Intraspecific functional diversity in hosts and its effect on disease risk across a climatic gradient

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dc.contributor.authorGarrett, Karen A.en
dc.contributor.authorZuñiga, L. N.en
dc.contributor.authorRoncal, E.en
dc.contributor.authorForbes, Gregory Allanen
dc.contributor.authorMundt, C. C.en
dc.contributor.authorSu, Z.en
dc.contributor.authorNelson, R. J.en
dc.contributor.departmentSustainable Agriculture and Natural Resource Management (SANREM) Knowledgebaseen
dc.date.accessioned2016-04-19T20:07:00Zen
dc.date.available2016-04-19T20:07:00Zen
dc.date.issued2009en
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.en
dc.description.notesLTRA-4 (Practices and Strategies for Vulnerable Agro-Ecosystems)en
dc.format.mimetypeapplication/pdfen
dc.identifier4381en
dc.identifier.citationEcological Applications 19(7): 1868-1883en
dc.identifier.issn1051-0761en
dc.identifier.other4381_Intraspecific_Garrett_Zuniga.pdfen
dc.identifier.urihttp://hdl.handle.net/10919/68689en
dc.language.isoen_USen
dc.publisherEcological Society of Americaen
dc.rightsIn Copyrighten
dc.rights.holderCopyright 2009 by the Ecological Society of Americaen
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectAgroecologyen
dc.subjectDensity dependenceen
dc.subjectDisease ecologyen
dc.subjectFrequency dependenceen
dc.subjectFunctional diversityen
dc.subjectGenetic diversityen
dc.subjectGenetic diversityen
dc.subjectIntraspecific diversityen
dc.subjectPhytophthora infestansen
dc.subjectPlant pathologyen
dc.subjectPotato late blighten
dc.subjectSolanum tuberosumen
dc.subjectHost biodiversityen
dc.subjectPlant diseasesen
dc.subjectClimatic gradienten
dc.subjectEcosystemen
dc.titleIntraspecific functional diversity in hosts and its effect on disease risk across a climatic gradienten
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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