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Physics - Complexity | The Influence of Demographic Stochasticity on Population Dynamics - A Mathematical Study of Noise-Induced

The Influence of Demographic Stochasticity on Population Dynamics

A Mathematical Study of Noise-Induced Bistable States and Stochastic Patterns

Series: Springer Theses

Biancalani, Tommaso

2014, XVII, 113 p. 37 illus., 16 illus. in color.

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  • Nominated as an outstanding Ph.D. thesis by the University of Manchester, UK
  • Reviews the basic concepts of pattern instabilities
  • Introduces the novel explanatory concepts of noise-induced bistable states and stochastic patterns
  • Describes an improvement to the van Kampen expansion
The dynamics of population systems cannot be understood within the framework of ordinary differential equations, which assume that the number of interacting agents is infinite. With recent advances in ecology, biochemistry and genetics it is becoming increasingly clear that real systems are in fact subject to a great deal of noise. Relevant examples include social insects competing for resources, molecules undergoing chemical reactions in a cell and a pool of genomes subject to evolution. When the population size is small, novel macroscopic phenomena can arise, which can be analyzed using the theory of stochastic processes. This thesis is centered on two unsolved problems in population dynamics: the symmetry breaking observed in foraging populations, and the robustness of spatial patterns. We argue that these problems can be resolved with the help of two novel concepts: noise-induced bistable states and stochastic patterns.

Content Level » Research

Keywords » Fluctuation in Small Populations - Fokker-Planck Equation - Gillespie Algorithm - Noise-induced Bistability - Population Dynamics and Noise - Robustness of Spatial Patterns - Stochastic Patterns - Symmetry Breaking in Foraging Populations - Van Kampen Expansion

Related subjects » Biophysics & Biological Physics - Complexity - Ecology - Probability Theory and Stochastic Processes

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