Demographical history and palaeodistribution modelling show range shift towards Amazon Basin for a Neotropical tree species in the LGM

BMC Evolutionary Biology

Research Article

Luciana Cristina Vitorino¹  Rosane G. Collevatti¹  Matheus S. Lima-Ribeiro²  Levi Carina Terribile² 

[1] Laboratório de Genética & Biodiversidade, Instituto de Ciências Biológicas, (ICB), Universidade Federal de Goiás (UFG), Cx.P. 131, 74001-970, Goiânia, GO, Brazil;Laboratório de Macroecologia, Universidade Federal de Goiás (UFG), Campus Jataí, Cx.P. 03, 75801-615, Jataí, GO, Brazil;

关键词: Bignoniaceae;    Dry forest refugia;    Ecological niche modelling;    Phylogeography;    Pleistocene arc hypothesis;    Quaternary climatic changes;   

DOI  :  10.1186/s12862-016-0779-9

 received in 2016-04-18, accepted in 2016-09-29,  发布年份 2016

来源: Springer

【 摘 要 】

BackgroundWe studied the phylogeography and demographical history of Tabebuia serratifolia (Bignoniaceae) to understand the disjunct geographical distribution of South American seasonally dry tropical forests (SDTFs). We specifically tested if the multiple and isolated patches of SDTFs are current climatic relicts of a widespread and continuously distributed dry forest during the last glacial maximum (LGM), the so called South American dry forest refugia hypothesis, using ecological niche modelling (ENM) and statistical phylogeography. We sampled 235 individuals of T. serratifolia in 17 populations in Brazil and analysed the polymorphisms at three intergenic chloroplast regions and ITS nuclear ribosomal DNA.ResultsCoalescent analyses showed a demographical expansion at the last c. 130 ka (thousand years before present). Simulations and ENM also showed that the current spatial pattern of genetic diversity is most likely due to a scenario of range expansion and range shift towards the Amazon Basin during the colder and arid climatic conditions associated with the LGM, matching the expected for the South American dry forest refugia hypothesis, although contrasting to the Pleistocene Arc hypothesis. Populations in more stable areas or with higher suitability through time showed higher genetic diversity. Postglacial range shift towards the Southeast and Atlantic coast may have led to spatial genome assortment due to leading edge colonization as the species tracks suitable environments, leading to lower genetic diversity in populations at higher distance from the distribution centroid at 21 ka.ConclusionHaplotype sharing or common ancestry among populations from Caatinga in Northeast Brazil, Atlantic Forest in Southeast and Cerrado biome and ENM evince the past connection among these biomes.

【 授权许可】

CC BY   
© The Author(s). 2016