Aedes aegypti (Ae. aegypti: mosquito) is a known vector of several viruses including yellow fever, dengue, chikungunya and zika. In the current paper, we present a delayed mathematical model describing the dynamics of Ae. aegypti. Our model is governed by a system of three delay differential equations modeling the interactions between three compartments of the Ae. aegypti life cycle (females, eggs and pupae). By using time delay as a parameter of bifurcation, we prove stability/switch stability of the possible equilibrium points and the existence of bifurcating branch of small amplitude periodic solutions when time delay crosses some critical value. We establish an algorithm determining the direction of bifurcation and stability of bifurcating periodic solutions. In the end, some numerical simulations are carried out to support theoretical results..
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Figure 14. Existence of pair purely imaginary roots (left). The branches of bifurcation (diagram of bifurcation), branch $ 2 $ (blue line) is the branch of the periodic orbits that arise from the Hopf point, branch $ 3 $ (red line) is the branch of period doubling bifurcation point in branch $ 2 $ and branch $ 4 $ (green line) is the branch of period doubling bifurcation point in branch $ 3 $ (right). Note that, the branch $ 1 $ is the steady state $ E_1 $ with amplitude $ 0 $
Table 1. Parameters estimation
Table 2.
The sensitivity indices of the population reproduction number
Parameter | Sensitivity index | Index at parameters value |
$ \gamma $ | $ \frac{\mu_{E}}{\gamma+\mu_{E}} $ | $ +0.1428 $ |
$ \alpha $ | $ \frac{\mu_{P}}{\alpha+\mu_{P}} $ | $ +0.366 $ |
$ \sigma $ | $ +1 $ | $ +1 $ |
$ \beta $ | $ +1 $ | $ +1 $ |
$ \mu_F $ | $ -1 $ | $ -1 $ |
$ \mu_E $ | $ -\frac{\mu_{E}}{\gamma+\mu_{E}} $ | $ -0.1428 $ |
$ \mu_P $ | $ -\frac{\mu_{P}}{\gamma+\mu_{P}} $ | $ -0.336 $ |
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Schematic representation describing the interaction between females (
Surfaces representing the effect of parameters (left
Surfaces representing the effect of parameters(left
Surfaces representing the effect of parameters (left
Surfaces representing the effect of parameters (left
Surface representing the effect of parameters
Stability of
Instability of
Instability of
Mikhailov hodograph indicating the stability of
Periodic solution bifurcated from the steady state
Periodic solution bifurcated from the steady state
Chaotic solution bifurcated from the steady state
Existence of pair purely imaginary roots (left). The branches of bifurcation (diagram of bifurcation), branch