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dc.contributor.authorGarrett, Karen A.
dc.contributor.authorZuñiga, L.N.
dc.contributor.authorRoncal, E.
dc.contributor.authorForbes, G.A.
dc.contributor.authorMundt, C.C.
dc.contributor.authorSu, Z.
dc.contributor.authorNelson, R.J.
dc.date.accessioned2016-04-19T20:07:00Z
dc.date.available2016-04-19T20:07:00Z
dc.date.issued2009
dc.identifier4381
dc.identifier.citationEcological Applications 19(7): 1868-1883
dc.identifier.issn1051-0761
dc.identifier.other4381_Intraspecific_Garrett_Zuniga.pdf
dc.identifier.urihttp://hdl.handle.net/10919/68689
dc.description.abstractThe effects of host biodiversity on disease risk may vary greatly depending on host population structure and climatic conditions. Agricultural diseases such as potato late blight, caused by Phytophthora infestans, provide the opportunity to study the effects of intraspecific host diversity that is relatively well-defined in terms of disease resistance phenotypes and may have functional impacts on disease levels. When these systems are present across a climatic gradient, it is also possible to study how season length and conduciveness of the environment to disease may influence the effects of host diversity on disease risk. We developed a simple model of epidemic progress to evaluate the effects on disease risk of season length, environmental disease conduciveness, and host functional divergence for mixtures of a susceptible host and a host with some resistance. Differences in disease levels for the susceptible vs. resistant genotypes shifted over time, with the divergence in disease levels first increasing and then decreasing. Disease reductions from host diversity were greatest for high host divergence and combinations of environmental disease conduciveness and season length that led to moderate disease severity. We also compared the effects of host functional divergence on potato late-blight risk in Ecuador (long seasons), two sites in Peru (intermediate seasons) in El Niño and La Niña years, and the United States (short seasons). There was some evidence for greater disease risk reduction from host diversity where seasons were shorter, probably because of lower regional inoculum loads. There was strong evidence for greater disease reduction when host functional divergence was greater. These results indicate that consideration of season length, environmental conduciveness to disease, and host functional divergence can help to explain the variability in disease response to host diversity.
dc.format.mimetypeapplication/pdf
dc.language.isoen_US
dc.publisherEcological Society of America
dc.rightsCopyright 2009 by the Ecological Society of America
dc.subjectAgroecology
dc.subjectDensity dependence
dc.subjectDisease ecology
dc.subjectFrequency dependence
dc.subjectFunctional diversity
dc.subjectGenetic diversity
dc.subjectGenetic diversity
dc.subjectIntraspecific diversity
dc.subjectPhytophthora infestans
dc.subjectPlant pathology
dc.subjectPotato late blight
dc.subjectSolanum tuberosum
dc.subjectHost biodiversity
dc.subjectPlant diseases
dc.subjectClimatic gradient
dc.subjectEcosystem
dc.titleIntraspecific functional diversity in hosts and its effect on disease risk across a climatic gradient
dc.typeArticle - Refereed
dc.description.notesLTRA-4 (Practices and Strategies for Vulnerable Agro-Ecosystems)
dc.type.dcmitypeText


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