期刊
ECOLOGICAL COMPLEXITY
卷 5, 期 3, 页码 238-251出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ecocom.2008.01.002
关键词
community-driven dispersal; spatial model; predator-prey dynamics; individual-based modeling; spatiotemporal patterns
类别
资金
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- le Fond Quebecois de la Recherche sur la Nature et les Technologies
- U.S. National Science Foundation [DMR-0240078, DMR-0444051]
We present a spatial, individual-based predator-prey model in which dispersal is dependent on the local community. We determine species suitability to the biotic conditions of their local environment through a time and space varying fitness measure. Dispersal of individuals to nearby communities occurs whenever their fitness falls below a predefined tolerance threshold. The spatiotemporal dynamics of the model is described in terms of this threshold. We compare this dynamics with the one obtained through density-independent dispersal and find marked differences. In the community-driven scenario, the spatial correlations in the population density do not vary in a linear fashion as we increase the tolerance threshold. Instead we find the system to cross different dynamical regimes as the threshold is raised. Spatial patterns evolve from disordered, to scale-free complex patterns, to finally becoming well-organized domains. This model therefore predicts that natural populations, the dispersal strategies of which are likely to be influenced by their local environment, might be subject to complex spatiotemporal dynamics. (c) 2008 Elsevier B.V. All rights reserved.
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