Computers, Materials & Continua DOI:10.32604/cmc.2022.032087 | |

Article |

Computational Stochastic Investigations for the Socio-Ecological Dynamics with Reef Ecosystems

1Department of Mathematics, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand

2Department of Mathematical Sciences, United Arab Emirates University, P.O.Box 15551, Al Ain, UAE

3Department of Mathematics and Statistics, Hazara University, Mansehra, Pakistan

4Department of Biological Sciences, Rabigh College of Science and Arts, King Abdulaziz University, Jeddah, Saudi Arabia

5Graduate Program in Administration, Federal University of Santa Maria, Santa Maria 93458, Brazil

*Corresponding Author: Wajaree Weera. Email: wajawe@kku.ac.th

Received: 06 May 2022; Accepted: 07 June 2022

Abstract: The motive of this work is to present a computational design using the stochastic scaled conjugate gradient (SCG) neural networks (NNs) called as SCGNNs for the socio-ecological dynamics (SED) with reef ecosystems and conservation estimation. The mathematical descriptions of the SED model are provided that is dependent upon five categories, macroalgae M(v), breathing coral C(v), algal turf T(v), the density of parrotfish P(v) and the opinion of human opinion X(v). The stochastic SCGNNs process is applied to formulate the SED model based on the sample statistics, testing, accreditation and training. Three different variations of the SED have been provided to authenticate the stochastic SCGNNs performance through the statics for training, accreditation, and testing are 77%, 12% and 11%, respectively. The obtained numerical performances have been compared with the Runge-Kutta approach to solve the SED model. The reduction of mean square error (MSE) is used to investigate the numerical measures through the SCGNNs for solving the SED model. The precision of the SCGNNs is validated through the comparison of the results and the absolute error performances. The reliability of the SCGNNs is performed by using the correlation values, state transitions (STs), error histograms (EHs), MSE measures and regression analysis.

Keywords: Socio-ecological state; conservation estimation; neural networks; reef ecosystems; scaled conjugate gradient; numerical study

The study of coral reef ecology systems (CRESs) or complex aquatic networks along with the composed construction based on the Scleractinia corals have located on their reigns skeletons [1]. CRES is the assortment of individuals, which provides the services to the nearby populace. CRES comprises on the number of polyps that are established into a large domain to perform as an electromagnet for both tourism and fishing. A major feature of coral growth is zooxanthellae algae (ZA), which is also recognized as a unicellular creature and proficient in using the photosynthetic process. During the CRESs procedure, ZA is produced with the interdependent connotation of coral polyps in the process of isolation. For the nutrients, CRES is used as an organic indication, which establishes ZA in the form of a coral substance to generate the chemical combinations in the photosynthesis process [2]. This combined response series approves the growth and development of each category of the model.

The Caribbean form the CRESs demonstrates the elasticity in the contradiction of the past conflicts and recovered quickly after the Hurricane Allen (1980–1983) [3–6]. The mutual connotation between the urchins and CRESs is authenticated with the urchin entities using the algal turf nutrition. Parrotfish performs the main grazers procedure based on the ecosystem, which is used to emphasize the conditions of operative protection [7]. The Algal progresses are considered dangerous due to the authenticity of the CRESs. The macroalgae spread is documented to evade the development of reef along with the potential growth.

The mathematical form of the systems along with the diverse perceptions have been functional in numerous submissions of the religion, non-physical form of the models (psychology, sociology, political science, economics), linguistics, engineering studies (computer science, mechanical, electrical), philosophy, and in the dynamics of the natural science (earth sciences, biology, chemistry, physics). A mathematical model is applied to scrutinize the influences of numerous apparatuses. The mathematical systems have been provided in several measures, like game theory, statistics, and well as dynamic systems. In general, mathematical systems can indicate the logical strategies, while the scientific measures exhibit the brilliance of the models that indicate the theoretical performances to support the consequences of the repeatable actions. The mathematical form of the systems has been illustrated in the ecosystem management [8,9], vaccination [10,11], land-use variations [12] and forestry [13–16] and prediction differential model [17].

The human conducts and the dynamic impacts based on the CRESs require more investigations to model the theoretical form of the systems. Several anthropogenic influences have been used to reproduce the present work based on the reef protection along with the covered areas of marine [18]. The human presentations have been dynamically modeled, adaptively evolving the phenomenon, a deeper and richer shape of the anthropogenetic pressures in a system over a long time. The mathematical models based on the biological systems have also been used in [19–25].

The mathematical form of the socio-ecological dynamics (SED) using the reef ecosystems and the conservation estimation model is provided in five categories, Macroalgae M(v), breathing coral C(v), algal turf T(v), the density of parrotfish P(v) and the opinion of human opinion X(v) [26]:

The starting four dynamics in the Eq. (1) represent the same behavior as presented by Blackwood et al. [27], which is used to exclude the constant parrotfish concentration values. These values alter with the coupling

The motive of the present work is to provide a computational design using the stochastic scaled conjugate gradient (SCG) neural networks (NNs) called as SCGNNs for the SED with reef ecosystems and conservation estimation. The stochastic frameworks have been used to provide the results of several evolutionary/swarming schemes [28–34]. The advanced topographies have never been exploited before to solve the SED with reef ecosystems and conservation estimation using the SCGNNs. Few major novel points of this study are given as:

• A novel design of the SCGNNs is presented to solve the SED with reef ecosystems and conservation estimation using the SCGNNs.

• The comparison of the achieved performances via SCGNNs and the database Runge-Kutta solutions has been presented to solve the SED model.

• The overlapping of the outcomes designates the accuracy and correctness of the proposed stochastic SCGNNs procedure for solving the mathematical SED nonlinear model.

• The precise and accurate absolute error (AE) presentations designate the excellence of the stochastic designed SCGNNs approach to solving the SED mathematical model.

• The presentations via correlation values, STs, EHs, MSE measures and regression analysis provide the accurateness of the stochastic designed SCGNNs approach for the nonlinear SED systems.

The remaining sections of the paper are organized as: Section 2 is based on the stochastic methodology. Section 3 provides the numerical procedures of the SED model. Section 4 derives the concluding remarks of the present study.

2 Designed Method Through SCGNNs

The proposed methodology based on the SCGNNs is described in two phases for solving the SED with reef ecosystems and conservation estimation. The process of optimization based on the multi-layer procedures is provided in Fig. 1. The SCGNNs procedure is applied by using the stochastic SCGNNs performance through the statics for training, accreditation, and testing are 77%, 12% and 11%, respectively.

Fig. 1 shows the dataset is designed for different variants of SED mathematical system based on the Runge-Kutta scheme (invoking ‘NDSolve’ solver in the Mathematica software). The Runge-Kutta method is applied as a default parameter setting in ‘NDSolve’ to check the execution and terminating tolerances. The statics designed for SED mathematical system is applied in the process of comparison throughout the study.

The designed SCGNNs is implemented using the ‘nftool’ solver in ‘Matlab’ for the appropriate portions of hidden neurons, testing statistics, learning methods and verification statics. While the process of implementation based on the SCGNNs for solving the SED mathematical system based on the parameter setting is provide in Tab. 2. The networks training is directed with SCGNNs process, where the backpropagation is oppressed to improve the Jacobian ‘jZ’ based on the presentation, i.e., MSE, to adjust the weight along with the variables of bias Z. The modification or adaptation for each decision variable by taking the SCG process is presented below as:

Fig. 2 shows the formulation of the proposed LMBNNs procedure using the generic perception based on the single neurons.

This section presents the numerical representations using the proposed SCGNNs for three different variations based on the mathematical form of the SED with reef ecosystems and conservation estimation are mathematically given as:

Case-1: Suppose a SED model by taking

Case-2: Suppose a SED model by taking

Case-3: Suppose a SED model by taking

The obtained results from the SCGNNs have been calculated with interval [0, 1] to solve the SED model with reef ecosystems and conservation estimation by taking 13 numbers of neurons with the statical assessments of training, accreditation, and testing have been used as 77%, 12% and 11%, respectively. The input, output, and hidden layer’s structure of the SED model is shown in Fig. 3. The different measures for the selection of these data can also be chosen. If the training performances have been chosen as >77%, then one can get the better performances due to the values of bias input. Furthermore, if the statics for the training samples is selected <77%, then the correctness of the SCGNNs is degraded significantly for SED model with reef ecosystems and conservation estimation. Therefore, the sample statics for the unbiased and bias inputs should be selected with care and concentration to avoid both premature convergence and divergence.

The illustrations based on the SED mathematical system are presented in Figs. 4–12. The MSE measures and STs representations are illustrated in Figs. 4 and 5 to present the solutions of the SED system. The MSE measures for testing, best curve, training, and corroboration are shown in Fig. 4. The Epochs for the mathematical SED system have calculates using the SCGNNs scheme as 68, 58 and 38, which found as 7.6689 × 10−11, 5.8828 × 10−11 and 1.6161 × 10−13. The gradient presentations are derived in Fig. 5 for the SED model based on the SCGNNs. These representations are measured as 9.578 × 10−08, 9.570 × 10−08 and 9.729 × 10−08 for case 1 to 3. These illustrations designate the accuracy of the SCGNNs for the SED mathematical system. The fitting curves performances are shown in Figs. 6–8 for each variant of the SED mathematical system, which has been performed by using the comparison of references and achieved solutions. The error based maximum values have been plotted through the training, testing, and corroboration measures by using the SCGNNs procedure for the SED mathematical system. The EHs representations have been provided in Figs. 9a–9c, whereas the regression performances have been illustrated in Figs. 10–12 for the SED nonlinear system. The correlation measures are derived to authenticate the regression that is measured as 1 for each case of the SED. The training, corroboration, and testing measures show the correctness of the stochastic SCGNNs scheme for the SED. Furthermore, the MSE convergence has been provided in Tab. 3 for training, endorsement, epochs, complexity measures and backpropagation.

The results (reference and obtained) comparisons are presented in Fig. 13 and the AE for each case of the SED system is illustrated in Fig. 14. The results for the classes of the SED based Macroalgae M(v), breathing coral C(v), algal turf T(v), density of parrotfish P(v) and the opinion of human opinion X(v) are presented in Figs. 13a–13e. The overlapping of the solutions is performed for all cases and each dynamic of the SED model, which represent the perfection and correctness of the stochastic SCGNNs. The AE illustration have been provided in Figs. 14a–14e based on the Macroalgae M(v), breathing coral C(v), algal turf T(v), density of parrotfish P(v) and the opinion of human opinion X(v) of the SED mathematical system. It is observed in the Fig. 14a, that plots of AE for the class M(v) lie as 10−05 to 10−06, 10−04 to 10−06 and 10−06 to 10−07 for 1st to 3rd case. The AE for the class C(v) are derived in Fig. 14b that are calculated around 10−05 to 10−07, 10−05 to 10−08 and 10−07 to 10−09. The AE for the class T(v) are presented in Fig. 14c, which are found as 10−05 to 10−07, 10−05 to 10−06 and 10−06 to 10−07. The AE for the class P(v) are given in Fig. 14d that found around 10−07 to 10−08, 10−06 to 10−07 and 10−07 to 10−09. Moreover, the AE measures for the category X(v) are derived in Fig. 14e, which are calculated as 10−05 to 10−08, 10−05 to 10−06 and 10−06 to 10−08 for 1st to 3rd case of the SED mathematical model. These overlapping of the calculated and reference results as well as the AE values perform the accuracy of the proposed SCGNNs for solving the SED nonlinear mathematical system.

The motive of current investigations is to provide a computational structure using the stochastic procedure based on the scaled conjugate gradient neural networks for the socio-ecological dynamics with reef ecosystems and conservation estimation. The mathematical formulations of the SED using the reef ecosystems and conservation estimation have been presented with five categories, Macroalgae M(v), breathing coral C(v), algal turf T(v), density of parrotfish P(v) and the opinion of human opinion X(v). The stochastic procedure based on the SCGNNs has been implemented to formulate the socio-ecological dynamics using the sample statistics, testing, accreditation, and training. Three different classes of the socio-ecological dynamics have been used to validate the stochastic SCGNNs measures through the training, accreditation, and testing statics that has been chosen as 77%, 12% and 11%, respectively along with thirteen numbers of neurons. The comparison of the obtained results has been presented with the reference solutions (Runge-Kutta) for the socio-ecological dynamics system. The AE has been performed in good measures for solving each class of the socio-ecological dynamics with reef ecosystems and conservation estimation, which indicates the correctness of the stochastic approach. The reduction of mean square error has been provided to investigate the numerical measures through the SCGNNs for solving the SED system. The trustworthiness results based on the SCGNNs have been validated through the values of the correlation, state transitions, error histograms, MSE measures and regression analysis.

The designed SCGNNs scheme can be applied in the future to solve the various fluid systems, lonngren-wave networks [35–37], fractional models [38–42], delayed neural networks [43–46] and nonlinear models [47–50].

Funding Statement: This project is funded by National Research Council of Thailand (NRCT) and Khon Kaen University: N42A650291.

Conflicts of Interest: The authors declare that there have not conflicts of interest.

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