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dc.contributor.authorGoldberg, Jay K.
dc.contributor.authorLively, Curtis M.
dc.contributor.authorSternlieb, Sonya R.
dc.contributor.authorPintel, Genevieve
dc.contributor.authorHare, J. Daniel
dc.contributor.authorMorrissey, Michael B.
dc.contributor.authorDelph, Lynda F.
dc.identifier.citationGoldberg , J K , Lively , C M , Sternlieb , S R , Pintel , G , Hare , J D , Morrissey , M B & Delph , L F 2020 , ' Herbivore-mediated negative frequency-dependent selection underlies a trichome dimorphism in nature ' , Evolution Letters , vol. Early View .
dc.identifier.otherPURE: 265731134
dc.identifier.otherPURE UUID: 935033ac-920e-428c-8fa3-77018128ae09
dc.identifier.otherRIS: urn:D472A8FE04A6EF5A84A724E3929A88D1
dc.identifier.otherWOS: 000506610700001
dc.identifier.otherScopus: 85103150022
dc.descriptionAuthors are grateful for funding provided by an NSF GRFP to J.K.G. (2015195769) and DEB‐1353970 to L.F.D.en
dc.description.abstractNegative frequency‐dependent selection (NFDS) has been shown to maintain polymorphism in a diverse array of traits. The action of NFDS has been confirmed through modeling, experimental approaches, and genetic analyses. In this study, we investigated NFDS in the wild using morph‐frequency changes spanning a 20‐year period from over 30 dimorphic populations of Datura wrightii. In these populations, plants either possess glandular (sticky) or non‐glandular (velvety) trichomes, and the ratio of these morphs varies substantially among populations. Our method provided evidence that NFDS, rather than drift or migration, is the primary force maintaining this dimorphism. Most populations that were initially dimorphic remained dimorphic, and the overall mean and variance in morph frequency did not change over time. Furthermore, morph‐frequency differences were not related to geographic distances. Together, these results indicate that neither directional selection, drift, or migration played a substantial role in determining morph frequencies. However, as predicted by negative frequency‐dependent selection, we found that the rare morph tended to increase in frequency, leading to a negative relationship between the change in the frequency of the sticky morph and its initial frequency. In addition, we found that morph‐frequency change over time was significantly correlated with the damage inflicted by two herbivores: Lema daturaphila and Tupiochoris notatus. The latter is a specialist on the sticky morph and damage by this herbivore was greatest when the sticky morph was common. The reverse was true for L. daturaphila, such that damage increased with the frequency of the velvety morph. These findings suggest that these herbivores contribute to balancing selection on the observed trichome dimorphism.
dc.relation.ispartofEvolution Lettersen
dc.rightsCopyright © 2020 The Author(s). Evolution Letters published by Wiley Periodicals, Inc. on behalf of Society for the Study of Evolution (SSE) and European Society for Evolutionary Biology (ESEB). This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.en
dc.subjectBalanced polymorphismen
dc.subjectDatura wrightiien
dc.subjectGlandular trichomesen
dc.subjectPlant–herbivore interactionsen
dc.subjectQH301 Biologyen
dc.titleHerbivore-mediated negative frequency-dependent selection underlies a trichome dimorphism in natureen
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews. School of Biologyen
dc.contributor.institutionUniversity of St Andrews. Centre for Biological Diversityen
dc.description.statusPeer revieweden

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