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您的检索式：作者名="Virginia Valcarcel"
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| 1 | Chloroplast phylogenomic data support Eocene amphi-Pacific early radiation for the Asian Palmate core Araliaceae显示文摘Traditional phylogenies based on analysis of multiple genes have failed to obtain a well-resolved evolutionary history for the backbone of the Asian Palmate group of Araliaceae,the largest clade of the family.In this study,we applied the genome skimming approach of next-generation sequencing to address whether the lack of resolution at the base of the Asian Palmate tree is due to molecular sampling error or the footprint of ancient radiation.Twenty-nine complete plastid genomes of Araliaceae(17 newly sequenced)were analyzed(RAxML,Beast,Lagrange,and BioGeoBears)to provide the first phylogenomic reconstruction of the group(95%of genera included).As a result,the early divergences of the Asian Palmate group have been clarified but the backbone of its core is not totally resolved,with short internal branches pointing to an ancient radiation scenario.East Asia is inferred as the most likely ancestral area for the Asian Palmate group(from late Paleocene to Eocene)from which early colonization of the Neotropics is inferred during the Eocene.The radiation of the core Palmate group took place during the late Eocene,most likely in the context of the Boreotropical hypothesis.Recurrent episodes of southward migration(to the tropics)coupled with northern latitude local extinctions(promoting geographic isolation of lineages)followed by northward expansion(promoting contact of lineages that erased the trace of preceding geographic isolation)are hypothesized to have linked to the alternation of the cold and warm periods of the Eocene. | Virginia Valcarcel Jun Wen | 2019 | Journal of Systematics and Evolution2019，57，6： | 10 |
| 2 | Worldwide long-distance dispersal favored by epizoochorous traits in the biogeographic history of Omphalodeae (Boraginaceae)显示文摘Biogeographic dispersal is supported by numerous phylogenetic results.In particular,transoceanic dispersal,rather than vicariance,is suggested for some plant lineages despite current long distances between America and Europe.However,few studies on the biogeographic history of plants have also studied the role of diaspore syndromes in long-distance dispersal(LDD).Species of the tribe Omphalodeae(Boraginaceae)offer a suitable study system because the species have a wide variety of diaspore traits related to LDD and different lineages conform to patched worldwide distributions on three distant continents(Europe,America and New Zealand).Our aim is to reconstruct the biogeographical history of the Omphalodeae and to investigate the role of diaspore traits favoring LDD and current geographic distributions.To this end,a time-calibrated phylogeny with 29 of 32 species described for Omphalodeae was reconstructed using biogeographical analyses(BioGeoBEARS,Lagrange)and models(DEC and DIVA)under different scenarios of land connectivity.Character-state reconstruction(SIMMAP)and diversification rate estimations of the main lineages were also performed.The main result is that epizoochorous traits have been the ancestral state of LDD syndromes in most dades.An early diversification age of the tribe is inferred in the Western Mediterranean during late Oligocene.Colonization of the New World by Omphalodeae,followed by fast lineage differentiation,took place sometime in the Oligocene-Miocene boundary,as already inferred for other angiosperm genera.In contrast,colonization of remote islands(New Zealand,Juan Fernandez)occurred considerably later in the Miocene-Pliocene boundary. | Ana Otero Pedro Jimenez-Mejias Virginia Valcarcel Pablo Vargas | 2019 | Journal of Systematics and Evolution2019，57，6： | 3 |
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