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Title of Journal: Oecologia

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Abbravation: Oecologia

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Springer Berlin Heidelberg

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DOI

10.1007/bf00260124

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1432-1939

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Assessing the impact of fire on the spatial distri

Authors: Andres FuentesRamirez Erika L Mudrak Petrutza C Caragea Claus Holzapfel Kirk A Moloney
Publish Date: 2015/01/06
Volume: 178, Issue: 2, Pages: 473-484
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Abstract

In southwestern American deserts fire has been historically uncommon because of insufficient continuity of fuel for spreading However deserts have been invaded by exotic species that now connect the empty space between shrubs to carry fire We hypothesized that fire would change the spatial distribution of surviving Larrea tridentata shrubs We established two study plots one each in a burned and unburned area and recorded location and living status of all shrubs We performed univariate and bivariate point pattern analyses to characterize the impact of fire on the overall distribution of shrubs Additionally we used a simple wildfire model to determine how close we could come to reconstructing the observed spatial pattern of living and dead shrubs We found a hyperdispersed pattern of shrubs at finer scales and a random pattern at broader scales for both the unburned plot and for the living and dead shrubs combined in the burned plot the latter providing an approximation of the preburn distribution of shrubs After fire living shrubs showed a clustered pattern at scales 25 m whereas dead shrubs were randomly distributed indicating that fire caused a change in the spatial pattern of the surviving shrubs The fire model was able to partially reconstruct the spatial pattern of Larrea but created a more clustered distribution for both living and dead shrubs Our study reinforces the key role of fire in altering landscapes that had not been habituated to fire and suggests the existence of potential cascading effects across the entire plant communityFunding was provided by the Department of Defense’s Strategic Environmental Research and Development Program SERDP USA Project RC1721 Holzapfel Moloney We thank Ruth Sparks David Housman Richard Whittle and Teresa Walker for logistical help and Carolyn Haines Jennifer Schafer Marjolein Schat and Hadas Parag for their help in the field We also thank two anonymous reviewers for comments and improvements on this manuscript AFR is supported by Becas Chile 2010 CONICYT Ministry of Education Chile This research complies with the current laws of the United States of America in which the study was performed

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