CARON, Henri; MOLINO, Jean‐françois; SABATIER, Daniel; LÉGER, Patrick; CHAUMEIL, Philippe; SCOTTI-SAINTAGNE, Caroline; FRIGERIO, Jean-Marc; SCOTTI, Ivan; FRANC, Alain; PETIT, Rémy J.

doi:10.1002/ece3.5096

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CARON, Henri
Biodiversité, Gènes & Communautés [BioGeCo]
Ecologie des forêts de Guyane [UMR ECOFOG]

MOLINO, Jean‐françois
Botanique et Modélisation de l'Architecture des Plantes et des Végétations [UMR AMAP]

SABATIER, Daniel
Botanique et Modélisation de l'Architecture des Plantes et des Végétations [UMR AMAP]

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Article de revue

Ce document a été publié dans

Ecology and Evolution. 2019-04, vol. 9, n° 8, p. 4897-4905

Wiley Open Access

Résumé en anglais

We investigate chloroplast DNA variation in a hyperdiverse community of tropical rainforest trees in French Guiana, focusing on patterns of intraspecific and interspecific variation. We test whether a species genetic diversity is higher when it has congeners in the community with which it can exchange genes and if shared haplotypes are more frequent in genetically diverse species, as expected in the presence of introgression. We sampled a total of 1,681 individual trees from 472 species corresponding to 198 genera and sequenced them at a noncoding chloroplast DNA fragment. Polymorphism was more frequent in species that have congeneric species in the study site than in those without congeners (30% vs. 12%). Moreover, more chloroplast haplotypes were shared with congeners in polymorphic species than in monomorphic ones (44% vs. 28%). Despite large heterogeneities caused by genus-specific behaviors in patterns of hybridization, these results suggest that the higher polymorphism in the presence of congeners is caused by local introgression rather than by incomplete lineage sorting. Our findings suggest that introgression has the potential to drive intraspecific genetic diversity in species-rich tropical forests.< Réduire

Mots clés en anglais

Genetic diversity

Tropical trees

French Guiana

Hybridization

Incomplete lineage sorting

Introgression

DNA barcoding

Species diversity

Chloroplast DNA

DOI

http://dx.doi.org/10.1002/ece3.5096

Project ANR

CEnter of the study of Biodiversity in Amazonia - ANR-10-LABX-0025

Origine

Importé de hal

Unités de recherche

BioGeCo (Biodiversité Gènes & Communautés) - UMR 1202