Worldwide long-distance dispersal favored by epizoochorous traits in the biogeographic history of Omphalodeae (Boraginaceae)  

作　　者：Ana Otero Pedro Jimenez-Mejias Virginia Valcarcel Pablo Vargas 

机构地区：[1]Departamento de Biodiversidad,Real Jardin Botanico,CSIC.Pza.de Murillo,2,Madrid 28014,Spain [2]Escuela Intemacional de Doctorado,Universidad Rey Juan Carlos,C/Tulipan s/n,Mostoles 28933,Spain [3]Centro de Investigacion en Biodiversidad y Cambio Global(CIBC-UAM),Universidad Autonoma de Madrid,Madrid 28049,Spain [4]Departamento de Biologia(Botanica),Universidad Autonoma de Madrid,C/Darwin,2,Madrid 28049,Spain

出　　处：《Journal of Systematics and Evolution》2019年第6期579-593,共15页植物分类学报（英文版）

摘　　要：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.

关 键 词：COLONIZATION DIVERSIFICATION intercontinental disjunction molecular dating SYNDROMES Zealandia 

分 类 号：TG1[金属学及工艺—金属学]