article

Abstract

A novel class of state-dependent delay equations is derived from the balance laws of age-structured population dynamics, assuming that birth rates and death rates, as functions of age, are piece-wise constant and that the length of the juvenile phase depends on the total adult population size. The resulting class of equations includes also neutral delay equations. All these equations are very different from the standard delay equations with state-dependent delay since the balance laws require non-linear correction factors. These equations can be written as systems for two variables consisting of an ordinary differential equation (ODE) and a generalized shift, a form suitable for numerical calculations. It is shown that the neutral equation (and the corresponding ODE—shift system) is a limiting case of a system of two standard delay equations.

Keywords

Neutral delay equation State-dependent delay Blowfly equation  Age structure Quasi-linear Population dynamics 

Mathematics Subject Classification

34K40 34K17 92D25 34K20 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  1. 1.Bolyai InstituteUniversity of SzegedSzegedHungary
  2. 2.Department of MathematicsUniversity of TübingenTübingenGermany
  3. 3.Institute of Mathematics, Chair for Mathematical ModellingTechnische Universität MünchenGarching b. MünchenGermany

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