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dc.contributor.authorVázquez, Federico-
dc.contributor.authorLópez, Cristóbal-
dc.contributor.authorCalabrese, Justin-
dc.contributor.authorMuñoz, Miguel A.-
dc.date.accessioned2010-06-25T12:19:13Z-
dc.date.available2010-06-25T12:19:13Z-
dc.date.issued2010-05-21-
dc.identifier.citationJournal of Theoretical Biology 264(2): 360-366 (2010)en_US
dc.identifier.issn0022-5193-
dc.identifier.urihttp://hdl.handle.net/10261/25699-
dc.description8 pages, 7 figures.-- PDF pre-print.en_US
dc.description.abstractWe introduce the concept of dynamical phase coexistence to provide a simple solution for a long-standing problem in theoretical ecology, the so-called “savanna problem”. The challenge is to understand why in savanna ecosystems trees and grasses coexist in a robust way with large spatiotemporal variability. We propose a simple model, a variant of the contact process (CP), which includes two key extra features: varying external (environmental/rainfall) conditions and tree age. The system fluctuates locally between a woodland and a grassland phase, corresponding to the active and absorbing phases of the underlying pure contact process. This leads to a highly variable stable phase characterized by patches of the woodland and grassland phases coexisting dynamically. We show that the mean time to tree extinction under this model increases as a power-law of system size and can be of the order of 10,000,000 years in even moderately sized savannas. Finally, we demonstrate that while local interactions among trees may influence tree spatial distribution and the order of the transition between woodland and grassland phases, they do not affect dynamical coexistence. We expect dynamical coexistence to be relevant in other contexts in physics, biology or the social sciences.en_US
dc.description.sponsorshipF.V., C.L., and J.M.C. acknowledge support from NEST-Complexity project PATRES (043268). F.V. and C.L. acknowledge support from project FISICOS (FIS2007-60327) of MEC and FEDER. M.A.M. acknowledges financial support from the Spanish MICINN-FEDER under Project No. FIS2009-08451 and from Junta de Andalucía as group FQM-165.en_US
dc.format.extent847886 bytes-
dc.format.mimetypeapplication/pdf-
dc.language.isoengen_US
dc.publisherElsevieren_US
dc.rightsopenAccessen_US
dc.subjectSavannasen_US
dc.subjectDynamical coexistenceen_US
dc.subjectContact processen_US
dc.subjectStatistical physicsen_US
dc.subjectStochastic processesen_US
dc.titleDynamical phase coexistence: A simple solution to the “savanna problem”en_US
dc.typeartículoen_US
dc.identifier.doi10.1016/j.jtbi.2010.02.011-
dc.description.peerreviewedPeer revieweden_US
dc.relation.publisherversionhttp://dx.doi.org/10.1016/j.jtbi.2010.02.011en_US
dc.type.coarhttp://purl.org/coar/resource_type/c_6501es_ES
item.openairetypeartículo-
item.cerifentitytypePublications-
item.fulltextWith Fulltext-
item.languageiso639-1en-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.grantfulltextopen-
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