Early diversification dynamics in a highly successful insular plant taxon are consistent with the general dynamic model of oceanic island biogeography  

作　　者：Jay Edneil C.Olivar Frank Hauenschild Hannah J.Atkins Gemma L.C.Bramley Alexandra N.Muellner-Riehl 

机构地区：[1]Department of Molecular Evolution and Plant Systematics&Herbarium(Lz),Institute of Biology,Leipzig University,Johannisallee 21-23,Leipzig D-04103,Germany [2]Centre for Teacher Training and School Research,Leipzig University,Prager Str.38-40,Leipzig D-04317,Germany [3]Royal Botanic Garden Edinburgh,2oa Inverleith Row,Edinburgh EH35LR,UK [4]Royal Botanic Gardens Kew,Richmond,Surrey TW93AB,UK [5]German Centre for Integrative Biodiversity Research(iDiv)Halle-Jena-Leipzig,Puschstrasse 4,Leipzig D-04103,Germany

出　　处：《Journal of Systematics and Evolution》2024年第2期215-232,共18页植物分类学报（英文版）

基　　金：support from the SYNTHESYS Project(http://www.synthesys.info/),which is financed by the European Community Research Infrastructure Action under the FP7“Capacities”Program to J.E.C.O.,from an IAPT Research Grant to J.E.C.O.,the Deutscher Akademischer Austauschdienst(DAAD project no.9169087o);J.E.C.0.and A.N.M.-R.,and the Federal Ministry of Education and Research(BMBF project no.16GWo12oK)to A.N.M.-R.Open Access funding enabled and organized by Projekt DEAL.

摘　　要：The general dynamic model(GDM)of oceanic island biogeography views oceanic islands predominantly as sinks rather than sources of dispersing lineages.To test this,we conducted a biogeographic analysis of a highly successful insular plant taxon,Cyrtandra,and inferred the directionality of dispersal and founder events throughout the four biogeographical units of the Indo-Australian Archipelago(IAA),namely Sunda,Wallacea,Philippines,and Sahul.Sunda was recovered as the major source area,followed by Wallacea,a system of oceanic islands.The relatively high number of events originating from Wallacea is attributed to its central location in the IAA and its complex geological history selecting for increased dispersibility.We also tested if diversification dynamics in Cyrtandra follow predictions of adaptive radiation,which is the dominant process as per the GDM.Diversification dynamics of dispersing lineages of Cyrtandra in the Southeast Asian grade showed early bursts followed by a plateau,which is consistent with adaptive radiation.We did not detect signals of diversity-dependent diversification,and this is attributed to Southeast Asian cyrtandras occupying various niche spaces,evident by their wide morphological range in habit and floral characters.The Pacific clade,which arrived at the immaturity phase of the Pacific Islands,showed diversification dynamics predicted by the island immaturity speciation pulse model(sP),wherein rates increase exponentially,and their morphological range is controlled by the least action effect favoring woodiness and fleshy fruits.Our study provides a first step toward a framework for investigating diversification dynamics as predicted by the GDM in highly successful insular taxa.

关 键 词：Cyrtandra DIVERSIFICATION general dynamic model islands WALLACEA 

分 类 号：Q94[生物学—植物学]