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Título

Spatial patterns in mesic savannas: The local facilitation limit and the role of demographic stochasticity

AutorMartínez-García, Ricardo ; Calabrese, Justin; López, Cristóbal
Palabras claveVegetation models
Nonlinear dynamics
Stochastic processes
Fecha de publicación21-sep-2013
EditorElsevier
CitaciónJournal of Theoretical Biology 333: 156-165 (2013)
ResumenWe propose a model equation for the dynamics of tree density in mesic savannas which considers long-range competition among trees and the effect of fire indirectly acting as a local facilitation mechanism. Despite the fact that we take short-range facilitation to the local-range limit, the standard full spectrum of spatial structures already obtained in self-organization models of vegetation is recovered. Nonlocal competition, in the limit of infinitesimally short facilitation, promotes the clustering of trees. The long time coexistence between trees and grass, and how fires affect the survival of trees as well as the maintenance of the patterns is studied. The influence of demographic noise is analyzed. The stochastic system, under the parameter constraints typical of mesic savannas, shows non-homogeneous patterns characteristic of realistic situations. The coexistence of trees and grass still remains at reasonable noise intensities. © 2013 Elsevier Ltd.
DescripciónarXiv:1209.5178
Versión del editorhttp://dx.doi.org/10.1016/j.jtbi.2013.05.024
URIhttp://hdl.handle.net/10261/116634
DOI10.1016/j.jtbi.2013.05.024
Identificadoresdoi: 10.1016/j.jtbi.2013.05.024
issn: 0022-5193
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