Population Uncertainty in Model Ecosystem: Analysis by Stochastic Differential Equation

Details Population Uncertainty in Model Ecosystem: Analysis by Stochastic Differential Equation Population Uncertainty in Model Ecosystem: Analysis by Stochastic Differential Equation

2008-07-04

arxiv.org/abs/0807.0673v1

Biology

Quantitative Biology

Populations and Evolution

16 pages, 4 figure, submitted to J. Phys. Soc. Jpn

Scientific paper

10.1143/JPSJ.77.093801

Perturbation experiments are carried out by contact process and its mean-field version. Here, the mortality rate is increased or decreased suddenly. It is known that the fluctuation enhancement (FE) occurs after the perturbation, where FE means a population uncertainty. In the present paper, we develop a new theory of stochastic differential equation. The agreement between the theory and the mean-field simulation is almost perfect. This theory enables us to find much stronger FE than reported previously. We discuss the population uncertainty in the recovering process of endangered species.

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