A Structured Threshold Model for Mountain Pine Beetle Outbreak |
| |
Authors: | Mark A Lewis William Nelson Cailin Xu |
| |
Institution: | (1) Department of Biological Sciences, University of Alberta, Edmonton, Alberta, Canada;(2) Department of Mathematical and Statistical Sciences, University of Alberta, Edmonton, Alberta, Canada;(3) Present address: Department of Biology, Queen’s University, Kingston, Ontario, Canada |
| |
Abstract: | A vigor-structured model for mountain pine beetle outbreak dynamics within a forest stand is proposed and analyzed. This model
explicitly tracks the changing vigor structure in the stand. All model parameters, other than beetle vigor preference, were
determined by fitting model components to empirical data. An abrupt threshold for tree mortality to beetle densities allows
for model simplification. Based on initial beetle density, model outcomes vary from decimation of the entire stand in a single
year, to inability of the beetles to infect any trees. An intermediate outcome involves an initial infestation which subsequently
dies out before the entire stand is killed. A model extension is proposed for dynamics of beetle aggregation. This involves
a stochastic formulation. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|