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Bifurcation and chaos control in a discretetime predator–prey model with nonlinear saturated incidence rate and parasite interaction
Advances in Difference Equations volume 2019, Article number: 28 (2019)
Abstract
The dynamical behavior of the predator–prey system is influenced effectively due to the mutual interaction of parasites. Regulations are imposed on biodiversity due to such type of interaction. With implementation of nonlinear saturated incidence rate and piecewise constant argument method of differential equations, a threedimensional discretetime model of prey–predator–parasite type is studied. The existence of equilibria and the local asymptotic stability of these steady states are investigated. Moreover, explicit criteria for a Neimark–Sacker bifurcation and a perioddoubling bifurcation are implemented at positive equilibrium point of the discretetime model. Chaos control is discussed through implementation of a hybrid control technique based on both parameter perturbation and a state feedback strategy. At the end, some numerical simulations are provided to illustrate our theoretical discussion.
Introduction
Trophic interactions, keystone species, food webs, competition and biodiversity are greatly affected due to interaction of parasites and consequently the community structure can be reverted. Furthermore, qualitative analysis of prey and predator interaction is a distinguished field for investigation in mathematical ecology. On the other hand, presence of some kind of disease in prey–predator interaction is a prominent topic for investigation, and this is a comparatively new subject in the field of ecoepidemiology. In order to observe the spread of some sort of disease, both aspects for ecology and epidemiology are included in such a field of study. It is important to point out some earlier studies in the area related to mathematical ecology and epidemiology. For this purpose, Hadeler and Freedman [1] studied a prey–predator system in which both types of species (prey and predator) were subjected to parasitism. Freedman [2] investigated a prey–predator model in which the predator population is always treated as primary host whereas the prey population density may be either a secondary host or a primary host for the parasite interaction. Beltrami and Carroll [3] studied a simple mathematical system of trophic type in which a mortality of virus–induced type is included, and the actual bloom patterns for several species are also presented. Venturino [4] investigated prey–predator systems subjected to some sort of disease in prey density. Moreover, Chattopadhyay and Arino [5] examined a three species ecoepidemiological model, that is, the predator population, the infected prey, and the sound prey. Keeping in view the interaction of three species for an ecoepidemiological model consisting of predator density, infected prey and sound prey, a mathematical model was investigated by Chattopadhyay et al. [6]. Furthermore, a Hopf bifurcation was also studied at its positive steady state.
Next, keeping in view an ecoepidemiological model of pelicans at risk in the Salton Sea studied by Chattopadhyay et al. [7], we consider the following predator–prey–parasite model:
where \(x ( t )\), \(y ( t )\), and \(z ( t )\) denote densities of susceptible Tilapia fish population, infected Tilapia fish population and predator population known as Pelican birds, respectively. Moreover, x and y are the state variables to represent the susceptible prey population density and infected prey population density, respectively, at time t, and z represents predator population density at time t. Furthermore, it is supposed that the population for prey obeys the logistic growth function where s is taken as the growth rate and k represents the carrying capacity. Moreover, α denotes the coefficient for disease transmission, μ represents the death rate of the infected Tilapia fish population, δ is a constant for halfsaturation rate, β is the capturing capacity of predators, γ is used for the conversion efficiency of predator, and η represents the fooddependent death rate related to the predator population. For more investigations and modifications related to system (1.1) we refer to [8,9,10,11,12]. All these modifications and discussions are implemented to continuous counterparts of system (1.1). Hence it is worthwhile to discuss discrete counterparts of system (1.1) in which populations are treated as generations of nonoverlapping type. Furthermore, there are a lot of mathematical investigations related to flip bifurcation, Hopf bifurcation and controlling chaos in planar discretetime models and a little work is performed for controlling chaos and bifurcation analysis for discretetime systems of three or more dimensions. Hence, it is worthwhile to discuss the bifurcation analysis and controlling chaos in the case of a threedimensional discretetime systems.
By replacing the bilinear incidence rate in the saturated incidence rate of nonlinear type the following modification is proposed for the system (1.1):
where c denotes the contact rate constant for the crowding effect. Moreover, system (1.2) shows that other fish cannot be caught by Pelicans birds, besides Tilapia. This fact is compatible with natural phenomena because in the literature there are several experimental studies in favor of this argument. Moreover, since system (1.2) is a modification of an ecoepidemiological model of Pelicans at risk in the Salton Sea by Chattopadhyay et al. [7], and it is pointed out in [13] that very few fish species can endure living in the Salton Sea due to the high salinity. Due to the presence of highly salty and polluted water, only Tilapia fish have survival tendency in Salton Sea. Consequently, other species of freshwater fish cannot survive in salty water.
According to survey reports published by US Geological Survey National Wildlife Health Center from 1978 to 2003 many white pelicans were to die out due to type C botulism [14]. In 1996, over 8500 white pelicans had died at Salton Sea in California due to infection of type C botulism. The major cause of that disaster were Tilapia fish which are a key source for C botulism toxins produced in white pelican birds. In addition, the study has indicated that bacterial infections take part in lowering oxygen levels in the tissues of affected fish. Due to lack of oxygen, the fish find oxygen from the ocean surface and this leads to an appropriate environment to produce botulism in the tissues of the infected fish. When pelicans attack on these defenseless fish, the botulism toxins is ingested by pelican birds and as a result avian botulism is produced in their bodies [15].
Moreover, in system (1.2), it is assumed that pelican birds only prey infected Tilapia, but do not capture the healthy Tilapia because the infected fish are feeble and become easier to prey. On the other hand, there is a significant number of infected Tilapia fish present in the Salton Sea and due to their struggle against death these are more unprotected and attractive to the Pelican birds [7]. Meanwhile, healthy Tilapia easily escape and predation becomes difficult.
For qualitative analysis, including local stability, bifurcations analysis and chaos control for a discrete counterpart of system (1.2), a piecewise constant argument is implemented to obtain the following exponential form of nonlinear difference equations:
Moreover, the remaining discussion for this paper is organized as follows. In Sect. 2, we explore the existence of equilibria and conditions for their local asymptotic stability. In Sect. 3, an explicit criterion for Hopf bifurcation is implemented at positive steady state of system (1.3). Section 4 is dedicated to an implementation of an explicit criterion for flip bifurcation at a positive equilibrium of system (1.3). In Sect. 5, a chaos control strategy based on parameter perturbation and a state feedback control methodology is implemented to system (1.3). Finally, some suitable numerical simulations are presented in Sect. 6 for verification of our theoretical discussion.
Existence of equilibria and stability
We investigate steady states and criteria for local asymptotic stability of these equilibria. For this purpose, we suppose that \(\mu < k \alpha \), then we obtain the following trivial and boundary steady states for model (1.3):
where
and
Furthermore, there exists a unique positive steady state for system (1.3) if the following conditions are satisfied:
Assume that (2.1) holds true, then positive steady state for model (1.3) is written as \(E_{*} =( x^{*}, y^{*}, z^{*} )\), where
and
Keeping in view the local asymptotic stability for threedimensional systems of discrete type, the following lemma is presented.
Lemma 2.1
([16])
We consider a cubic polynomial equation of the following type:
where \(\alpha _{2}\), \(\alpha _{1}\) and \(\alpha _{0}\) represent real constants. Furthermore, all roots for the polynomial Eq. (2.2) lie within the open unit disk if and only if the following conditions are satisfied:
Furthermore, the Jacobian matrix \(J_{(1.3)} ( E_{0} )\) for system (1.3) evaluated at the trivial equilibrium \(E_{0}\) is given by
Then it follows from \(J_{(1.3)} ( E_{0} )\) that \(E_{0}\) is an unstable steady state for system (1.3). Moreover, the variational matrices computed about \(E_{1}\) and \(E_{2}\) are given by
and
Furthermore, the characteristic polynomial equation for \(J_{(1.3)} ( E _{2} )\) is calculated as follows:
where
Furthermore, the local asymptotic behavior for steady states \(E_{1}\) and \(E_{2}\) of the system (1.3) is given in the following lemma.
Lemma 2.2

(i)
Equilibrium point \(E_{1}\) for model (1.3) is a sink and locally asymptotically stable if and only if the following conditions are satisfied:
$$ s < 2,\qquad k \alpha < \mu . $$ 
(ii)
Suppose that \(\mu < k \alpha \), then the equilibrium point \(E_{2}\) for model (1.3) is a sink and locally asymptotically stable if and only if the following conditions are satisfied:
$$ \vert \beta _{2} + \beta _{0} \vert < 1+ \beta _{1},\qquad \vert \beta _{2} 3 \beta _{0} \vert < 3 \beta _{1},\quad \textit{and}\quad \beta _{0}^{2} + \beta _{1}  \beta _{0} \beta _{2} < 1, $$where \(\beta _{2}\), \(\beta _{1}\) and \(\beta _{0}\) are written in (2.4).
Furthermore, the Jacobian matrix denoted by \(J_{(1.3)} ( E_{*} )\) for system (1.3) evaluated about the equilibrium point \(E_{*}\) is calculated as follows:
where
Next, the characteristic polynomial equation for \(J_{(1.3)} ( E_{*} )\) is given by
where
One can implement Lemma 2.1 to investigate the stability conditions for \(E^{*}\) as follows.
Lemma 2.3
Suppose that the conditions given in (2.1) are satisfied, then the steady state \(E_{*}\) for model (1.3) is a sink and it is locally asymptotically stable if and only if the following inequalities are satisfied:
where \(\gamma _{2}\), \(\gamma _{1}\) and \(\gamma _{0}\) are written in (2.7).
Hopf bifurcation analysis
Here we investigate the parametric conditions for which the positive steady state for discretetime system (1.3) undergoes a Neimark–Sacker (Hopf) bifurcation. For such an investigation an explicit criterion of Hopf bifurcation is used without computing the eigenvalues for the variational matrix of system under consideration (see also [17, 18]). For this purpose, an explicit criterion for Hopf bifurcation is given below.
Lemma 3.1
([19])
An ndimensional system of discrete type is considered as follows:
where \(\xi \in \mathbb{R}\) is used for bifurcation parameter. Furthermore, considering characteristic polynomial of the Jacobian matrix \(J ( Z^{*} )=( \theta _{ij} )_{n \times n}\) evaluated at fixed point \(Z^{*} \in \mathbb{R}^{n}\) for \(F_{\xi }\) as follows:
where \(\tau _{i} = \tau _{i} ( \xi , u )\), \(i =1,2,\ldots , n\), and u is referred to as the controlling parameter, or it may be some other parameter which is to be determined. Next, we take into account a sequence of the form \(( \mathbb{D}_{i}^{\pm } ( \xi , u ) )_{i =0}^{n}\) of determinants such that \(\mathbb{D}_{0}^{\pm } ( \xi , u )=1\), and it is defined as follows:
where
Furthermore, the following conditions are satisfied:
 (C1):

We assume that \(\mathbb{D}_{n 1}^{} ( \xi _{0}, u )=0\), \(\mathbb{D}_{n 1}^{+} ( \xi _{0}, u )>0\), \(P_{\xi _{0}} (1)>0\), \((1 )^{n} P_{\xi _{0}} (1)>0\), \(\mathbb{D}_{i}^{ \pm } ( \xi _{0}, u )>0\), for \(i = n 3, n 5, \ldots , 2\) (or 1), when n is odd (or even), this is known as the eigenvalue criterion.
 (C2):

Next, we suppose that \(( \frac{d}{d \xi } ( \mathbb{D}_{n 1}^{} ( \xi , u ) ) )_{\xi = \xi _{0}} \neq 0\), and this is known as the transversality criterion for the Hopf bifurcation.
 (C3):

Finally, we consider that \(\cos ( \frac{2 \pi }{l} ) \neq \varphi \), or the resonance condition \(\cos ( \frac{2 \pi }{l} ) = \varphi \), where \(l =3,4,5,\ldots \) , and \(\varphi =10.5 P_{\xi _{0}} (1) \mathbb{D}_{n 3}^{} ( \xi _{0}, u )/ \mathbb{D}_{n 2}^{+} ( \xi _{0}, u )\), which is called the nonresonance, or resonance criterion, then Hopf bifurcation takes place for the critical value \(\xi _{0}\).
If we take \(n =3\), then the following lemma provides us with the parametric conditions for which model (1.3) undergoes a Hopf bifurcation whenever s is chosen as bifurcation parameter.
Lemma 3.2
The equilibrium point \(E_{*}\) for model (1.3) undergoes a Hopf bifurcation at critical parametric value \(s= s_{0}\) if the following conditions are satisfied:
and
where \(\gamma _{2}\), \(\gamma _{1}\), and \(\gamma _{0}\) are listed in (2.7), and \(s_{0}\) denotes a possible real root for \(1 \gamma _{1} ( s )+ \gamma _{0} ( s )( \gamma _{2} ( s ) \gamma _{0} ( s ))=0\).
Proof
By choosing \(n =3\) and selecting s as bifurcation parameter, it follows from Lemma 3.1 and Eq. (2.6) that
and
□
Flip bifurcation analysis
Now we investigate the parametric conditions for which a unique positive steady state for discretetime system (1.3) encounters a perioddoubling (flip) bifurcation. For such an investigation, we use an explicit criterion of the perioddoubling (flip) bifurcation without computing the eigenvalues for the Jacobian matrix of a given model. For this purpose, we need the following result.
Lemma 4.1
([20])
An ndimensional system of discrete type is considered as follows: \(Z_{k+1} = F_{\xi } ( Z_{k} )\) with similar conditions (3.1), (3.2) and (3.3) to those stated in Lemma 3.1. Next, it is assumed that the following criteria are satisfied:
 (H1):

\(P_{\xi _{0}} (1)=0\), \(\mathbb{D}_{n1}^{\pm } ( \xi _{0},u)>0\), \(P_{\xi _{0}} (1)>0\), \(\mathbb{D}_{i}^{\pm } ( \xi _{0},u)>0\), \(i=n2,n4,\ldots , 1\) (or 2), when n is even (or odd, respectively), and this is known as the eigenvalue criterion for flip bifurcation.
 (H2):

\(\frac{\sum_{i=1}^{n} (1 )^{ni} \tau '_{i}}{ \sum_{i=1}^{n} (1 )^{ni} (ni+1) \tau _{i1}} \neq 0\), where \(\tau '_{i}\) denotes derivative of \(\tau ( \xi )\) at \(\xi = \xi _{0}\), and this is called the transversality criterion, then a flip bifurcation occurs for the critical value \(\xi _{0}\).
Furthermore, if we take \(n =3\) in Lemma 4.1, then we obtain the following result for model (1.3) providing conditions for a flip bifurcation when s is chosen as the bifurcation parameter.
Lemma 4.2
The equilibrium \(E_{*}\) for model (1.3) undergoes a flip bifurcation at critical value \(s= s_{0}\) if the following conditions are satisfied:
and
where \(\gamma _{2}\), \(\gamma _{1}\), and \(\gamma _{0}\) are written in (2.7), \(\gamma '_{i}\) is derivative of \(\gamma ( s )\) at the critical value \(s = s_{0}\), and \(s_{0}\) represents a possible real root for \(1 \gamma _{2} ( s )+ \gamma _{1} ( s ) \gamma _{0} ({s})=0\).
Chaos control
Next, we investigate a chaos control technique for the discretetime model (1.3). Keeping in view the simplicity, a hybrid control methodology is chosen which was firstly proposed by Luo et al. [21]. The hybrid chaos control method consists of a single control parameter which lies inside the open unit interval. Furthermore, the implementation for such a hybrid control strategy is comparatively simple one and it is based on both parameter perturbation and state feedback control strategy. It is worthwhile to mention some other investigations for controlling chaos in discretetime systems and the interested reader is referred to [22,23,24,25,26,27,28,29,30,31].
One can apply a hybrid control method to obtain a corresponding control model of the following type:
where \(0< B <1\) is used for the controlling parameter. Moreover, the variational matrix for model (5.1) evaluated at its positive steady state \(( x^{*}, y^{*}, z^{*} )\) is calculated as follows:
where \(a_{12}\), \(a_{22}\) and \(a_{32}\) are listed in (2.5). Then the characteristic polynomial equation for the aforementioned variational matrix of controlled model (5.1) is calculated as follows:
where
Then it is obvious that the equilibrium point for model (5.1) is a sink as long as the regulator poles are of modulus less than 1. Such parametric conditions are stated in the following lemma.
Lemma 5.1
The equilibrium \(E_{*}\) for model (5.1) is a sink and locally asymptotically stable if and only if the following inequalities are satisfied:
Numerical simulation and discussion
Example 6.1
First of all, we select the parametric values as follows: \(\alpha =0.5\), \(k=6.2\), \(\beta =0.9\), \(\delta =0.85\), \(\mu =0.5\), \(\gamma =1.5\), \(\eta =0.1\), \(c=8.5\) and \(s\in [1.8,2.8]\). Moreover, the initial values are taken as \(( x_{0}, y_{0}, z_{0} )=(6.06,0.068,1.45)\), then it is observed that system (1.3) undergoes perioddoubling (flip) bifurcation as we choose \(s=2.09247\). Furthermore, it is easy to see that, for the selected parametric values \(\alpha =0.5\), \(k=6.2\), \(\beta =0.9\), \(\delta =0.85\), \(\mu =0.5\), \(\gamma =1.5\), \(\eta =0.1\), \(c=8.5\) and \(s=2.09247\), one can easily calculate the characteristic polynomial equation for model (1.3):
Furthermore, the roots for Eq. (6.1) are calculated as \(\lambda _{1,2} =0.67657\pm 0.174034 i\), and \(\lambda _{3} =1\), so that we have \(\mid \lambda _{1,2} \mid =0.698595\). Consequently, the eigenvalues condition flip bifurcation is justified. Obviously, all conditions in Lemma 4.2 are listed and justified:
and
Furthermore, diagrams related to bifurcation and maximum Lyapunov exponents (MLEs) are presented in Fig. 1.
We select parameters \(\alpha =0.5\), \(k =6.2\), \(\beta =0.9\), \(\delta =0.85\), \(\mu =0.5\), \(\gamma =1.5\), \(\eta =0.1\), \(c =8.5\) and \(s =2.8\) to demonstrate the effectiveness of chaos control strategy given in system (5.1). For these selected parametric values model (1.3) has a positive steady state given by \(( x^{*}, y^{*}, z^{*} )=(6.08429,0.068,1.45641)\). On the other hand, the variational matrix of model (5.1) at the steady state \(( x^{*}, y^{*}, z^{*} )=(6.08429,0.068,1.45641)\) is computed as follows:
An application of the Jury condition shows that the steady state for controlled model (5.1) is a sink if and only if \(0< B <0.738529\), and consequently the length for the stability interval is given by 0.738529. This shows that the length of the stability interval is comparatively suitable although the value \(s =2.8\) is selected from the extreme right end of the chaotic interval.
Example 6.2
Next, we choose the parametric and initial values as follows: \(\alpha =1.6\), \(k=1.4\), \(\beta =0.13\), \(\delta =0.4\), \(\mu =0.15\), \(\gamma =2.95\), \(\eta =0.1\), \(c=0.5\), \(( x_{0}, y_{0}, z_{0} )=(1.10514,0.141,6.2505)\) and bifurcation parameter \(s\in [1.8,2.8]\). In this case, it is observed that for these selected values system (1.3) undergoes a Hopf bifurcation at \(s=1.93866\), and bifurcation diagrames are depicted in Fig. 2. Furthermore, if we take values as \(\alpha =1.6\), \(k=1.4\), \(\beta =0.13\), \(\delta =0.4\), \(\mu =0.15\), \(\gamma =2.95\), \(\eta =0.1\), \(c=0.5\) and \(s=1.93866\), then the characteristic polynomial equation for model (1.3) is calculated, thus:
Keeping in view the above selected values the roots for the aforementioned characteristic equation are given by \(\lambda _{1} =0.0934286\), and \(\lambda _{2,3} =0.922095\pm 0.386964 i\) so that the modulus for complex conjugate roots is \(\mid \lambda _{2,3} \mid =1\). Consequently, the eigenvalues condition for Hopf bifurcation is justified. On the other hand, all other conditions in Lemma 3.2 are verified:
and
By considering the equation \(\cos ( \frac{2 \pi }{l} ) =0.922095\), we obtain \(l =\pm 15.8133\). Therefore, the condition for nonresonance is also correctly justified. Furthermore, some phase portraits for various values of s are depicted in Fig. 3. Moreover, in Fig. 3(b) the appearance of closed invariant circle at \(s =1.93866\) is clearly observed.
Furthermore, we choose values as \(\alpha =1.6\), \(k =1.4\), \(\beta =0.13\), \(\delta =0.4\), \(\mu =0.15\), \(\gamma =2.95\), \(\eta =0.1\), \(c =0.5\) and \(s =2.8\) in order to show the effectiveness for hybrid control method implemented in model (5.1). With these selected values, one can easily obtain the following variational matrix for model (5.1) computed at its positive steady state \((1.15347,0.141093,6.55112)\):
An application of the Jury condition shows that the steady state for controlled model (5.1) is a sink if and only if \(0< B <0.446796\). Consequently, in this case of a Hopf bifurcation, the length for the stability interval is less than as that of flip bifurcation.
Example 6.3
Finally, in order to select the parametric values in a range observed in an actual predator–prey system, we choose most of our basic parametric values from the study of ecoepidemiological models of pelicans at risk in the Salton Sea by Chattopadhyay et al. [7, 9]. These parametric values are given in Table 1. Keeping in view the tabulated values in Table 1, we choose \(c=1.2\) as the crowding effect in the contact rate and \(s\in [1.5,3]\) as the bifurcation parameter. Then the positive equilibrium of system (1.3) undergoes a perioddoubling bifurcation at \(s=2.00701\). The bifurcation diagrams and MLE are depicted in Fig. 4.
Concluding remarks
In this paper, the qualitative nature of discretetime system (1.3) is investigated. The discretetime system is obtained with implementation of a piecewise constant argument and bifurcating and chaotic behavior is studied with the help of standard mathematical techniques. The local behavior for equilibria is investigated by implementing the method of linearization. Furthermore, explicit criteria for Neimark–Sacker bifurcation and perioddoubling bifurcation are used for the investigation of the bifurcating behavior about positive equilibrium point. On the other hand, parametric values are also selected in a range observed in an actual predator–prey system, and in this case there is a brighter chance of occurrence of perioddoubling bifurcation in the discretetime model. A hybrid control strategy based on parameter perturbation and state feedback method is used for controlling the fluctuating and chaotic behavior of model (1.3). Moreover, it is noticed that the hybrid chaos control method can stabilize the chaotic orbits more effectively due to the emergence of a perioddoubling (flip) bifurcation as compared to that of a Neimark–Sacker (Hopf) bifurcation. Furthermore, it is investigated that the parameter c, representing the crowding effect in the system, is more appropriate for the emergence of perioddoubling (flip) and Neimark–Sacker (Hopf) bifurcations whenever it is varied in some suitable interval. It is examined that larger values of c may result flip bifurcation, meanwhile smaller values for c may result from a Neimark–Sacker bifurcation.
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Keywords
 Eco–epidemiological model
 Local stability
 Hopf bifurcation
 Flip bifurcation
 Chaos control