Recent origin and rapid speciation of Neotropical orchids in the world's richest plant biodiversity hotspot.

Détails

ID Serval
serval:BIB_9B0431F4A001
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Recent origin and rapid speciation of Neotropical orchids in the world's richest plant biodiversity hotspot.
Périodique
The New phytologist
Auteur(s)
Pérez-Escobar O.A., Chomicki G., Condamine F.L., Karremans A.P., Bogarín D., Matzke N.J., Silvestro D., Antonelli A.
ISSN
1469-8137 (Electronic)
ISSN-L
0028-646X
Statut éditorial
Publié
Date de publication
07/2017
Peer-reviewed
Oui
Volume
215
Numéro
2
Pages
891-905
Langue
anglais
Notes
Publication types: Journal Article
Publication Status: ppublish
Résumé
The Andean mountains of South America are the most species-rich biodiversity hotspot worldwide with c. 15% of the world's plant species, in only 1% of the world's land surface. Orchids are a key element of the Andean flora, and one of the most prominent components of the Neotropical epiphyte diversity, yet very little is known about their origin and diversification. We address this knowledge gap by inferring the biogeographical history and diversification dynamics of the two largest Neotropical orchid groups (Cymbidieae and Pleurothallidinae), using two unparalleled, densely sampled orchid phylogenies (including more than 400 newly generated DNA sequences), comparative phylogenetic methods, geological and biological datasets. We find that the majority of Andean orchid lineages only originated in the last 20-15 million yr. Andean lineages are derived from lowland Amazonian ancestors, with additional contributions from Central America and the Antilles. Species diversification is correlated with Andean orogeny, and multiple migrations and recolonizations across the Andes indicate that mountains do not constrain orchid dispersal over long timescales. Our study sheds new light on the timing and geography of a major Neotropical diversification, and suggests that mountain uplift promotes species diversification across all elevational zones.

Mots-clé
Biodiversity, Genetic Speciation, Orchidaceae/genetics, Orchidaceae/physiology, Phylogeny, Phylogeography, South America, Andes, Orchidaceae, biodiversity hotspots, biogeography, diversification, molecular clocks, mountain building, neotropics
Pubmed
Web of science
Open Access
Oui
Création de la notice
26/06/2017 8:57
Dernière modification de la notice
21/08/2019 6:34
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