Topography drives microgeographic adaptations of closely related species in two tropical tree species complexes
SCHMITT, Sylvain
Ecologie des forêts de Guyane [UMR ECOFOG]
Biodiversité, Gènes & Communautés [BioGeCo]
Ecologie des forêts de Guyane [UMR ECOFOG]
Biodiversité, Gènes & Communautés [BioGeCo]
HÉRAULT, Bruno
Forêts et Sociétés [UPR Forêts et Sociétés]
Département Environnements et Sociétés [Cirad-ES]
See more >
Forêts et Sociétés [UPR Forêts et Sociétés]
Département Environnements et Sociétés [Cirad-ES]
SCHMITT, Sylvain
Ecologie des forêts de Guyane [UMR ECOFOG]
Biodiversité, Gènes & Communautés [BioGeCo]
Ecologie des forêts de Guyane [UMR ECOFOG]
Biodiversité, Gènes & Communautés [BioGeCo]
HÉRAULT, Bruno
Forêts et Sociétés [UPR Forêts et Sociétés]
Département Environnements et Sociétés [Cirad-ES]
< Reduce
Forêts et Sociétés [UPR Forêts et Sociétés]
Département Environnements et Sociétés [Cirad-ES]
Language
en
Article de revue
This item was published in
Molecular Ecology. 2021, vol. 30, n° 20, p. 5080-5093
Wiley
English Abstract
Closely related tree species that grow in sympatry are abundant in rainforests. However, little is known of the ecoevolutionary processes that govern their niches and local coexistence. We assessed genetic species delimitation ...Read more >
Closely related tree species that grow in sympatry are abundant in rainforests. However, little is known of the ecoevolutionary processes that govern their niches and local coexistence. We assessed genetic species delimitation in closely related sympatric species belonging to two Neotropical tree species complexes and investigated their genomic adaptation to a fine-scale topographic gradient with associated edaphic and hydrologic features. Combining LiDAR-derived topography, tree inventories, and single nucleotide polymorphisms (SNPs) from gene capture experiments, we explored genome-wide population genetic structure, covariation of environmental variables, and genotype-environment association to assess microgeographic adaptations to topography within the species complexes Symphonia (Clusiaceae), and Eschweilera (Lecythidaceae) with three species per complex and 385 and 257 individuals genotyped, respectively. Within species complexes, closely related tree species had different realized optima for topographic niches defined through the topographic wetness index or the relative elevation, and species displayed genetic signatures of adaptations to these niches. Symphonia species were genetically differentiated along water and nutrient distribution particularly in genes responding to water deprivation, whereas Eschweilera species were genetically differentiated according to soil chemistry. Our results suggest that varied topography represents a powerful driver of processes modulating tropical forest biodiversity with differential adaptations that stabilize local coexistence of closely related tree species.Read less <
English Keywords
ecological niche
French Guiana
relative elevation
species coexistence
syngameon
topographic wetness index
tropical forests
ANR Project
CEnter of the study of Biodiversity in Amazonia - ANR-10-LABX-0025
Origin
Hal imported