Genetic diversity of Cedrela fissilis(Meliaceae)in the Brazilian Atlantic Forest reveals a complex phylogeographic history driven by Quaternary climatic fluctuations  

作　　者：Erica Mangaravite Thamyres C.da Silveira Alexander Huaman-Mera Luiz O.deOliveira Alexandra N.Muellner-Riehl Jan Schnitzler 

机构地区：[1]Laboratory for Molecular Biology and Phylogeography,Biochemistry Department,Federal University of Vicosa,Viqosa,Minas Gerais State,Brazil [2]Department of Biomedicine,Health Science Center,Centro Universitario Unifaminas,Av.Cristiano Ferreira Varella,655,Bairro Universitario,Muriae,Minas Gerais State,Brazil [3]Senckenberg Biodiversity and Climate Research Centre(SBiK-F),Frankfurt am Main,Germany [4]Faculty of Forestry and Environmental Engineering,National University of Jaen,250 Cuzco,Avenue,Jaen,Peru [5]Department of Molecular Evolution and Plant Systematics&Herbarium(LZ),Institute of Biology,Leipzig University,Leipzig,Germany [6]German Centre for Integrative Biodiversity Research(iDiv)Halle-Jena-Leipzig,Leipzig,Germany

出　　处：《Journal of Systematics and Evolution》2019年第6期655-669,共15页植物分类学报（英文版）

摘　　要：Quatemary climatic fluctuations have shaped the geographic distribution of lineages,potentially affecting the demography,genetic structure,and patterns of genetic diversity of extant species.Different phylogeographic scenarios have been proposed for plants in neotropical cloud forests during the Last Glacial Maximum based on paleoecological data:the dry refugia hypothesis(DRH)and the moist forest hypothesis.We specifially focus on the Brazilian Atlantic Forest(BAF)range of Cedrela fsiis(Meliaceae),sampling 410 specimens from 50 localities.Our study combines analyses of the genetic diversity,phylogeographic patterns,and past geographic distributions with a particular focus on highland populations.We identified 283 alleles across the 11 microsatellite loci,ranging from 18 to 33 alleles per locus,distributed across five genetic groups.Most populations of C fssiis from the BAF exhibited a diffuse genetic structure,reflected in low pairwise FsT values,which could be the consequence of high gene flow.In addition,the plastid data showed a connection between the westem,southem,and eastern populations in the North-East of Brazil,but no association between genetic data and elevation was observed.Habitat suitability projections over the past 140000 years showed less fragmentation relative to the present,indicating a higher connectivity and gene flow.Our results provide support for both the moist forest as well as the DRH,suggesting that most likely,a mixture of these processes has acted through space and time.

关 键 词：climate change genetic diversity habitat suitability micros atllite mountain phylogeography. 

分 类 号：X70[环境科学与工程—环境工程]