In this paper, the main purpose is to reveal what kind of qualitative dynamical changes a continuous age-structured model may undergo as continuous reproduction is replaced with an annual birth pulse. Using the discrete dynamical system determined by the stroboscopic map we obtain an exact periodic solution of system with density-dependent fertility and obtain the threshold conditions for its stability. We also present formal proofs of the supercritical flip bifurcation at the bifurcation as well as extensive analysis of dynamics in unstable parameter regions. Above this threshold, there is a characteristic sequence of bifurcations, leading to chaotic dynamics, which implies that the dynamical behavior of the single species model with birth pulses are very complex, including small-amplitude annual oscillations, large-amplitude multi-annual cycles, and chaos. This suggests that birth pulse, in effect, provides a natural period or cyclicity that allows for a period-doubling route to chaos. Finally, we discuss the effects of generation delay on stability of positive equilibrium (or positive periodic solution), and show that generation delay is found to act both as a destabilizing and a stabilizing effect.
Mots-clés : hybrid matrix model, birth pulse, supercritical flip bifurcation, stroboscopic map, generation delay
@article{M2AN_2003__37_3_433_0,
author = {Tang, Sanyi},
title = {Hybrid matrix models and their population dynamic consequences},
journal = {ESAIM: Mod\'elisation math\'ematique et analyse num\'erique},
pages = {433--450},
publisher = {EDP-Sciences},
volume = {37},
number = {3},
year = {2003},
doi = {10.1051/m2an:2003036},
mrnumber = {1994311},
zbl = {1027.37052},
language = {en},
url = {http://www.numdam.org/articles/10.1051/m2an:2003036/}
}
TY - JOUR AU - Tang, Sanyi TI - Hybrid matrix models and their population dynamic consequences JO - ESAIM: Modélisation mathématique et analyse numérique PY - 2003 SP - 433 EP - 450 VL - 37 IS - 3 PB - EDP-Sciences UR - http://www.numdam.org/articles/10.1051/m2an:2003036/ DO - 10.1051/m2an:2003036 LA - en ID - M2AN_2003__37_3_433_0 ER -
%0 Journal Article %A Tang, Sanyi %T Hybrid matrix models and their population dynamic consequences %J ESAIM: Modélisation mathématique et analyse numérique %D 2003 %P 433-450 %V 37 %N 3 %I EDP-Sciences %U http://www.numdam.org/articles/10.1051/m2an:2003036/ %R 10.1051/m2an:2003036 %G en %F M2AN_2003__37_3_433_0
Tang, Sanyi. Hybrid matrix models and their population dynamic consequences. ESAIM: Modélisation mathématique et analyse numérique, Tome 37 (2003) no. 3, pp. 433-450. doi : 10.1051/m2an:2003036. http://www.numdam.org/articles/10.1051/m2an:2003036/
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