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A coupled phylogeographical and species distribution modelling approach recovers the demographical history of a N eotropical seasonally dry forest tree species
Author(s) -
Collevatti Rosane G.,
Terribile Levi Carina,
LimaRibeiro Matheus S.,
Nabout João C.,
Oliveira Guilherme,
Rangel Thiago F.,
Rabelo Suelen G.,
DinizFilho Jose A. F.
Publication year - 2012
Publication title -
molecular ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.619
H-Index - 225
eISSN - 1365-294X
pISSN - 0962-1083
DOI - 10.1111/mec.12071
Subject(s) - coalescent theory , biology , disjunct , phylogeography , population , ecology , phylogenetic tree , demographic history , disjunct distribution , evolutionary biology , lineage (genetic) , isolation by distance , gene flow , genetic variation , genetics , demography , sociology , gene
We investigated here the demographical history of T abebuia impetiginosa ( B ignoniaceae) to understand the dynamics of the disjunct geographical distribution of S outh A merican seasonally dry forests ( SDF s), based on coupling an ensemble approach encompassing hindcasting species distribution modelling and statistical phylogeographical analysis. We sampled 17 populations (280 individuals) in central B razil and analysed the polymorphisms at chloroplast ( trn S ‐trn G , psb A ‐trn H , and ycf6‐trn C intergenic spacers) and nuclear ( ITS nr DNA ) genomes. Phylogenetic analyses based on median‐joining network showed no haplotype sharing among population but strong evidence of incomplete lineage sorting. Coalescent analyses showed historical constant populations size, negligible gene flow among populations, and an ancient time to most recent common ancestor dated from ~4.7 ± 1.1 Myr BP. Most divergences dated from the L ower P leistocene, and no signal of important population size reduction was found in coalescent tree and tests of demographical expansion. Demographical scenarios were built based on past geographical range dynamic models, using two a priori biogeographical hypotheses (‘ P leistocene A rc’ and ‘ A mazonian SDF expansion’) and on two additional hypotheses suggested by the palaeodistribution modelling built with several algorithms for distribution modelling and palaeoclimatic data. The simulation of these demographical scenarios showed that the pattern of diversity found so far for T . impetiginosa is in consonance with a palaeodistribution expansion during the last glacial maximum ( LGM , 21 kyr BP), strongly suggesting that the current disjunct distribution of T. impetiginosa in SDF s may represent a climatic relict of a once more wide distribution.