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Nonlinear Dynamics Simulations of Microbial Ecological Processes: Model, Diagnostic Parameters of Deterministic Chaos, and Sensitivity Analysis

  • Boris Faybishenko
  • Fred Molz
  • Deborah Agarwal
Conference paper
Part of the Springer Proceedings in Mathematics & Statistics book series (PROMS, volume 271)

Abstract

Modeling of ecological processes is demonstrated using a newly developed nonlinear dynamics model of microbial populations, consisting of a 4-variable system of coupled ordinary differential equations. The system also includes a modified version of the Monod kinetics equation. The model is designed to simulate the temporal behavior of a microbiological system containing a nutrient, two feeding microbes and a microbe predator. Three types of modeling scenarios were numerically simulated to assess the instability caused by (a) variations of the nutrient flux into the system, with fixed initial microbial concentrations and parameters, (b) variations in initial conditions, with fixed other parameters, and (c) variations in selected parameters. A modeling framework, using the high-level statistical computing languages MATLAB and R, was developed to conduct the time series analysis in the time domain and phase space. In the time domain, the Hurst exponent, the information measure–Shannon’s entropy, and the time delay of temporal oscillations of nutrient and microbe concentrations were calculated. In the phase domain, we calculated a set of diagnostic criteria of deterministic chaos: global and local embedding dimensions, correlation dimension, information dimension, and a spectrum of Lyapunov exponents. The time series data are used to plot the phase space attractors to express the dependence between the system’s state parameters, i.e., microbe concentrations, and pseudo-phase space attractors, in which the attractor axes are used to compare the observations from a single time series, which are separated by the time delay. Like classical Lorenz or Rossler systems of equations, which generate a deterministic chaotic behavior for a certain range of input parameters, the developed mathematical model generates a deterministic chaotic behavior for a particular set of input parameters. Even a slight variation of the system’s input data might result in vastly different predictions of the temporal oscillations of the system. As the nutrient influx increases, the system exhibits a sharp transition from a steady state to deterministic chaotic to quasi-periodic and again to steady state behavior. For small changes in initial conditions, resulting attractors are bounded (contrary to that of a random system), i.e., may represent a ‘sustainable state’ (i.e., resilience) of the ecological system.

Keywords

Nonlinear dynamics Deterministic chaos Microbial systems modeling Criteria of chaos Attractor 

Notes

Acknowledgements

BF and DA research supported by the U.S. DOE, Office of Science, Office of Biological and Environmental Research, and Office of Science, Office of Advanced Scientific Computing under the DOE Contract No. DE-AC02-05CH11231. FM acknowledges the support of the Clemson University, Department of Environmental Engineering and Earth Sciences. The invitation by Sergei Silvestrov and Dmitrii Silvestrov to present the paper at the SPAS2017 International Conference on Stochastic Processes and Algebraic Structures, and their kind assistance with LaTeX typesetting of the manuscript for publication are gratefully appreciated.

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Copyright information

© Springer Nature Switzerland AG 2018

Authors and Affiliations

  1. 1.Lawrence Berkeley National Laboratory, Energy Geosciences DivisionUniversity of CaliforniaBerkeleyUSA
  2. 2.Environmental Engineering and Earth Sciences DeptClemson UniversityAndersonUSA
  3. 3.Lawrence Berkeley National Laboratory, Computer Research DivisionUniversity of CaliforniaBerkeleyUSA

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