toggle visibility Search & Display Options

Select All    Deselect All
 |   | 
  Record Links
Author (up) Audigeos, D.; Brousseau, L.; Traissac, S.; Scotti-Saintagne, C.; Scotti, I. url  doi
  Title Molecular divergence in tropical tree populations occupying environmental mosaics Type Journal Article
  Year 2013 Publication Journal of Evolutionary Biology Abbreviated Journal  
  Volume 26 Issue 3 Pages 529-544  
  Keywords Candidate genes; Drought; Eperua falcata; Flooding; Neotropics; Outlier loci; Tree genetics  
  Abstract Unveiling the genetic basis of local adaptation to environmental variation is a major goal in molecular ecology. In rugged landscapes characterized by environmental mosaics, living populations and communities can experience steep ecological gradients over very short geographical distances. In lowland tropical forests, interspecific divergence in edaphic specialization (for seasonally flooded bottomlands and seasonally dry terra firme soils) has been proven by ecological studies on adaptive traits. Some species are nevertheless capable of covering the entire span of the gradient; intraspecific variation for adaptation to contrasting conditions may explain the distribution of such ecological generalists. We investigated whether local divergence happens at small spatial scales in two stands of Eperua falcata (Fabaceae), a widespread tree species of the Guiana Shield. We investigated Single Nucleotide Polymorphisms (SNP) and sequence divergence as well as spatial genetic structure (SGS) at four genes putatively involved in stress response and three genes with unknown function. Significant genetic differentiation was observed among sub-populations within stands, and eight SNP loci showed patterns compatible with disruptive selection. SGS analysis showed genetic turnover along the gradients at three loci, and at least one haplotype was found to be in repulsion with one habitat. Taken together, these results suggest genetic differentiation at small spatial scale in spite of gene flow. We hypothesize that heterogeneous environments may cause molecular divergence, possibly associated to local adaptation in E. falcata. © 2012 European Society For Evolutionary Biology.  
  Address AgroParisTech-ENGREF, UMR 0745, EcoFoG ('Ecologie des forêts de Guyane'), Campus Agronomique, Kourou, French Guiana, France  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes Export Date: 28 February 2013; Source: Scopus Approved no  
  Call Number EcoFoG @ webmaster @ Serial 472  
Permanent link to this record
Select All    Deselect All
 |   | 

Save Citations:
Export Records: