Phylogenetic diversity and regionalization in the temperate arid zone  

作　　者：Ryan A.Folk Aliasghar A.Maassoumi Carolina M.Siniscalchi Heather R.Kates Douglas E.Soltis Pamela S.Soltis Michael B.Belitz Robert P.Guralnick 

机构地区：[1]Department of Biological Sciences,Mississippi State University,219 Harned Hall,Mississippi State,MS 39762,USA [2]Research Institute of Forests and Rangelands,Tehran,Tehran,Iran [3]University Libraries,Mississippi State University,395 Hardy Rd,Mississippi State,MS 39762,USA [4]Florida Museum of Natural History,University of Florida,1659 Museum Road,Gainesville,FL 32611,USA [5]Department of Biology,University of Florida,876 Newell Dr,Gainesville,FL 32611,USA [6]Genetics Institute,University of Florida,2033 Mowry Rd,Gainesville,FL 32610,USA [7]Biodiversity Institute,University of Florida,432 Newell Dr,Gainesville,FL 32603,USA

出　　处：《Journal of Systematics and Evolution》2024年第6期1201-1217,共17页植物分类学报（英文版）

基　　金：supported by the National Science Foundation(USA),grant number DEB-1916632;the Department ofEnergy(DOE),grant number DE-SC0018247.

摘　　要：Astragalus (Fabaceae) is astoundingly diverse in temperate, cold arid regions of Earth, positioning this group as a model clade for investigating the distribution of plant diversity in the face of environmental challenges. Here, we identify the spatial distribution of diversity and endemism in Astragalus using species distribution models for 752 species and a phylogenetic tree comprising 847 species. We integrated these to map centers of species richness (SR) and relative phylogenetic diversity (RPD) and used randomization approaches to investigate centers of endemism. We also used clustering methods to identify phylogenetic regionalizations. We then assembled predictor variables of current climate conditions to test environmental factors predicting these phylogenetic diversity results, especially temperature and precipitation seasonality. We find that SR centers are distributed globally at temperate middle latitudes in arid regions, but the Mediterranean Basin is the most important center of RPD. Endemism centers also occur globally, but Iran represents a key endemic area with a concentration of both paleo- and neoendemism. Phylogenetic regionalization recovered an east-west gradient in Eurasia and an amphitropical disjunction across North and South America;American phyloregions are overall most closely related to east and central Asia. SR, RPD, and lineage turnover are driven mostly by precipitation and seasonality, but endemism is driven primarily by diurnal temperature variation. Endemism and regionalization results point to western Asia and especially Iran as a biogeographic gateway between Europe and Asia. RPD and endemism highlight the importance of temperature and drought stress in determining plant diversity and endemism centers.

关 键 词：ASTRAGALUS BIOGEOGRAPHY CANAPE Iran phyloregion spatial phylogenetics 

分 类 号：Q94[生物学—植物学]