Academic Journal
Whole plastomes are not enough: phylogenomic and morphometric exploration at multiple demographic levels of the bee orchid clade Ophrys sect. Sphegodes
| العنوان: | Whole plastomes are not enough: phylogenomic and morphometric exploration at multiple demographic levels of the bee orchid clade Ophrys sect. Sphegodes |
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| المؤلفون: | Bateman, Richard M, Rudall, Paula J, Murphy, Alexander R M, Cowan, Robyn S, Devey, Dion S, Peréz-Escobar, Oscar A |
| المساهمون: | Melzer, Rainer, Botanical Society of Britain and Ireland |
| المصدر: | Journal of Experimental Botany ; volume 72, issue 2, page 654-681 ; ISSN 0022-0957 1460-2431 |
| بيانات النشر: | Oxford University Press (OUP) |
| سنة النشر: | 2021 |
| الوصف: | Plastid sequences have long dominated phylogeny reconstruction at all time depths, predicated on a usually untested assumption that they accurately represent the evolutionary histories of phenotypically circumscribed species. We combined detailed in situ morphometrics (124 plants) and whole-plastome sequencing through genome skimming (71 plants) in order to better understand species-level diversity and speciation in arguably the most challenging monophyletic group within the taxonomically controversial, pseudo-copulatory bee orchid genus Ophrys. Using trees and ordinations, we interpreted the data at four nested demographic levels—macrospecies, mesospecies, microspecies, and local population—seeking the optimal level for bona fide species. Neither morphological nor molecular discontinuities are evident at any level below macrospecies, the observed overlap among taxa suggesting that both mesospecies and microspecies reflect arbitrary division of a continuum of variation. Plastomes represent geographic location more strongly than taxonomic assignment and correlate poorly with morphology, suggesting widespread plastid capture and possibly post-glacial expansion from multiple southern refugia. As they are rarely directly involved in the speciation process, plastomes depend on extinction of intermediate lineages to provide phylogenetic signal and so cannot adequately document evolutionary radiations. The popular ‘ethological’ evolutionary model recognizes as numerous ‘ecological species’ (microspecies) lineages perceived as actively diverging as a result of density-dependent selection on very few features that immediately dictate extreme pollinator specificity. However, it is assumed rather than demonstrated that the many microspecies are genuinely diverging. We conversely envisage a complex four-dimensional reticulate network of lineages, generated locally and transiently through a wide spectrum of mechanisms, but each unlikely to maintain an independent evolutionary trajectory long enough to genuinely ... |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| DOI: | 10.1093/jxb/eraa467 |
| DOI: | 10.1093/jxb/eraa467/35878224/eraa467.pdf |
| الاتاحة: | https://doi.org/10.1093/jxb/eraa467 http://academic.oup.com/jxb/advance-article-pdf/doi/10.1093/jxb/eraa467/35878224/eraa467.pdf http://academic.oup.com/jxb/article-pdf/72/2/654/36178395/eraa467.pdf |
| Rights: | https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model |
| رقم الانضمام: | edsbas.547484A1 |
| قاعدة البيانات: | BASE |
| DOI: | 10.1093/jxb/eraa467 |
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