An Allee effect reduces the invasive potential of Tilletia indica

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Show simple item record Bowden, Robert L. Garrett, Karen A. 2012-06-04T17:58:39Z 2012-06-04T17:58:39Z 2012-06-04
dc.description.abstract The Karnal bunt pathogen, Tilletia indica, is heterothallic and depends on encounters on wheat spikes between airborne secondary sporidia of different mating types for successful infection and reproduction. This life history characteristic results in reduced reproductive success for lower population densities. Such destabilizing density dependence at low population levels has been described for a range of animals and plants and is often termed an Allee effect. Our objective was to characterize how the Allee effect might reduce the invasive potential of this economically important pathogen. We developed a simple population model of T. indica that incorporates an Allee effect by calculating the probability of infection for different numbers of secondary sporidia in the infection court. An Allee effect is predicted to be important at the frontier of an invasion, for establishment of new foci by a small population of teliospores, and when the environment is nonconducive for the production of secondary sporidia. Using estimated model parameter values, we demonstrated a theoretical threshold population size below which populations of T. indica were predicted to decline rather than increase. This threshold will vary from season to season as a function of weather variables and their effect on the reproductive potential of T. indica. Deployment of partial resistance or use of fungicides may be more useful if they push population levels below this threshold. en_US
dc.relation.uri en_US
dc.subject Allee effect en_US
dc.subject Tilletia indica en_US
dc.subject Minimum viable population en_US
dc.subject Partial bunt en_US
dc.subject Spore bank en_US
dc.subject Threshold criteria en_US
dc.subject Depensation en_US
dc.subject Invasive species en_US
dc.title An Allee effect reduces the invasive potential of Tilletia indica en_US
dc.type Article (publisher version) en_US 2002 en_US
dc.citation.doi doi:10.1094/PHYTO.2002.92.11.1152 en_US
dc.citation.epage 1159 en_US
dc.citation.issue 11 en_US
dc.citation.jtitle Phytopathology en_US
dc.citation.spage 1152 en_US
dc.citation.volume 92 en_US
dc.contributor.authoreid kgarrett en_US
dc.contributor.authoreid rbowden en_US

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