Effects of noise on some dynamical models in ecology

W. M. Schaffer, S. Ellner, M. Kot

Research output: Contribution to journalArticlepeer-review

75 Scopus citations


We investigate effects of random perturbations on the dynamics of one-dimensional maps (single species difference equations) and of finite dimensional flows (differential equations for n species). In particular, we study the effects of noise on the invariant measure, on the "correlation" dimension of the attractor, and on the possibility of detecting the nonlinear deterministic component by applying reconstruction techniques to the time series of population abundances. We conclude that adding noise to maps with a stable fixed-point obscures the underlying determinism. This turns out not to be the case for systems exhibiting complex periodic or chaotic motion, whose essential properties are more robust. In some cases, adding noise reveals deterministic structure which otherwise could not be observed. Simulations suggest that similar results hold for flows whose attractor is almost two-dimensional.

Original languageEnglish (US)
Pages (from-to)479-523
Number of pages45
JournalJournal of mathematical biology
Issue number5
StatePublished - Dec 1986


  • Chaos
  • Ecology
  • Noise
  • Nonlinear dynamics

ASJC Scopus subject areas

  • Modeling and Simulation
  • Agricultural and Biological Sciences (miscellaneous)
  • Applied Mathematics


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