Abstract
Understanding effects of hypotheses about reproductive influences, reproductive schedules and the model mechanisms that lead to a loss of stability in a structured model population might provide information about the dynamics of natural population. To demonstrate characteristics of a discrete time, nonlinear, age structured population model, the transition from stability to instability is investigated. Questions about the stability, oscillations and delay processes within the model framework are posed. The relevant processes include delay of reproduction and truncation of lifetime, reproductive classes, and density dependent effects. We find that the effects of delaying reproduction is not stabilizing, but that the reproductive delay is a mechanism that acts to simplify the system dynamics. Density dependence in the reproduction schedule tends to lead to oscillations of large “period” and towards more unstable dynamics. The methods allow us to establish a conjecture of Levin and Goodyear about the form of the stability in discrete Leslie matrix models.
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This research was supported in part by the US Environmental Protection Agency under cooperation agreement CR-816081
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Silva, J.A.L., Hallam, T.G. Effects of delay, truncations and density dependence in reproduction schedules on stability of nonlinear Leslie matrix models. J. Math. Biol. 31, 367–395 (1993). https://doi.org/10.1007/BF00163922
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DOI: https://doi.org/10.1007/BF00163922