
Species‐specific phylogeographical patterns and Pleistocene east–west divergence in Annona (Annonaceae) in the Brazilian Cerrado
Author(s) -
Correa Ribeiro Priciane,
LemosFilho José P.,
Oliveira Buzatti Renata S.,
Lovato Maria B.,
Heuertz Myriam
Publication year - 2016
Publication title -
botanical journal of the linnean society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.872
H-Index - 68
eISSN - 1095-8339
pISSN - 0024-4074
DOI - 10.1111/boj.12394
Subject(s) - refugium (fishkeeping) , biological dispersal , biology , genetic structure , phylogeography , biogeography , ecology , population , genetic divergence , allopatric speciation , genetic diversity , genetic variation , phylogenetic tree , biochemistry , demography , sociology , habitat , gene
The Brazilian Cerrado is the most diverse savanna in the world. Phylogeographical patterns for Cerrado tree species are relatively congruent; however, the causes of these patterns are not clear. Ours aims were to investigate phylogeographical patterns in two co‐distributed Annona spp. in the Cerrado and identify the factors responsible for their genetic structure. We sequenced non‐coding plastid DNA regions and estimated divergence times using a Bayesian Markov chain Monte Carlo method implemented in BEAST . Generalized linear mixed models ( GLMM s) were used to relate genetic divergence with spatial, climatic and phytogeographic data. Annona crassiflora possessed only one haplotype, whereas A. coriacea possessed nine haplotypes constituting two groups: western and eastern. Haplotype diversification first occurred in the Pliocene; the split between eastern and western groups was dated to the Early Pleistocene. GLMM s detected a weak association of genetic distance with current climatic factors, represented mainly by precipitation in the warmest months. In A. coriacea , the north of central Cerrado (around Serra Geral de Goiás) is suggested as a putative Pleistocene refugium. The current climate and dispersal and local adaptation processes probably contribute to maintaining the east–west genetic structure in A. coriacea . Both Annona spp. show idiosyncratic population histories, reminiscent of the complex biogeography of the Cerrado.