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dc.contributor.author Ricard V. en_US
dc.contributor.author Javier en_US
dc.date.accessioned 2008-12-05T10:05:29Z
dc.date.available 2008-12-05T10:05:29Z
dc.date.issued 2002-04-21 en_US
dc.identifier http://dx.doi.org/10.1006/jtbi.2001.2520 en_US
dc.identifier.citation Sole , R V & Garcia-Perez Gamarra , J 2002 , ' Biomass-diversity responses and spatial dependencies in disturbed tallgrass prairies ' Journal of Theoretical Biology , pp. 469-480 . , 10.1006/jtbi.2001.2520 en_US
dc.identifier.other PURE: 90489 en_US
dc.identifier.other dspace: 2160/1401 en_US
dc.identifier.uri http://hdl.handle.net/2160/1401
dc.description.abstract Monotonic, hump-shaped and zero-correlation productivity–diversity relationships have been found to date in many ecosystems. This diversity of responses has puzzled ecologists in their search for general principles on ecosystem functioning. Some state that the scale of observation is crucial in defining this relationship. We have developed a spatial model of tallgrass prairies where biomass and litter dynamics are defined by uncoupled difference equations. In this system, we periodically apply prescribed fire as a disturbance that propagates through neighboring cells. The model shows percolation thresholds at points where small-scale spatial heterogeneity and large-scale, global correlation coexist, resulting in power-law distributions in available areas for non-dominant species. These points maximize the biomass–diversity relationship. Our results suggest that spatial dependencies and the disturbance heterogeneity hypothesis are the cornerstone processes accounting for unimodality in productivity–diversity relationships. en_US
dc.format.extent 12 en_US
dc.relation.ispartof Journal of Theoretical Biology en_US
dc.title Biomass-diversity responses and spatial dependencies in disturbed tallgrass prairies en_US
dc.contributor.pbl Aberystwyth University en_US
dc.contributor.pbl Institute of Biological, Environmental and Rural Sciences en_US


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