Genomic Differentiation during Speciation-with-Gene-Flow: Comparing Geographic and Host-Related Variation in Divergent Life History Adaptation in Rhagoletis pomonella

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dc.citation.articleNumber262en_US
dc.citation.issueNumber5en_US
dc.citation.journalTitleGenesen_US
dc.citation.volumeNumber9en_US
dc.contributor.authorDoellman, Meredith M.en_US
dc.contributor.authorRagland, Gregory J.en_US
dc.contributor.authorHood, Glen Rayen_US
dc.contributor.authorMeyers, Peter J.en_US
dc.contributor.authorEgan, Scott P.en_US
dc.contributor.authorPowell, Thomas H.Q.en_US
dc.contributor.authorLazorchak, Peteren_US
dc.contributor.authorGlover, Mary M.en_US
dc.contributor.authorTait, Cheyenneen_US
dc.contributor.authorSchuler, Hannesen_US
dc.contributor.authorHahn, Daniel A.en_US
dc.contributor.authorBerlocher, Stewart H.en_US
dc.contributor.authorSmith, James J.en_US
dc.contributor.authorNosil, Patriken_US
dc.contributor.authorFeder, Jeffrey L.en_US
dc.date.accessioned2018-08-21T16:18:47Zen_US
dc.date.available2018-08-21T16:18:47Zen_US
dc.date.issued2018en_US
dc.description.abstractA major goal of evolutionary biology is to understand how variation within populations gets partitioned into differences between reproductively isolated species. Here, we examine the degree to which diapause life history timing, a critical adaptation promoting population divergence, explains geographic and host-related genetic variation in ancestral hawthorn and recently derived apple-infesting races of Rhagoletis pomonella. Our strategy involved combining experiments on two different aspects of diapause (initial diapause intensity and adult eclosion time) with a geographic survey of genomic variation across four sites where apple and hawthorn flies co-occur from north to south in the Midwestern USA. The results demonstrated that the majority of the genome showing significant geographic and host-related variation can be accounted for by initial diapause intensity and eclosion time. Local genomic differences between sympatric apple and hawthorn flies were subsumed within broader geographic clines; allele frequency differences within the races across the Midwest were two to three-fold greater than those between the races in sympatry. As a result, sympatric apple and hawthorn populations displayed more limited genomic clustering compared to geographic populations within the races. The findings suggest that with reduced gene flow and increased selection on diapause equivalent to that seen between geographic sites, the host races may be recognized as different genotypic entities in sympatry, and perhaps species, a hypothesis requiring future genomic analysis of related sibling species to R. pomonella to test. Our findings concerning the way selection and geography interplay could be of broad significance for many cases of earlier stages of divergence-with-gene flow, including (1) where only modest increases in geographic isolation and the strength of selection may greatly impact genetic coupling and (2) the dynamics of how spatial and temporal standing variation is extracted by selection to generate differences between new and discrete units of biodiversity.en_US
dc.identifier.citationDoellman, Meredith M., Ragland, Gregory J., Hood, Glen Ray, et al.. "Genomic Differentiation during Speciation-with-Gene-Flow: Comparing Geographic and Host-Related Variation in Divergent Life History Adaptation in Rhagoletis pomonella." <i>Genes,</i> 9, no. 5 (2018) MDPI: https://doi.org/10.3390/genes9050262.en_US
dc.identifier.digitalgenes-09-00262en_US
dc.identifier.doihttps://doi.org/10.3390/genes9050262en_US
dc.identifier.urihttps://hdl.handle.net/1911/102486en_US
dc.language.isoengen_US
dc.publisherMDPIen_US
dc.rightsThis is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).en_US
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en_US
dc.subject.keywordapple maggot flyen_US
dc.subject.keywordeclosion timeen_US
dc.subject.keywordinitial diapause depthen_US
dc.subject.keywordlatitudinal clinesen_US
dc.titleGenomic Differentiation during Speciation-with-Gene-Flow: Comparing Geographic and Host-Related Variation in Divergent Life History Adaptation in Rhagoletis pomonellaen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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