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Incorporating interspecific interactions into phylogeographic models to infer the processes structuring genomic variation in a highly specialist grasshopper

AuthorsNoguerales, Víctor ; González-Serna, María José; Aparicio, José Miguel ; Cordero, Pedro J. ; Ortego, Joaquín
KeywordsClimatic fluctuations
Ecological niche models
Host-plant interactions
Landscape genomics
Issue Date2018
CitationIBS (2018)
AbstractQuaternary climatic oscillations have been recognized as a major factor shaping the distribution and demography of most organisms worldwide. A classical paradigm establishes that populations that have persisted in climatically stable areas harbor higher genetic variation than those located in climatically unstable and/or recently colonized regions. Nevertheless, climate-based models are not likely to accurately reflect distributional shifts and explain spatial patterns of genetic variation in highly specialist taxa with particular ecological requirements. Here, we incorporate interspecific interactions into phylogeographic models to infer the processes underlying the patterns of genetic variation in the scrub-legume grasshopper (Chorthippus binotatus), a highly specialist species that exclusively feeds on certain bush-legume plants (Genisteae). In a first step, we use current and past climate-based distributions inferred for both the grasshopper and all its host-plant species to build alternative phylogeographic models considering a different relative importance of the abiotic (climate, geography) and biotic (interspecific interactions) components of the landscape. In a second step, we employ genomic data (ddRADSeq) and perform spatially explicit coalescent-based simulations under each phylogeographic model to determine the one that is most supported by observed data, estimate demographic parameters, and infer the processes underlying spatial patterns of genetic variation in our study species. Our approach offers a valuable framework to test biologically informed models incorporating the importance of interspecific interactions, which can ultimately help to get more accurate inferences about the proximate causes shaping the evolutionary and demographic trajectories of organisms.
DescriptionResumen del trabajo presentado al International Biogeographical Society meeting: "Climate Change Biogeography", celebrado en Évora (Portugal) del 20 al 24 de marzo de 2018.
Appears in Collections:(IREC) Comunicaciones congresos
(EBD) Comunicaciones congresos
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